COMPOSITION

BACKGROUND TECHNICAL FIELD

The following is directed to abrasive articles, and particularly, bonded abrasive articles comprising abrasive particles comprising a composite composition.

BACKGROUND ART

Abrasive wheels are typically used for cutting, abrading, and shaping of various materials, such as stone, metal, glass, plastics, among other materials. Generally, the abrasive wheels can have various phases of materials including abrasive grains, a bonding agent, and some porosity. Depending upon the intended application, the abrasive wheel can have various designs and configurations. For example, for applications directed to the grinding of workpieces, some abrasive wheels are fashioned such that they have a relative thicker profile for efficient grinding.

However, given the application of such wheels, the abrasive articles are subject to fatigue and failure. In fact, the wheels may have a limited time of use of less than a day depending upon the frequency of use. Accordingly, the industry continues to demand abrasive wheels capable of improved performance.

SUMMARY

Embodiments of an abrasive article can include a body including an abrasive portion having a bond material, abrasive particles contained in the bond material, and a reinforcing member contained in the body. The abrasive portion can have a fracture propagation toughness WOF of at least about 5 kJ/m ² . The reinforcing member can have openings with an open area of not greater than about 100 mm ² within a major plane of the reinforcing member.

In some embodiments, an abrasive article can include a body including an abrasive portion having a bond material, abrasive particles contained in the bond material, and a reinforcing member contained in the body. The body can have an adhesion of at least about 1700 lbf, and an Adhesion Variance Factor (AVF) of not greater than about 10%.

In still other embodiments, an abrasive article can include a body including an abrasive portion having a bond material, abrasive particles contained in the bond material, a first filler contained within the abrasive portion comprising iron and sulfur having an average particle size of not greater than about 40 microns, and a reinforcing member contained in the body. The reinforcing member can include a greige weight (or uncoated weight) of not greater than about 950 g/m ² ; and/or a thickness of not greater than about 2 mm; and/or fiber bundles with the openings therebetween, and one fiber bundle and one opening have a combined dimension defined as a unit cell (UC) of not greater than about 15 mm; and/or openings with an open area of not greater than about 100 mm ² BRIEF DESCRIPTION OF DRAWINGS

The present disclosure may be better understood, and its numerous features and advantages made apparent to those skilled in the art by referencing the accompanying drawings.

FIG. 1 includes a schematic side view of an abrasive tool in accordance with an embodiment. FIG. 2 includes a schematic sectional radial view of a portion of an abrasive tool in accordance with an embodiment.

FIG. 3 includes a schematic, sectional radial view of a portion of an abrasive tool in accordance with another embodiment.

FIGS. 4 A and 4B include plan views of embodiments of a reinforcing member and, FIG. 4C includes a table of various dimensions of conventional reinforcing members and embodiments of a reinforcing member.

FIG. 5 includes plots of adhesion performance of abrasive articles in accordance with an embodiment and various conventional abrasive articles.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

The abrasive tools may utilize abrasive portions of abrasive grains contained within a matrix material for grinding, abrading, and finishing of workpieces. Certain embodiments herein are directed to abrasive grinding wheels incorporating one or more reinforcing members within the body of the tool that are particularly suited for grinding and/or shaping metal. The abrasive article can be configured to operate at a speed of at least about 10,000 sfpm, at least about 11,000 sfpm, or even at least about 12,000 sfpm.

FIG. 1 includes an illustration of an abrasive tool in accordance with an embodiment.

Notably, the abrasive tool 100 includes a body 101 having a generally circular shape as viewed in two dimensions. It will be appreciated, that in three dimensions the tool has a certain thickness such that the body 101 has a disk-like or a cylindrical shape. As illustrated, the body can have an outer diameter 103 extending through the center of the tool, which can be particularly large, having a dimension of at least about 20 cm. In other applications, the body 101 can have an outer diameter 103, such as on the order of at least about 30 cm, at least about 40 cm, at least about 50 cm, at least about 60 cm, at least about 70 cm, at least about 80 cm, or even at least 90 cm. Embodiments of the outer diameter 103 may be not greater than about 120 cm, such as not greater than about 110 cm, not greater than about 100 cm, not greater than about 90 cm, or even not greater than about 80 cm.

Particular abrasive tools utilize a body 101 having an outer diameter 103 within a range of any of the previous minimum and maximum values.

As further illustrated, the abrasive tool 100 can include a central opening 105 defined by an inner circular surface 102 about the center of the body 101. The central opening 105 can extend through the entire thickness of the body 101 such that the abrasive tool 100 can be mounted on a spindle or other machine for rotation of the abrasive tool 100 during operation. FIG. 2 includes a sectional illustration of a portion of an abrasive tool in accordance with an embodiment. The abrasive body 201 can be a composite article including a combination of portions of different types of material. In particular, the body 201 can include abrasive portions 204, 206, 208, and 210 and reinforcing members 205, 207, and 209. The abrasive tool 200 can be designed such that the reinforcing members 205, 207, and 209 can be placed within the body such that they are spaced apart from each other, and therein, separate each of the abrasive portions 204, 206, 208, and 210 from each other. That is, the abrasive tool 200 can be formed such that the reinforcing members 205, 207, and 209 are spaced apart from each other laterally through the thickness 212 of the body 201 and separated by abrasive portions 206 and 208. As will be appreciated, in such a design the abrasive portions 206 and 208 can be disposed between the reinforcing members 205, 207, and 209.

As further illustrated, the reinforcing members 205, 207, and 209 can be substantially planar members having first planar faces and second planar faces. For example, the reinforcing member 205 can be formed such that it is a planar member having a first major surface 215 and a second major surface 216. Moreover, the body 201 can have a design such that the abrasive portions 204, 206, 208, and 210 can overlie the major surface of the reinforcing members 205, 207, and 209. For example, the abrasive portion 204 can overlie the first major surface 215 of the reinforcing member 205 and the abrasive portion 206 overlies the second major surface 216 of the reinforcing member 205. In particular instances, the body 201 can be formed such that the abrasive portions 204 and 206 cover essentially the entire surface area of the first major surface 215 and second major surface 216, respectively. Accordingly, the abrasive portions 204 and 206 can directly contact (i.e. abut) the reinforcing member 205 on either sides at the first and second major surfaces 215 and 216.

Notably, the abrasive body 201 can be designed such that the reinforcing members 205, 207, and 209 can extend through a majority of the diameter 103 of the body 201. In particular instances, the reinforcing members 205, 207, and 209 can be formed such that they extend through at least about 75%, such as at least about 80%, or even the entire diameter 103 of the body 201.

As shown in the embodiment of FIG. 3, the reinforcing members 303, 305 may vary in length and position throughout an abrasive body 301. For example, the abrasive body 301 may comprise one or more relatively shorter reinforcing members 303 (e.g., six shown), as well as one or more relatively longer reinforcing members 305 (e.g., four shown). Embodiments of members 303 may extend only through an outer section 311 of the abrasive body 301, but not an inner section 313. Embodiments of members 305 may extend through the entire diameter of the abrasive body 301, such as outer section 311 and inner section 313. These reinforcing members 303, 305 also may be arranged axially with respect to central axis 350 in a variety of patterns. For example, as depicted in FIG. 3, two members 303 may be located between adjacent members 305. Metallic reinforcement rings 355 also may be provided in inner section 313. As stated herein, the number of reinforcing members may vary depending on the application. For example, the abrasive body may have 1 to 15 reinforcing members in some embodiments. In other embodiments, the abrasive body may have at least 2 reinforcing members, such as at least 4 reinforcing members, at least 6 reinforcing members, at least 8 reinforcing members, or even at least 10 reinforcing members. In other examples, the abrasive body may have not greater than 14 reinforcing members, such as not greater than 12 reinforcing members, not greater than 10 reinforcing members, or even not greater than 8 reinforcing members. The number of reinforcing members may be in a range between any of the foregoing values.

In accordance with the embodiment of FIG. 2, the body 201 may be formed such that it can have an average thickness 212 measured in a direction parallel to the axis 250 extending through the center of the central opening 105. The average thickness 212 of the body 201 can be at least about 3 cm, such as at least about 5 cm, at least about 7 cm, at least about 9 cm, or even at least about 11 cm. In other embodiments, the average thickness 212 can be not greater than about 18 cm, such as not greater than about 16 cm, not greater than about 14 cm, not greater than about 12 cm, or even not greater than about 10 cm. Still, certain embodiments may utilize an average thickness 212 within a range between any of the minimum and maximum values described above.

The disk also may have an aspect ratio defined as an outer diameter OD to axial thickness AT (OD:AT) of at least about 2, such as at least about 5, at least about 7, at least about 10, or even at least about 20. In other embodiments, the aspect ratio may be not greater than about 40, such as not greater than about 30, not greater than about 20, not greater than about 15, or even not greater than about 10. Certain embodiments may utilize an aspect ratio within a range between any of the minimum and maximum values given above.

In further reference to the reinforcing members 205, 207, and 209, such members can be made of an organic material, inorganic material, and a combination thereof. For example, the reinforcing members 205, 207, and 209 can be made of an inorganic material, such as a ceramic, a glass, quartz, or a combination thereof. Particularly suitable materials for use as the reinforcing members 205, 207, and 209 can include glass materials, incorporating fibers of glass materials, which may include oxide 4?ased glass materials.

Some suitable organic materials for use in the reinforcing members 205, 207, and 209 can include phenolic resin, polyimides, polyamides, polyesters, aramids, and a combination thereof. For example, in one particular embodiment, the reinforcing members 205, 207, and 209 can include Kevlar™, a particular type of aramid. Moreover, embodiments of the reinforcing member may comprise a phenolic resn based binder.

The reinforcing members 205, 207, and 209 can include a plurality of fibers that are woven together. The fibers can be woven or stitched together in a variety of manners. In certain instances, the reinforcing members can be woven together such that a pattern is formed, including fibers extending primarily in two perpendicular directions.

The reinforcing members 205, 207, and 209 can have a maximum thickness 218 that is defined as the distance between the first major surface 215 and the second major surface 216 of the reinforcing member 205. The maximum thickness 218 of each reinforcing member can be at least about 1 mm, such as at least about 1.1 mm, at least about 1.2 mm, or even at least about 1.3 mm. In other embodiments, the maximum thickness 218 can be not greater than about 2 mm, such as not greater than about 1.8 mm, not greater than about 1.5 mm, or even not greater than about 1.4 mm. Certain embodiments may utilize a thickness within a range between any of the minimum and maximum values given above.

In relative percentages, depending upon the design of the abrasive article, the reinforcing members can be formed to have certain dimensions such that they compose a certain percentage of the total average thickness of the body. For example, the reinforcing members can be at least about 3 vol of the total volume of the body 201. In other instances, the reinforcing member 205 can be at least about 5 vol , such as at least about 7 vol , or even at least about 9 vol of the total volume of the body 201. In still other embodiments, the reinforcing members can be not greater than about 17 vol of the total volume of the body, such as not greater than about 15 vol . Certain embodiments of the abrasive article can have reinforcing members within a range between the minimum and maximum values given above.

In some embodiments, a volumetric ratio of the abrasive portion to the reinforcing members is at least about 5, such as at least about 10, or even at least about 15. Other embodiments have a volumetric ratio of not greater than about 20, such as not greater than about 15, or even not greater than about 10. Certain embodiments of the abrasive article can have reinforcing members within a range between the minimum and maximum values given above.

In accordance with embodiments herein, the abrasive tool 200 is formed such that the body

201 includes abrasive portions 204, 206, 208, and 210. Reference will be made in the following paragraphs to the abrasive portion 204, however it will be appreciated that all of the identified abrasive portions can include the same features. The abrasive portion 204 can be a composite material having abrasive grains contained within a matrix material and further comprising a particular composition and type of porosity.

The abrasive grains can include a particularly hard material suitable for abrading and material removal applications. For example, the abrasive grains can have a Vickers hardness of at least about 5 GPa. The hardness of the abrasive grains can be greater in some tools, such that the abrasive grains have a Vickers hardness of at least about 10 GPa, at least about 20 GPa, at least about 30 GPa, or even at least about 50 GPa. As further illustrated in FIG. 2, the body can be formed such that it incorporates reinforcing members 202 and 203 that abut the outer surfaces of the abrasive portions 204 and 210 about the central opening 105. In certain designs, the reinforcing members 202 and 203 can extend for a portion of the outer diameter 103, such as half the outer diameter 103 of the abrasive body 201.

Provision of the reinforcing members 202 and 203 about the central opening 105 facilitates reinforcement of the body 201 at a location where the abrasive tool 200 is intended to be affixed to a spindle or machine. As will be appreciated, the reinforcing members 202 and 203 can have the same features as the reinforcing members 205, 207, and 209.

Embodiments of the body of the abrasive article may comprise a reinforcing member, such as a first reinforcing member. The first reinforcing member may abut the abrasive portion. The first reinforcing member may be disposed within the abrasive portion. Alternatively, the first reinforcing member may define an external surface of the body. In addition, the first reinforcing member may be disposed internally within the body.

Some embodiments of the first reinforcing member may comprise an organic material. In particular embodiments, the first reinforcing member may comprise a polyimide, polyamide, polyester, aramid, and a combination thereof. Alternatively, the first reinforcing member may comprise an inorganic material. For example, the inorganic material may comprise ceramic materials, glass materials, glass-ceramic materials, or a combination thereof. Alternatively, the first reinforcing member may comprise glass fibers

In still other versions, the first reinforcing member may extend through an entire diameter of the body. The first reinforcing member may comprise a planar member comprising a first major surface and a second major surface. The abrasive portion may overlie the first major surface.

Alternatively, the abrasive portion can be in direct contact with the first major surface of the first reinforcing member.

Alternate embodiments of the body of the abrasive article may comprise a first reinforcing member and a second reinforcing member. The first reinforcing member and the second reinforcing member can be spaced apart from each other within the body. Alternatively, at least a portion of the abrasive portion may be disposed between the first reinforcing member and the second reinforcing member.

In a particular embodiment of the abrasive article, the first reinforcing member can be at least about 0.5% of an average thickness of the body. For example, the first reinforcing member can be at least about 1% of the average thickness of the body, such as at least about 1.1%, or even at least about 1.2%. In other non-limiting embodiments, the first reinforcing member can be not greater than about 5% of the average thickness of the body, such as not greater than about 2%, or even not greater than about 1.5%. The average thickness of the body can have a first reinforcing member content within a range between any of the minimum and maximum values noted above. The abrasive article can be formed by forming a mixture of components or precursor components that may be part of the final abrasive article. In one embodiment, the mixture can include abrasive particles. In a particular instance, the abrasive particles can have composite composition including alumina (A1 ₂ 0 ₃ ), iron oxide (Fe ₂ 0 ₃ ), silica (Si0 ₂ ), calcia (CaO), titania (Ti0 ₂ ) and the like. In certain circumstances, the composite composition can include a majority content of alumina. For example, the composite composition can have at least about 82% alumina for the total content of compounds (or elements) within the composite composition. In other instances, the content of alumina can be greater, such as at least about 83%, at least about 84%, at least about 85%, at least about 86%, or even at least about 87%, at least about 88%. Still, in at least one non-limiting embodiment, the composite composition can contain not greater than about 95% alumina, such as not greater than about 92% alumina, not greater than about 91% alumina, not greater than about 90% alumina, or even not greater than about 89% alumina. It will be appreciated that the composite composition can have a content of alumina within a range between any of the above noted minimum and maximum percentages.

According to one embodiment, the composite composition can have a minority content of silica. For example, in one instance, the composite composition can have a lesser content of silica as compared to the content of alumina. In a particular embodiment, the composite composition can have not greater than about 6.6% silica, such as not greater than about 6.5% silica, not greater than about 6% silica, not greater than about 5% silica, not greater than about 4% silica, or even not greater than about 3% silica. Still, in at least one non-limiting embodiment, the composite composition can have at least about 1% silica, such as at least about 2% silica, or even at least about 3% silica. It will be appreciated that the composite composition can have a content of silica within a range between any of the above noted minimum and maximum percentages.

In accordance with another embodiment, the composite composition can include a minority content of iron oxide. For example, the composite composition may include a lesser content of iron oxide as compared to the content of alumina. Furthermore, in other instances, the composite composition may have a lesser content of iron oxide as compared to the content of silica. Still, in another alternative embodiment, the composite composition can have a greater content of iron oxide as compared to the content of silica. For one particular embodiment, the composite composition of the abrasive particles can have not greater than about 7% iron oxide, such as not greater than about 6% iron oxide, not greater than about 5% iron oxide, not greater than about 4.5% iron oxide, or even not greater than about 4% iron oxide. Still, in other non-limiting examples, the composite composition may have at least about 1% iron oxide, such as at least about 2% iron oxide, or even at least about 3% iron oxide. It will be appreciated that the composite composition can have a content of silica within a range between any of the above noted minimum and maximum percentages. Certain exemplary composite compositions of the abrasive particles may further include some content of titania (Ti0 ₂ ). For example, one composite composition may include a minority content of titania. In other particular instances, the composite composition can have a lesser content of titania as compared to the content of alumina. In yet another embodiment, the composite composition can have a lesser content of titania as compared to the content of silica. And yet in another embodiment, the composite composition may have a lesser content of titania as compared to the content of iron oxide. For at least one non-limiting embodiment, the composite composition can have not greater than about 5% titania, such as not greater than about 4% titania. Still, for one non-limiting embodiment, the composite composition can include at least about 3.8% titania, such as at least about 3.9% titania. It will be appreciated that the composite composition can have a content of titania within a range between any of the above noted minimum and maximum percentages.

The composite composition may, in certain instances, include a content of calcia (CaO). For example, the composite composition may include a minority content of calcia. More specifically, in one particular embodiment, the composite composition can have a lesser content of calcia as compared to the content of alumina. Moreover, certain composite compositions can have a lesser content of calcia as compared to the content of silica. In yet another embodiment, the composite composition can include a lesser content of calcia as compared to the content of iron oxide. For one particular composite composition, the content of calcia can be less than the content of titania.

According to one particular embodiment, the composite composition can have not greater than about 5% calcia, such as not greater than about 4% calcia, not greater than about 3% calcia, not greater than about 2% calcia, or even not greater than about 1% calcia. In at least one non-limiting embodiment, the composite composition can have at least about 0.3% calcia, such as at least about 0.4% calcia, at least about 0.5% calcia, at least about 0.6% calcia, or even at least about 0.7% calcia, at least about 0.8% calcia. It will be appreciated that the composite composition can have a content of calcia within a range between any of the above noted minimum and maximum percentages.

Certain composite compositions of the abrasive particles may also include some content of magnesia (MgO). According to one embodiment, the composite composition can include a minority content of magnesia. In particular instances, the composite composition can have a lesser content of magnesia as compared to the content of alumina. For another embodiment, the composite composition may have a lesser content of magnesia as compared to the content of silica. In accordance with another embodiment, the composite composition may have a lesser content of magnesia as compared to the content of iron oxide. In certain other instances, the composite composition may have a lesser content of magnesia as compared to the content of titania.

Furthermore, the composite composition may have a lesser content of magnesia as compared to the content of calcia. Still, in at least one non-limiting embodiment, the composite composition can have a greater content of magnesia as compared to a content of calcia. According to one particular embodiment, the composite composition may have not greater than about 40% magnesia, such as not greater than about 30% magnesia, not greater than about 20% magnesia, not greater than about 15% magnesia, not greater than about 10% magnesia, not greater than about 8% magnesia, not greater than about 5% magnesia, or even not greater than about 2% magnesia. Still, in at least one non-limiting embodiment, the composite composition may include at least about 0.05% magnesia, such as at least about 0.1% magnesia. It will be appreciated that the composite composition can have a content of magnesia within a range between any of the above noted minimum and maximum percentages.

According to one embodiment, the composite composition can include a combination of alumina, silica, iron oxide, magnesia, calcia, and titania. In one aspect, the composition can be an ore, which has been mined and generally unrefined. According to one embodiment, the abrasive particles can be made of a crystalline material, and more particularly, can consist essentially of a crystalline material. In one particular embodiment, the composite composition can be bauxite, and more particularly, the abrasive particles may consist essentially of bauxite.

The abrasive particles may have other particular features. For example, the abrasive particles may have an elongated shaped. In particular instances, the abrasive particles may have an aspect ratio, defined as a ratio of the length: width of at least about 1 : 1, wherein the length is the longest dimension of the particle and the width is the second longest dimension of the particle (or diameter) perpendicular to the dimension of the length. In other embodiments, the aspect ratio of the abrasive particles can be at least about 2:1, such as at least about 2.5: 1, at least about 3: 1, at least about 4: 1, at least about 5: 1, or even at least about 10: 1. In one non-limiting embodiment, the abrasive particles may have an aspect ratio of not greater than about 5000: 1.

In at least one embodiment, the abrasive particles can be extruded, such that the composite composition is extruded and segmented to make abrasive particles of a desired size and shape. The abrasive particles may be sintered, and may be sintered in a particular manner to ensure certain properties and compositions described in the embodiments herein. According to one embodiment, the abrasive particles can be formed to have an ellipsoidal cross-sectional shape. An ellipsoidal shape can include circles, ellipses, and any other curvilinear shapes. Alternatively, in other instances, the abrasive particles can have a polygonal cross-sectional shape. Some suitable, non-limiting, examples of polygonal cross-sectional shapes include triangular, rectangular, pentagonal, hexagonal, septagonal, octagonal, and the like.

Embodiments of the abrasive particles may be characterized in terms of grain toughness (K1C) and hardness. For example, the hardness of the abrasive particles may be less than about 12 GPa. In some embodiments, the hardness of the abrasive particles may be less than about 11.5 GPa, such as less than about 11 GPa, less than about 10.5 GPa, less than about 10 GPa, or even less than about 9.5 GPa. In other embodiments, the hardness of the abrasive particles may be at least about 8.75 GPa, such as at least about 9 GPa, at least about 9.5 GPa, at least about 10 GPa, at least about 10.5 GPa, or even at least about 11 GPa. It will be appreciated that the abrasive particles can have a hardness within a range between any of the above noted minimum and maximum values.

Embodiments of the abrasive particles also can have a toughness of at least about 4.6 MPa- For example, the abrasive particles may have a toughness of at least about 4.7 MPa-m ^{0 5} , such as at least about 4.8 MPa-m ^{0 5} , at least about 4.9 MPa-m ^{0 5} , or even at least about 5 MPa-m ^{0 5} . In still other versions, the abrasive particles can have a toughness of not greater than about 5.4 MPa-m ^{0 5} , such as not greater than about 5.3 MPa-m ^{0 5} , not greater than about 5.2 MPa-m ^{0 5} , not greater than about 5.1 MPa-m ^{0 5} , or even not greater than about 5 MPa-m ^{0 5} . It will be appreciated that the abrasive particles can have a toughness within a range between any of the above noted minimum and maximum values.

Regarding absolute values for single grain crush strength, the force (in newtons) required to break the grains may be given in terms of the percentage of the grains broken when subjected to breaking force. For example, in one embodiment, about 500 N to about 800 N may be required to break 50% of one or more types of the abrasive particles. In one embodiment, to break 50% of the abrasive particles, at least about 500 N, such as at least about 600 N, or even at least about 700 N is required. In another non-limiting embodiment no greater than about 1000 N is required to break the abrasive particles, such as no greater than about 900 N, or even no greater than about 800 N is required. It will be appreciated that each type of abrasive particle can have an absolute crush strength within a range between the above noted minimum and maximum values.

In another embodiment, in order to break 90% of each type of abrasive particle about 850 N to about 1350 N of force may be required. In one embodiment, to break 50% of the abrasive particles, at least about 800 N, such as at least about 850 N, or even at least about 900 N is required. In another non-limiting embodiment no greater than about 1500 N is required to break the abrasive particles, such as no greater than about 1400 N, or even no greater than about 1300 N is required. It will be appreciated that each type of abrasive particle can have an absolute crush strength within a range between the above noted minimum and maximum values.

According to one particular embodiment, the abrasive particles can have an average particle size of at least about 20 microns, such as at least about 50 microns, at least about 80 microns, at least about 100 microns, at least about 150 microns, at least about 200 microns, at least about 300 microns, at least about 400 microns, at least about 500 microns, at least about 600 microns, at least about 800 microns, at least about 1000 microns, at least about 1200 microns, at least about 1500 microns, at least about 1600 microns, at least about 1700 microns, or even at least about 1800 microns. Still, in another non-limiting embodiment, the abrasive particles can have an average particle size of not greater than about 10 mm, such as not greater than about 5 mm, not greater than about 4 mm, not greater than about 3 mm, not greater than about 2 mm, or even not greater than about 1 mm. It will be appreciated, that the average particle size may be determined by measuring and averaging the longest dimension (i.e., the length) of the particles. The abrasive particles can have an average particle size within a range between any of the minimum and maximum values noted above.

According to one embodiment, the abrasive particles can have a particular porosity, which may facilitate improved performance. For example, the average porosity of the abrasive particles can be at least about 0 vol for the total volume of an abrasive particle. In one embodiment, the average porosity of the abrasive particles can be at least about 2 vol , such as at least about 2.5 vol , at least about 3 vol , at least about 3.5 vol , at least about 4 vol , at least about 5 vol , at least about 7 vol , at least about 9 vol , at least about 11 vol, or even at least about 13 vol . Still, in one non- limiting embodiment, the average porosity of the abrasive particles may be not greater than about 15 vol , such as not greater than about 14 vol , not greater than about 12 vol , not greater than about 10 vol , not greater than about 8 vol , not greater than about 6 vol , not greater than about 4 vol , not greater than about 2 vol , or even not greater than about 1 vol for the total volume of the abrasive particle. It will be appreciated that the average porosity of the abrasive particles can be within a range between any of the minimum and maximum percentages noted above.

Furthermore, the abrasive particles may have a particular average pore size. For example, the average pore size of the abrasive particles can be not greater than about 6 microns, such as not greater than about 5 microns, not greater than about 4 microns, not greater than about 3 microns, not greater than about 2 microns, or even not greater than about 1.5 microns. According to another non-limiting embodiment, the average pore size of the abrasive particles can be at least about 0.01 microns, such as at least about 0.1 microns. It will be appreciated that the average pore size of the abrasive particles can be within a range between any of the minimum and maximum percentages noted above.

The abrasive particles can be made of crystalline grains. In particular instances, the abrasive particles can include crystalline grains having a median grain size of not greater than about 1.2 microns. In other instances, the median grain size can be not greater than about 1 micron, such as not greater than about 0.9 microns, not greater than about 0.8 microns, or even not greater than about 0.7 microns. According to one non-limiting embodiment, the median grain size of the abrasive particles can be at least about 0.01 microns, such as at least about 0.05 microns, at least about 0.1 microns, at least about 0.2 microns, or even at least about 0.4 microns. It will be appreciated that the median grain size of the abrasive particles can be within a range between any of the minimum and maximum percentages noted above.

Crystalline grain size was measured from SEM micrographs. Grains are embedded in epoxy blocks and then polished to obtain a flat cross-section. The cross-sections are then etched by HF acid for two minutes to reveal the fine microstructure and measure the median grain size.

As described herein, in addition to the abrasive particles, the mixture may also include other components or precursors to facilitate formation of the abrasive article. For example, the mixture may include abrasive particles and a bond material. According to one embodiment, the bond material may include a material selected from the group consisting of an organic material, an organic precursor material, an inorganic material, an inorganic precursor material, a natural material, and a combination thereof. In particular instances, the bond material may include a metal or metal alloy, such as a powder metal material, or a precursor to a metal material, suitable for formation of a metal bond matrix material during further processing.

According to another embodiment, the mixture may include a vitreous material, or a precursor of a vitreous material, suitable for formation of a vitreous bond material during further processing. For example, the mixture may include a vitreous material in the form of a powder, including for example, an oxygen-containing material, an oxide compound or complex, a frit, and any combination thereof.

In yet another embodiment, the mixture may include a ceramic material, or a precursor of a ceramic material, suitable for formation of a ceramic bond material during further processing. For example, the mixture may include a ceramic material in the form of a powder, including for example, an oxygen-containing material, an oxide compound or complex, and any combination thereof.

According to another embodiment, the mixture may include an organic material, or a precursor of an organic material, suitable for formation of an organic bond material during further processing. Such an organic material may include one or more natural organic materials, synthetic organic materials, and a combination thereof. In particular instances, the organic material can be made of a resin, which may include a thermoset, a thermoplastic, and a combination thereof. For example, some suitable resins can include phenolics, epoxies, polyesters, cyanate esters, shellacs, polyurethanes, rubber, and a combination thereof. In one particular embodiment, the mixture includes an uncured resin material configured to form a phenolic resin bond material through further processing.

In some embodiments, the resin may have a high temperature flexure modulus of at least 1.05. Alternatively, the resin may have an increasing high temperature flexural modulus. The phenolic resin may be modified with a curing or cross-linking agent, such as hexamethylene tetramine. At temperatures in excess of about 90°C, some examples of the hexamethylene tetramine may form crosslinks to form methylene and dimethylene amino bridges that help cure the resin. The hexamethylene tetramine may be uniformly dispersed within the resin. More particularly, hexamethylene tetramine may be uniformly dispersed within resin regions as a cross-linking agent. Even more particularly, the phenolic resin may contain resin regions with cross-linked domains having a sub-micron average size.

Other materials, such as a filler, can be included in the mixture. The filler may or may not be present in the finally-formed abrasive article. The filler may include a material selected from the group consisting of powders, granules, spheres, fibers, chopped strand fibers (CSF) and a combination thereof, wherein the filler comprises a material selected from the group consisting of an inorganic material, an organic material, and a combination thereof, wherein the filler comprises a material selected from the group consisting of sand, bubble alumina, chromites, magnesite, dolomites, bubble mullite, borides, titanium dioxide, carbon products, silicon carbide, wood flour, clay, talc, hexagonal boron nitride, molybdenum disulfide, feldspar, nepheline syenite, glass spheres, glass fibers, CaF ₂ , KBF ₄ , Cryolite (Na ₃ AlF ₆ ), potassium Cryolite (K ₃ A1F ₆ ), pyrite, ZnS, copper sulfide, mineral oil, fluorides, carbonates, calcium carbonate, saran, phenoxy resin, CaO, K ₂ S0 ₄ , mineral wool, MnCl ₂ , KC1, and a combination thereof, wherein the filler comprises a material selected from the group consisting of an antistatic agent, a lubricant, a porosity inducer, coloring agent, and a combination thereof. The filler may comprise iron and sulfur having an average particle size of not greater than about 40 microns. The filler may comprise pyrite (FeS ₂ ), or consist essentially of pyrite. The filler may comprise a material selected from the group consisting of an antistatic agent, a lubricant, a porosity inducer, coloring agent, and a combination thereof. In particular instances the filler can be particulate material, it may be distinct from the abrasive particles, being significantly smaller in average particle size than the abrasive particles.

After forming the mixture the process of forming the abrasive article can further include forming a green body comprising abrasive particles contained in a bond material. A green body is a body that is unfinished and may undergo further processing before a finally-formed abrasive article is formed. For example, forming of the green body can include techniques such as pressing, hot pressing, molding, casting, printing, spraying, and a combination thereof. In one particular embodiment, forming of the green body can include pressing the mixture into a particular shape.

After forming the green body, the process can continue by treating the green body to form a finally-formed abrasive article comprising a body. Some suitable examples of treating can include curing, heating, sintering, crystallizing, polymerization, pressing, and a combination thereof. In one example, the process may include bond batching, mixing abrasive with bond, filling a mold, pressing, wheel baking or curing, finishing, inspection, speed testing, and packing and shipping.

After treating the abrasive article is formed to have a body including a particular content of bond material. For example, the body can have at least about 30 vol bond material for the total volume of the body. In other instances, the content of bond material in the body can be greater, such as at least about 35 vol , at least about 40 vol , at least about 45 vol , at least about 50 vol , at least about 55 vol , at least about 60 vol , or even at least about 65 vol . Still, in at least one non- limiting embodiment, the content of bond material in the body can be not greater than about 70 vol , such as not greater than about 65 vol , not greater than about 60 vol , not greater than about 55 vol , not greater than about 50 vol , not greater than about 45 vol , not greater than about 40 vol , or even not greater than about 35 vol . It will be appreciated that the content of bond material in the body can be within a range between any of the minimum and maximum percentages noted above. According to a particular embodiment, the body can have a particular content of porosity. For example, the body can have not greater than about 40 vol porosity for the total volume of the body. In a particular instance, the body can have not greater than about 35 vol , such as not greater than about 30 vol , not greater than about 25 vol , not greater than about 20 vol , not greater than about 15 vol , not greater than about 10 vol porosity for the total volume of the body, not greater than about 5 vol , not greater than about 4 vol , not greater than about 3 vol , not greater than about 2 vol , not greater than about 1.5 vol , not greater than about 1 vol , not greater than about 0.8 vol , not greater than about 0.5 vol , not greater than about 0.3 vol , or even not greater than about 0.1 vol . The body also can have at least about 0.001 vol porosity, such as at least about 0.01 vol porosity. It will be appreciated that the porosity of the body can be within a range between any of the minimum and maximum percentages noted above.

For certain abrasive articles of the embodiments herein, the body can have a particular content of abrasive particles. For example, in one embodiment, the body can include at least about 30 vol abrasive particles for the total volume of the body. In another embodiment, the body can have at least about 35 vol , at least about 40 vol , at least about 45 vol , at least about 50 vol , at least about 55 vol , at least about 60 vol , or even at least about 65 vol abrasive particles. In at least one non- limiting embodiment, the body can have a content of abrasive particles of not greater than about 70 vol , such as not greater than about 65 vol , not greater than about 60 vol , not greater than about 55 vol , not greater than about 50 vol , not greater than about 45 vol , not greater than about 40 vol , or even not greater than about 35 vol . It will be appreciated that the content of abrasive particles in the body can be within a range between any of the minimum and maximum percentages noted above.

The abrasive articles of the embodiments herein can have a body that may be in the form of a bonded abrasive having a shape such as a hone, a cone, a cup, flanged shapes, a cylinder, a wheel, a ring, and a combination thereof. In one particular embodiment, the body can be a bonded abrasive snagging wheel.

According to one embodiment, the abrasive article may be particularly suited for grinding and conditioning of workpieces. Certain suitable workpieces can include inorganic materials, and more particularly workpieces made of a metal or metal alloy. According to one embodiment, the abrasive article may be particularly suited to grind materials such as stainless steel or titanium.

Embodiments of the abrasive portion can have a fracture propagation toughness or work of fracture (WOF) of at least about 5 kJ/m ² . The fracture propagation toughness WOF also can be at least about 6 kJ/m ² , at least about 7 kJ/m ² , at least about 8 kJ/m ² , at least about 9 kJ/m ² , or even at least about 10 kJ/m ² . In still other versions, fracture propagation toughness WOF can be not greater than about 13 kJ/m ² , not greater than about 12 kJ/m ² , not greater than about 11 kJ/m ² , or even not greater than about 10 kJ/m ² . It will be appreciated that the abrasive portion can have a fracture propagation toughness WOF within a range between any of the minimum and maximum values noted above.

Embodiments of the reinforcing member can have openings with an open area of not greater than about 100 mm ² within a major plane of the reinforcing member. In other embodiments the open area can be not greater than about 80 mm ² within the major plane of the reinforcing member, not greater than about 60 mm ² , not greater than about 40 mm ² , not greater than about 35 mm ² , or even not greater than about 30 mm ² . The open area also can be at least about 5 mm ² , at least about 8 mm ² , at least about 10 mm ² , or even at least about 12 mm ² . It will be appreciated that the open area can be within a range between any of the minimum and maximum values noted above.

Embodiments of the openings may extend axially through at least a portion of a thickness thereof. The openings may extend entirely through the thickness of the reinforcing member. The openings also may have perimeters and define polygonal two-dimensional shapes.

Still other embodiments of the reinforcing member can have a greige weight (or uncoated weight) of not greater than about 950 g/m ² . For example, the greige weight can be not greater than about 800 g/m ² , not greater than about 600 g/m ² , or even not greater than about 500 g/m ² .

Alternatively, the greige weight can be not less than about 400 g/m ² , not less than about 450 g/m ² , or even not less than about 490 g/m ² . The greige weight also can be within a range between any of the minimum and maximum values noted above.

In addition, and as depicted in FIGS. 4A and 4B, the reinforcing member may comprise fiber bundles with the openings therebetween. The various dimensions (FIG. 4C) of the reinforcing member depend on many factors, such as the yarns, the thickness of the coating, and the style of weave. For example, some embodiments of the reinforcing member may have a selected number of threads per set distance. In the warp and weft directions, the selected number of threads may be about 10 to about 15 threads per 100 mm, in some embodiments, in either or both of the warp and weft directions. The theoretical distance between the centers of the threads or "s" (in both the warp and weft directions) may be about 5 mm to about 17 mm, in some embodiments. Examples of the grid dimension or "h" (i.e., the distance between two threads) may be about 2 mm to about 9 mm. The grid dimension also may be not greater than about 8 mm, such as not greater than about 6 mm, or even not greater than about 5 mm. The grid dimension also can at least about 2 mm, at least about 2.5 mm, or even at least about 3 mm. Each of the construction parameters can be within a range between any of the approximate minimum and maximum values noted above.

In some embodiments, the thickness of the thread "y" may be about 2 mm to about 4 mm in the weft direction, and about 1 mm to about 3 mm in the warp direction. The thread thickness also may be not greater than about 6 mm, such as not greater than about 5 mm, or even not greater than about 4 mm. Again, each of the construction parameters can be within a range between any of the approximate minimum and maximum values noted above. Some embodiments of the threads can have a width "y" of not less than about 1 mm, such as not less than about 1.2 mm, not less than about 1.4 mm, not less than about 1.6 mm, not less than about 1.8 mm, not less than about 2 mm, not less than about 2.2 mm, not less than about 2.4 mm, not less than about 2.6 mm, or even not less than about 2.8 mm. In other embodiments, the width of the fiber bundles can be not greater than about 4.5 mm, such as not greater than about 4 mm, not greater than about 3.5 mm, not greater than about 3 mm, not greater than about 2.5 mm, or even not greater than about 2 mm. The construction also can be within a range between any of the minimum and maximum values noted above.

Embodiments of the reinforcing member may comprise a grid distance "h" from one fiber bundle to an adjacent fiber bundle that is at least about 2 mm, such as at least about 2.5 mm, at least about 3 mm, at least about 3.5 mm, at least about 4 mm, at least about 4.2 mm, at least about 4.4 mm, or even at least about 4.4 mm. In other embodiments, the distance between fiber bundles is not greater than about 10 mm, such as not greater than about 8 mm, not greater than about 6 mm, or even not greater than about 5 mm. The distance between fiber bundles also can be within a range between any of the minimum and maximum values noted above.

Referring to FIG. 5, embodiments of the body can have has an adhesion of at least about 1700 lbf, e.g., for a 1-inch bar. Embodiments of the adhesion of the body can be at least about 1800 lbf, such as at least about 1900 lbf. In other embodiments, the adhesion can be not greater at least about 2200 lbf, such as not greater than about 2100 lbf, or even not greater than about 2000 lbf. The adhesion also can be within a range between any of the minimum and maximum values noted above.

FIG. 5 also represents abrasive cutting tools having bodies with an Adhesion Variance Factor (AVF). AVF can be defined as the relative 'spread' of the data points (vertically in FIG. 5) for each sample. The embodiments disclosed herein may have an AVF of not greater than about 10%, such as not greater than about 8%, not greater than about 6%, or even not greater than about 4%. Still other embodiments have an AVF that is at least 1%, such as at least 2%. The AVF also can be within a range between any of the minimum and maximum values noted above.

Embodiments of the reinforcing member can have a fracture initiation toughness (Gic) of at least about 3.3 kJ/m ² , such as at least about 3.4 kJ/m ² , at least about 3.6 kJ/m ² , at least about 3.8 kJ/m ² , at least about 4 kJ/m ² , or even at least about 4.2 kJ/m ² . Other embodiments can have a Gic of not greater than about 5 kJ/m ² , such as not greater than about 4.8 kJ/m ² , or even not greater than about 4.6 kJ/m ² . The Gic also can be within a range between any of the minimum and maximum values noted above.

EXAMPLES

A comparison of both fracture initiation toughness (G _ic ) and fracture propagation toughness WOF was conducted for three conventional samples and sample in accordance with an embodiment herein. The G _ic and WOF tests measure the crack initiation-energy and crack-propagation stability, respectively. The G _ic value is determined by measuring the point at which a crack initiates in a sample with a pre-existing flaw. The WOF is calculated by measuring the total energy it takes to propagate the crack through the entire sample. If the crack grows stably, then the G _ic will be equal to the WOF. When there is unstable fracture, the initial crack propagates farther than stable growth. As a result, the unstable WOF is less than the Gi _C - With materials like fiber-reinforced composites, it becomes more difficult to propagate a crack as the crack grows, so the WOF is then greater than the

Both Gic and WOF can be determined from a single sample, such as a rectangular bar. The test employs a single-edge-notch (SEN) geometry. The width of the sample (e.g., 0.5 to 1.5 inches) depends on the number and spacing of the webs. A 0.14-inch notch is cut along on edge of the bar with a 0.005" thick diamond wheel. The specimen thickness is 0.5-inch, leaving a 0.36-inch uncracked ligament. The notched sample is placed in a 3-point bend fixture with a 2-inch load span. The load is applied at 0.02 in/min. At the point the crack initiates, the Gic is calculated using a technique developed by JG Williams {Fracture Mechanics of Polymers, Ellis Horwood Ltd, chapter 4 (1984)). After the initiation, the loading continues until the entire bar is fractured. The total integrated energy divided by the area of the original uncracked ligament is the WOF. In addition, WOF also changes with the web spacing (e.g., about 0.2 to about 1 inch between webs), which is in turn determined by the width of the sample.

The conventional samples CSl 1, CSl 2 and CSl 3 were formed with IP AC fiberglass webs 103, 24 and 717, respectively, each of which is commercially available. The sample SI 1 was formed with web T700LL, commercially available from Adfors. Sample SI 1 comprises a lock leno weave, which is a standard leno weave plus an additional yarn in the warp direction to lock the leno interlacement and provide an even greater stability of the fabric. Every other variable of the samples was identical. The results of this example appear in Table 1.

Table 1

measured for various parameters such as thread width and opening width. The various dimensions of the samples Sl l, CSl 1 and CSl 2 are shown in the table of FIG. 4C. Both theoretical dimensions and the actual measurements from sample Sl l are included.

Referring again to FIG. 5, an Adhesion Variance Factor (AVF) may be calculated for the various samples. AVF is defined as the relative 'spread' of the data points (vertically in FIG. 5) for each sample. Samples CS 11, CS 12, CS 13 and SI 1 are the same as described previously herein. Sample CS14 is a conventional sample commercially available from Adfors as model T350L. For this testing, 1-inch wide specimens are notched. The root of the notch is at the edge of the glass web. A wedge is driven into the notch and specimen is split. This is a type of delamination test called the "wedge -driven delamination test."

All of the Adhesion (lbf) data points for SI 1 are between about 1835 and 1950 lbf, with an average of about 1892 lbf. Thus, the AVF for SI 1 at the upper end is (1950-1892)/l 892 = 3%, and at the lower end is (1892-1835)/1892 = 3%, for a total of about 6%.

In contrast, the AVF at the upper and lower ends of CS11 are (1981-1900)/1900 = 4%, and (1900-1613)/1900 = 15%, respectively, or a total AVF for CS11 of 19%.

The AVF at the upper and lower ends of CS12 are (2037-1875)/l 875 = 9%, and (1875- 1346)/1875 = 28%, respectively, or a total AVF for CS12 of 37%.

The AVF at the upper and lower ends of CS13 are (2035-1625)/1625 = 25%, and (1625- 817)/1625 = 50%, respectively, or a total AVF for CS13 of 75%.

The AVF at the upper and lower ends of CS14 are (1749-1450)/1450 = 21%, and (1450-

1028)/1450 = 29%, respectively, or a total AVF for CS14 of 50%.

Thus, AVF is much more consistent with the embodiments disclosed herein than it is for conventional samples.

Other embodiments may include the following items:

Item 1. An abrasive article comprising:

a body including an abrasive portion having:

a bond material;

abrasive particles contained in the bond material;

a reinforcing member contained in the body; wherein

the abrasive portion has a fracture propagation toughness WOF of at least about 5 kJ/m ² , and the reinforcing member has openings with an open area of not greater than about 100 mm ² within a major plane of the reinforcing member.

Item 2. The abrasive article of Item 1 , wherein the fracture propagation toughness WOF is at least about 6 kJ/m ² , at least about 7 kJ/m ² , at least about 8 kJ/m ² , at least about 9 kJ/m ² , at least about 10 kJ/m ² , not greater than about 13 kJ/m ² , not greater than about 12 kJ/m ² , not greater than about 11 kJ/m ² , not greater than about 10 kJ/m ² .

Item 3. The abrasive article of Item 1, wherein the reinforcing member comprises a greige weight of not greater than about 950 g/m ² , not greater than about 800 g/m ² , not greater than about 600 g/m ² , not greater than about 500 g/m ² , and not less than about 400 g/m ² , not less than about 450 g/m ² , not less than about 490 g/m ² . Item 4. The abrasive cutting tool of Item 1 , wherein the reinforcing member comprises a maximum thickness of at least about 1 mm, such as at least about 1.1 mm, at least about 1.2 mm, at least about 1.3 mm, not greater than about 2 mm, not greater than about 1.8 mm, not greater than about 1.5 mm, not greater than about 1.4 mm.

Item 5. The abrasive article of Item 1, wherein the reinforcing member comprises threads with the openings therebetween, and the threads have a width of not less than about 1 mm, not less than about 1.2 mm, not less than about 1.4 mm, not less than about 1.6 mm, and not greater than about 4 mm, not greater than about 3.5mm, not greater than about 3 mm.

Item 6. The abrasive cutting tool of Item 1, wherein the open area is not greater than about 80 mm ² within the major plane of the reinforcing member, not greater than about 60 mm ² , not greater than about 40 mm ² , not greater than about 35 mm ² , not greater than about 30 mm ² , wherein the open area is at least about 5 mm ² , at least about 8 mm ² , at least about 10 mm ² , at least about 12 mm ² .

Item 7. The abrasive article of Item 1, wherein the reinforcing member comprises fiber bundles with the openings therebetween, and a distance from one fiber bundle to an adjacent fiber bundle is at least about 2 mm, at least about 3 mm, at least about 3.5 mm, and not greater than about 10 mm, not greater than about 8 mm, not greater than about 6 mm.

Item 8. The abrasive cutting tool of Item 1, wherein the openings extend axially through at least a portion of a thickness thereof, the openings extend entirely through the thickness of the reinforcing member, wherein the openings have perimeters and define polygonal two-dimensional shapes.

Item 9. The abrasive cutting tool of Item 1, wherein the reinforcing member comprises not greater than about 0.5% of an average thickness of the body, at least about 1%, at least about 1.1%, at least about 1.2%, not greater than about 5%, not greater than about 2%, not greater than about 1.5%.

Item 10. The abrasive cutting tool of Item 1, wherein a volumetric ratio of the abrasive portion to the reinforcing member is at least about 5, at least about 10, at least about 15, not greater than about 20, not greater than about 15, not greater than about 10.

Item 11. The abrasive cutting tool of Item 1 , wherein the body has an adhesion of at least about 1700 lbf.

Item 12. The abrasive article of Item 11, wherein the adhesion of the body is at least about 1800 lbf, at least about 1900 lbf, and not greater at least about 2200 lbf, not greater than about 2100 lbf, not greater than about 2000 lbf.

Item 13. The abrasive cutting tool of Item 1, wherein the body has an Adhesion Variance Factor (AVF) of not greater than about 10%.

Item 14. The abrasive article of Item 13, wherein the AVF of the body is not greater than about 8%, not greater than about 6%, not greater than about 4%; at least 1%, at least 2%. Item 15. The abrasive article of Item 1 , wherein the reinforcing member has a fracture initiation toughness (Gi _C ) of at least about 3.3 kJ/m ² , at least about 3.4 kJ/m ² , at least about 3.6 kJ/m ² , at least about 3.8 kJ/m ² , at least about 4 kJ/m ² , at least about 4.2 kJ/m ² , not greater than about 5 kJ/m ² , not greater than about 4.8 kJ/m ² , not greater than about 4.6 kJ/m ² .

Item 16. The abrasive article of Item 1 , wherein the abrasive article has an outer diameter of at least about 50 cm, at least about 60 cm, at least about 70 cm, at least about 80 cm, at least about 90 cm, and not greater than about 120 cm, not greater than about 110 cm, not greater than about 100 cm, not greater than about 90 cm, not greater than about 80 cm.

Item 17. The abrasive article of Item 1 , wherein the abrasive article has an axial thickness of at least about 3 cm, at least about 5 cm, at least about 7 cm, at least about 9 cm, at least about 11 cm, and not greater than about 18 cm, not greater than about 16 cm, not greater than about 14 cm, not greater than about 12 cm, not greater than about 10 cm.

Item 18. The abrasive article of Item 1 , wherein the abrasive article has an aspect ratio of outer diameter OD to axial thickness AT (OD:AT) of at least about 2, at least about 5, at least about 7, at least about 10, at least about 20, and not greater than about 40, not greater than about 30, not greater than about 20, not greater than about 15, not greater than about 10.

Item 19. The abrasive article of Item 1 , wherein the body comprises not greater than about 10 vol porosity for the total volume of the body, not greater than about 5 vol , not greater than about 4 vol , not greater than about 3 vol , not greater than about 2 vol , not greater than about 1.5 vol , not greater than about 1 vol , not greater than about 0.8 vol , not greater than about 0.5 vol , not greater than about 0.3 vol , not greater than about 0.1 vol , at least about 0.001 vol , at least about 0.01 vol .

Item 20. The abrasive article of Item 1 , wherein the abrasive article is configured to operate at a speed of at least about 10,000 sfpm, at least about 11 ,000 sfpm, at least about 12,000 sfpm.

Item 21. The abrasive article of Item 1 , wherein the abrasive article is hot pressed.

Item 22. The abrasive article of Item 1 , wherein the reinforcing member comprises a first reinforcing member, wherein the first reinforcing member is abutting the abrasive portion, wherein the first reinforcing member is disposed within the abrasive portion, wherein the first reinforcing member defines an external surface of the body, wherein the first reinforcing member is disposed internally within the body.

Item 23. The abrasive article of Item 22, wherein the first reinforcing member extends through an entire diameter of the body, wherein the first reinforcing member is a planar member comprising a first major surface and a second major surface, and wherein the abrasive portion overlies the first major surface, wherein the abrasive portion is in direct contact with the first major surface of the first reinforcing member. Item 24. The abrasive article of Item 22, further comprising a second reinforcing member, wherein the first reinforcing member and the second reinforcing member are spaced apart from each other within the body, wherein at least a portion of the abrasive portion is disposed between the first reinforcing member and the second reinforcing member.

Item 25. The abrasive article of Item 22, wherein the first reinforcing member is at least about

0.5% of an average thickness of the body, at least about 1%, at least about 1.1%, at least about 1.2%, not greater than about 5%, not greater than about 2%, not greater than about 1.5%.

Item 26. The abrasive article of Item 1, wherein the bond material comprises a material selected from the group consisting of an organic material, an inorganic material, and a combination thereof, wherein the bond material comprises a material selected from the group consisting of a metal, a vitreous material, a ceramic, a resin, and a combination thereof, wherein the bond material comprises a phenolic resin.

Item 27. The abrasive article of Item 1, wherein the body further comprises a filler, wherein the bond material further comprises a filler, wherein the filler comprises a material selected from the group consisting of powders, granules, spheres, fibers, chopped strand fibers (CSF) and a combination thereof, wherein the filler comprises a material selected from the group consisting of an inorganic material, an organic material, and a combination thereof, wherein the filler comprises a material selected from the group consisting of sand, bubble alumina, chromites, magnesite, dolomites, bubble mullite, borides, titanium dioxide, carbon products, silicon carbide, wood flour, clay, talc, hexagonal boron nitride, molybdenum disulfide, feldspar, nepheline syenite, glass spheres, glass fibers, CaF ₂ , KBF ₄ , Cryolite (Na ₃ AlF ₆ ), potassium Cryolite (K ₃ A1F ₆ ), pyrite, ZnS, copper sulfide, mineral oil, fluorides, carbonates, calcium carbonate, saran, phenoxy resin, CaO, K ₂ S0 ₄ , mineral wool, MnCl ₂ , KC1, and a combination thereof, wherein the filler comprises a material selected from the group consisting of an antistatic agent, a lubricant, a porosity inducer, coloring agent, and a combination thereof.

Item 28. The abrasive article of Item 1, further comprising a first filler contained within the abrasive portion comprising iron and sulfur having an average particle size of not greater than about 40 microns, wherein the first filler comprises pyrite (FeS ₂ ), wherein the first filler consists essentially of pyrite.

Item 29. The abrasive article of Item 1, wherein the body comprises at least about 30 vol% bond material for the total volume of the body, at least about 35 vol%, at least about 40 vol%, at least about 45 vol%, at least about 50 vol%, at least about 55 vol%, at least about 60 vol%, at least about 65 vol%, and not greater than about 70 vol%, not greater than about 65 vol%, not greater than about 60 vol%, not greater than about 55 vol%, not greater than about 50 vol%, not greater than about 45 vol%, not greater than about 40 vol%, not greater than about 35 vol%. Item 30. The abrasive article of Item 1 , wherein the body comprises at least about 30 vol abrasive particles for the total volume of the body, at least about 35 vol , at least about 40 vol , at least about 45 vol , at least about 50 vol , at least about 55 vol , at least about 60 vol , at least about 65 vol , and not greater than about 70 vol , not greater than about 65 vol , not greater than about 60 vol , not greater than about 55 vol , not greater than about 50 vol , not greater than about 45 vol , not greater than about 40 vol , not greater than about 35 vol .

Item 31. The abrasive article of Item 1 , wherein the body is in the form of a bonded abrasive body having a shape selected from the group consisting of hones, cones, cups, flanged shapes, cylinders, wheels, rings, and a combination thereof, wherein the body is a bonded abrasive snagging wheel.

Item 32. The abrasive article of Item 1 , wherein the reinforcing member comprises an organic material, a polyimide, polyamide, polyester, aramid, or a combination thereof.

Item 33. The abrasive article of Item 1, wherein the reinforcing member comprises an inorganic material, ceramic, glass, glass-ceramic, or a combination thereof, wherein the reinforcing member comprises a phenolic resin-based binder.

Item 34. An abrasive article comprising:

a body including an abrasive portion having:

a bond material;

abrasive particles contained in the bond material;

a reinforcing member contained in the body; wherein

the body has an adhesion of at least about 1700 lbf, and an Adhesion Variance Factor (AVF) of not greater than about 10%.

Item 35. The abrasive article of Item 34, wherein the adhesion of the body is at least about 1800 lbf, at least about 1900 lbf, and not greater at least about 2200 lbf, not greater than about 2100 lbf, not greater than about 2000 lbf.

Item 36. The abrasive article of Item 34, wherein the Adhesion Variance Factor (AVF) of the body is not greater than about 8%, not greater than about 6%, not greater than about 4%; at least 1%, at least 2%.

Item 37. An abrasive article comprising:

a body including an abrasive portion having:

a bond material;

abrasive particles contained in the bond material;

a first filler contained within the abrasive portion comprising iron and sulfur having an average particle size of not greater than about 40 microns; and a reinforcing member contained in the body, the reinforcing member comprising:

(a) a greige weight of not greater than about 950 g/m ² ; or (b) a thickness of not greater than about 2 mm; or

(c) fiber bundles with the openings therebetween, and one fiber bundle and one opening have a combined dimension of not greater than about 15 mm; or

(d) openings with an open area of not greater than about 100 mm ² . Item 38. The abrasive article of Item 1, wherein the reinforcing member comprises a lock leno weave.

The processes and abrasive articles disclosed herein represent a departure from the state-of- the-art. Abrasive articles herein can utilize a combination of features, such as abrasive particle having certain features, including but limited to, composition, average pore size, average porosity, average crystal size, crystal shape, and a combination thereof. Moreover, the abrasive articles may utilize additional features such as bond material, content of bond material, content of abrasive particles, fillers, and the like. While not entirely understood, the combination of features facilitates the formation of abrasive articles that have demonstrated unexpected and remarkable improved performance.

The above-disclosed subject matter is to be considered illustrative, and not restrictive, and the appended claims are intended to cover all such modifications, enhancements, and other embodiments, which fall within the true scope of the present invention. Thus, to the maximum extent allowed by law, the scope of the present invention is to be determined by the broadest permissible interpretation of the following claims and their equivalents, and shall not be restricted or limited by the foregoing detailed description.

The Abstract is provided to comply with Patent Law and is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims. In addition, in the foregoing Detailed Description, various features may be grouped together or described in a single embodiment for the purpose of streamlining the disclosure. This disclosure is not to be interpreted as reflecting an intention that the claimed embodiments require more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive subject matter may be directed to less than all features of any of the disclosed embodiments. Thus, the following claims are incorporated into the Detailed Description, with each claim standing on its own as defining separately claimed subject matter.