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7377985 |
The present invention provides a tempering process for sintered Nd—Fe—B permanent magnet material, which optimizes the microstructure of the Nd—Fe—B magnet and improves intrinsic coercive force and its consistency by increasing t...
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7147686 |
A rare earth magnet comprises rare earth magnet particles and a rare earth oxide being present between the rare earth magnet particles. The rare earth oxide is represented by a following general formula (I):
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7056393 |
A method of making a sintered body for a rare earth magnet includes the steps of (a) preparing a first coarse powder by coarsely pulverizing a rare earth alloy sintered body by a hydrogen pulverization process, (b) preparing a first fine...
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7037465 |
A powder compacting method includes the steps of: providing a powder material; loading the powder material into a cavity; uniaxially pressing the powder material, which has been loaded into the cavity, between two opposed press surfaces,...
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7018485 |
An apparatus for subjecting a rare earth alloy block to a hydrogenation process includes a casing, gas inlet and outlet ports, a member arranged to produce a gaseous flow, and a windbreak plate. The casing defines an inner space for rece...
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7004228 |
To make a raw alloy, consisting mostly of amorphous structure, highly productively and at a reduced cost for a nanocomposite magnet, a molten alloy represented by Fe 100-x-y-z R x Q y M z (where R is at least one element selected from P...
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6994756 |
A method of producing a sintered rare earth magnetic alloy wafer comprises a step of using a cutter to slice a wafer of a thickness of not greater than 3 mm from a sintered rare earth magnetic alloy having ferromagnetic crystal grains su...
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6991686 |
To provide a method for producing a magnetostrictive material of excellent magnetostrictive characteristics. The method for producing a magnetostrictive material, wherein a mixture composed of Starting Materials A, B and C is sintered, ...
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6984271 |
A rare earth magnet to be used in a motor. The rare earth magnet comprises rare earth magnet particles. Additionally, a rare earth oxide is present among the rare earth magnet particles, the rare earth oxide being represented by the foll...
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6982010 |
The present invention relates to a high performance rare earth-iron giant magnetostrictive material of the formula (Tb x1 Dy x2 Sm x3 Ho x4 R x5 )(S y1 P y2 Fe 1-y1-y2-y3 T y3 ) Q obtained by using an industry grade pure iron, instead o...
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6890392 |
A method of making a material alloy for an iron-based rare earth magnet includes the step of forming a melt of an alloy with a composition of (Fe 1-m T m ) 100-x-y-z-n (B 1-p C p ) x R y Ti 2 M n . T is Co and/or Ni; R is at least one el...
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6800145 |
A Nd—Fe—B type rare earth magnet alloy is provided with hard magnetic phases each of which has a size equal to or less than 80 nm, soft magnetic phases each of which has a size equal to or less than 80 nm, with the hard and soft magn...
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6780255 |
A magnetic powder of an Sm—Fe—N alloy, which has a mean particle diameter of 0.5 to 10 μm, and either an average acicularity of 75% or above or an average sphericity of 78% or above. The powder exhibits an extremely high residual ma...
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6777097 |
On a surface of a rare earth permanent magnet R—T—M—B wherein R is a rare earth element, T is Fe or Fe and Co, M is Ti, Nb, Al, V, Mn, Sn, Ca, Mg, Pb, Sb, Zn, Si, Zr, Cr, Ni, Cu, Ga, Mo, W or Ta, 5 wt %≦R≦40 wt %, 50 wt %≦90 ...
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6764607 |
A powder for forming a R—Fe—B bonded magnet, wherein an R compound, such as an R oxide, an R carbide, an R nitride or an R hydride, which is contained in a raw material powder such as a super rapidly cooled powder or a hydrogen treat...
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6746545 |
An R—Fe—B permanent magnet wherein R is Nd or a combination of Nd with a rare earth element is prepared by casting an R—Fe—B alloy, crushing the alloy in an oxygen-free atmosphere of argon, nitrogen or vacuum, effecting comminuti...
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6695929 |
A melt of an iron-based rare earth material alloy, represented by (Fe 1-m T m ) 100-x-y-z Q x R y M z , is prepared, wherein T is Co and/or Ni; Q is B and/or C; R is selected from Y (yttrium) and the rare earth elements; M is selected fr...
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6471786 |
The inventive method for preparing nanocomposite magnet powder includes the step of preparing material alloy powder for a nanocomposite magnet represented by a general formula Fe 100−x−y−z−u R x B y Co z M u where R is a rare-ea...
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6102980 |
A ferromagnetic powder composition for dust cores contains a ferromagnetic metal powder and 0.1-15% by volume based on the powder of titania sol and/or zirconia sol. The composition is pressure molded and desirably annealed into a dust c...
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5942053 |
The object of the invention is to provide a composition for permanent magnet with excellent magnetic properties exhibiting well the latent ability of the RFeB system tetragonal compounds. The composition for permanent magnet according to...
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5905424 |
Bonded magnets made from gas atomized powders of an rare earth alloy and having good hard magnetic characteristics are provided. The powders have an alloy composition comprising approximately 15 to 34 weight % of RE, 0.8 to 1.2 weight % ...
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5755986 |
A high-frequency composite material, having soft magnetic and dielectric characteristics, comprising a soft magnetic alloy powder represented by the general composition A a M b D c and a synthetic resin, wherein A represents at least ...
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5560784 |
A rare earth iron permanent magnet including at least one rare earth element, iron and boron as primary ingredients. The magnet can have an average grain diameter of less than or equal to about 150 μm and a carbon content of less than o...
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5520748 |
A process for manufacturing an Alnico system permanent magnet is disclosed in which the alloy powder of the Alnico system having the proper composition is manufactured through a rapid solidification process, so that the crushability and ...
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5486240 |
A method of making a permanent magnet wherein 1) a melt is formed having a base alloy composition comprising RE, Fe and/or Co, and B (where RE is one or more rare earth elements) and 2) TR (where TR is a transition metal selected from at...
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5486239 |
A magnetically anisotropic R-T-B-M powder material which is starting with an R-T-B-M raw alloy material having a c-axis crystal orientation of an R 2 T 14 B-type intermetallic compound phase. In one embodiment, the starting material is...
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5482572 |
A method for the preparation of alloys of the SE 2 Fe 17 -x TM xN y type where SE stands for a rare earth metal, including Y or a mixture of these metals, while TM stands for Co, Ni, Cu, Zr, Ga, Hf, Ta, Nb, Ti, Si, A1, V, Mo, Cr, Zn or...
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5478411 |
A process is provided for modifying the magnetic properties of an intermetallic compound comprising at least iron, or a combination of iron with at least one transition metal, and at least one rare earth element. The process comprises he...
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5433795 |
A method is provided for forming high coercivity permanent magnets from a rare earth-iron-boron metal, wherein the permanent magnets exhibit high intrinsic coercivity comparable to that of the rare earth-iron-boron metal alloy when forme...
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5345310 |
Techniques for identifying and determining the orientation, magnitude, and direction of slip plane dislocations transecting semiconductor dies are described, whereby a four point alignment pattern is examined for "squareness" and size in...
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5230749 |
A magnetically anisotropic sintered permanent magnet of the FeCoBR system (R is sum of R 1 and R 2 ) wherein: R 1 is Dy, Tb, Gd, Ho, Er, Tm and/or Yb, and R 2 comprises 80 at % or more of Nd and Pr in R 2 , and the balance of ot...
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5057165 |
A rare earth permanent magnet of a composition, Ce(CO 1 -x-y-a Fe x Cu y M a ) z , where a, x, y, and z are: 0.005<1<0.10; 0.20<x<0.40; 0.10<y<0.30; 4.8<z<6.0; and M is zirconium, titanium, nickel, and/or mangan...
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5013411 |
Corrosion-resistant rare earth magnets and a method for their manufacture, said magnets containing at least one rare earth element in an amount of 5 to 40 weight %, Fe in an amount of 50 to 90 weight %, Co in an amount of 0 to 15 wt %, B...
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5007972 |
A process for fabricating high strength Sm 2 TM 17 (TM=transition metal) magnets is disclosed. An alloy is crushed and pulverized to a very fine powder. The powder is aligned in a magnetic field, cold pressed to substantially immobiliz...
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4950335 |
A process and apparatus for producing articles for magnetic use consisting of a metal alloy in the form of a continuous strip (3) from which the articles (33) are cut out, the alloy being subjected to a heat treatment comprising at least...
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4942098 |
To obtain an anticorrosive Fe-B-R type permanent magnet; in particular, to reduce deterioration rate of the initial magnetic properties below 10% after the magnet has been kept at 80° C. in 90% relative humidity for 500 hours, the surfa...
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4902357 |
This invention concerns a heat treatment method for rare earth type permanent magnets which are primarily of the Nd-Fe-B type. With regard to these permanent magnets, which oxidize rather easily in the air, the alloy is crushed, and eith...
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4888068 |
A process for manufacturing a rare earth-iron-boron alloy permanent magnet by, after sintering, keeping the sintered alloy at temperatures of 750°-1000° C. for 0.2-5 hours, slowly cooling it at a cooling rate of 0.3°-5° C./min. to te...
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4875946 |
A heat-treatment process for producing rare earth-cobalt permanent magnets having relatively high and reproducible magnetic properties wherein one or more controlled cooling rates are applied in temperatures ranging from a sintering temp...
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4863530 |
The disclosed permanent magnet has a coercive force of larger than 500 Oe, a residual magnetic flux density of larger than 5 kG, and a maximum energy product of larger than 2 MGOe, and it consisting essentially of 48.about.66.9 Atm % of ...
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4826546 |
A process for producing permanent magnet materials, which comprises the steps of: forming an alloy powder having a mean particle size of 0.3-80 microns and composed of, in atomic percentage, 8-30% R (provided that R is at least one of...
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4746378 |
A process for producing an Sm 2 Co 17 alloy suitable for use as a permanent magnet, the alloy also containing iron, copper and zirconium or a similar group IVB or VB transition metal, and optionally praseodymium in partial replacement ...
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4745080 |
A fully self-aligned polycrystalline silicon emitter bipolar transistor. Self-alignment of the p + base contact (12) is achieved by using oxidized sidewalls (8) (sidewall spacers) of the emitter mesa (7) as part of the p + base contact...
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4734131 |
A permanent-magnet material having a composition represented by the following formula; R(Co 1 -X-Y-α-β Fe X Cu Y M α M' 62 )A (wherein X, Y, α, β, and A respectively represent the following numbers: 0.01≤X, 0.02≤Y≤0.25, ...
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4715904 |
In production of a permanent magnet by forming a roll of an elongated magnetic metal strap, a strap made from a spinodal decomposition type magnetic alloy is subjected, at least before formation into a roll, to age-hardening under concur...
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4698140 |
The present invention relates to techniques for producing magnetic particles for use in recording media. The process of the present invention generally comprises providing an alloy capable of forming a magnetic precipitate, aging the all...
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4683013 |
In production of a shadow mask for a color cathode ray tube from spinodal decomposition type magnet alloys, application of two staged agings before shaping successfully avoids thermal deformation of the product.
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4668355 |
The present invention relates to solutions for extracting magnetic particles from a surrounding matrix. The solutions extract the magnetic particles by dissolving the surrounding matrix and leaving the magnetic particles. Useful solution...
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4634462 |
A method and apparatus are provided for monitoring in situ the transformation of some fraction of a starting material to another material during the course of a thermal treatment. The starting material is heated to a preselected temperat...
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4604147 |
An alloy is proposed for use in making permanent magnets. The alloy has the following composition by weight: TBL ______________________________________ Chromium 22.5 to 25.5% Cobalt 15.0 to 17.5% Molybdenum 2.0 to ...
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