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7470334 |
A method for manufacturing a sintered compact includes the steps of preparing an alloy powder having a composition represented by Expression 1: RT W (where, R is at least one kind of rare earth metal, T is at least one kind of transitio...
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7442262 |
Disclosed is a rare earth magnet in the R-T-B (rare earth element-transition metal-boron) system that is made from an improved composition and properties of main phase alloy in the R-T-B system containing Pr and a boundary alloy. Disclos...
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7438768 |
Hydrogen embrittlement is prevented in Sm 2 Co 17 -based magnets and R 2 Fe 14 B-based magnets by metal plating the magnet, then carrying out heat treatment, or by forming a metal oxide or metal nitride layer on the metal plating layer o...
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RE40524 |
The magnet powder-resin compound particles substantially composed of rare earth magnet powder and a binder resin are in such a round shape that a ratio of the longitudinal size a to the transverse size b (a/b) is more than 1.00 and 3 or ...
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7396419 |
A method for manufacturing a sintered compact includes the steps of preparing an alloy powder having a composition represented by Expression 1: RT W (where, R is at least one kind of rare earth metal, T is at least one kind of transitio...
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7390369 |
An inventive method of making a rare-earth alloy powder is used to produce a rare-earth sintered magnet, whose main phase has a composition R 2 T 14 A (where R is one of the rare-earth elements including Y; T is Fe with or without a non-...
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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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7371292 |
A Nd—Fe—B type anisotropic exchange spring magnet is produced by a method of obtaining powder of a Nd—Fe—B type rare earth magnet alloy which comprises hard magnetic phases and soft magnetic phases wherein a minimum width of the ...
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7371290 |
To avoid various problems caused by remnant magnetization and produce an anisotropic bonded magnet at a reduced cost, a method for producing an anisotropic bonded magnet by feeding a magnetic powder (such as an HDDR powder) into the cavi...
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7364628 |
A solid material for a magnet, comprising a rare-earth/iron/nitrogen/hydrogen system magnetic material.
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7344606 |
An anisotropic bonded magnet is produced at a low cost by avoiding various problems caused by remanence. Also, the unit weight and density of a compact is increased by filling even a cavity, having no easily feedable shape, with a magnet...
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7344605 |
An anisotropic exchange spring magnet powder complexing a hard magnetic material and a soft magnetic material, wherein a rare earth metal element, a transition metal element, boron and carbon and the like are contained, and the hard magn...
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7338566 |
The present invention relates to a Sm—Co based magnet alloy useful as a raw material for producing magnets having high magnetic properties, such as sintered or bonded magnets, methods for producing such an alloy, and sintered or bonded...
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7335392 |
The objectives of the present invention are to provide a stable and simple method for producing a rare earth metal-based permanent magnet having on the surface thereof a corrosion-resistant film containing fine zinc particles dispersed t...
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7316752 |
The step of preparing a rapidly solidified alloy by rapidly quenching a melt of an R-T-B-C based rare-earth alloy (where R is at least one of the rare-earth elements including Y, T is a transition metal including iron as its main ingredi...
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7314530 |
A press machine 10 includes a die 12 with a through hole 12 a that defines a cavity, a first press surface 14 a and a second press surface 16 a for pressing a magnetic powder 18 loaded in the cavity, and magnetic field genera...
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7297213 |
An iron-based rare earth alloy magnet has a composition represented by the general formula: (Fe 1-m T m ) 100-x-y-z Q x R y M z , where T is at least one element selected from the group consisting of Co and Ni; Q is at least one element ...
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7279053 |
The present invention provides a rare earth magnet superior in magnetic properties and thermal stability. In an aspect of the present invention, a production method of an alloy thin ribbon for a rare earth magnet includes a step to obtai...
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7273405 |
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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7258751 |
In a rare earth magnet, an added heavy rare earth element R H such as Dy is effectively used without any waste, so as to effectively improve the coercive force. First, a molten alloy of a material alloy for an R-T-Q rare earth magnet (R...
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7255752 |
A method for manufacturing an R-T-B system rare earth permanent magnet that is a sintered body comprising a main phase consisting of an R 2 T 14 B phase (wherein R represents one or more rare earth elements (providing that the rare earth...
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7255751 |
When an R-T-B system rare earth permanent magnet is obtained by a mixing method to obtain a sintered body with a composition consisting essentially of 25% to 35% by weight of R (wherein R represents one or more rare earth elements, provi...
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7244318 |
A blended powder including a first powder containing an R 2 T 14 B phase as a main phase, and a second powder containing an R 2 T 17 phase at 25 wt % or more of the whole is prepared. Herein, R is at least one element selected from the ...
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7211157 |
A rare-earth alloy ingot is produced by melting an alloy composed of 20–30 wt % of a rare-earth constituent which is Sm alone or at least 50 wt % Sm in combination with at least one other rare-earth element, 10–45 wt % of Fe, 1–10 ...
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7208056 |
An R-T-B system rare earth sintered magnet having a high mechanical strength and excellent corrosion resistance is provided. The R-T-B system rare earth sintered magnet of the present invention comprises a sintered body comprising a main...
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7207102 |
Methods are provided for forming a plurality of permanent magnets with two different north-south magnetic pole alignments for use in microelectromechanical (MEM) devices. These methods are based on initially magnetizing the permanent mag...
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7204891 |
Rare earth magnet scrap and/or sludge is remelted for reuse. Once a rare earth-free magnet-constituent metal feed is loaded in a melting furnace and heated into a melt, a rare earth-containing metal feed and the rare earth magnet scrap a...
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7201809 |
A radially anisotropic ring magnet endowed with good magnetic characteristics and having throughout the magnet an angle of 80 to 100° between a center axis thereof and a radial anisotropy imparting direction is manufactured by a pressin...
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7195661 |
Magnetic materials having a coercivity not less than about 1000 Oersted are prepared in a single step procedure. A molten mixture of a desired composition having a relatively high boron content is cooled at a rate slower than about 10 5 ...
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7186303 |
A method of making a magnetic alloy material includes the steps of: preparing a melt of an alloy material having a predetermined composition; rapidly cooling and solidifying the melt to obtain a rapidly solidified alloy represented by: F...
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7172659 |
The present invention is a production method of an R-T-B—C rare earth alloy (R is at least one element selected from the group consisting of rare earth elements and yttrium, T is a transition metal including iron as a main component, B...
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7166171 |
Disclosed is a longitudinal magnetic field compacting method and device for manufacturing a neodymium (Nd) based rare earth magnet in the shape of a butterfly for use in VCM of HDD or DVD, a disk or coin for use in coreless motors, and a...
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7163591 |
Disclosed is a method of preparing a micro-structured powder for bonded magnets having high coercivity, which is advantageous in terms of low preparation costs by recycling magnet scraps, simplified mass production, minimal environmental...
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7160398 |
A melt of an alloy, represented (Fe 1-m T m ) 100-x-y-z Q x R y M z , where T is Co and/or Ni, Q is B and/or C, R is at least one rare-earth element, M is selected from Al, Si, Ti, V, Cr, Mn, Cu, Zn, Ga, Zr, Nb, Mo, Ag, Hf, Ta, W, Pt, Au...
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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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7144463 |
The present invention relates to highly quenchable Fe-based rare earth magnetic materials that are made by rapid solidification process and exhibit good magnetic properties and thermal stability. More specifically, the invention relates ...
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7141126 |
Rare earth alloy powder having an oxygen content of 50 to 4000 wt. ppm and a nitrogen content of 150 to 1500 wt. ppm is compacted by dry pressing to produce a compact. The compact is impregnated with an oil agent and then sintered. The s...
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7138018 |
A method for manufacturing an anisotropic magnet powder includes a high-temperature hydrogenation process of holding an RFeB-based alloy containing rare earth elements (R), B and Fe as main ingredients in a treating atmosphere under a fi...
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7138017 |
A method of making an alloy powder for an R—Fe—B-type rare earth magnet includes the steps of preparing a material alloy that is to be used for forming the R—Fe—B-type rare earth magnet and that has a chilled structure that const...
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7114340 |
An alloy made of heat treated material represented by Gd 5 (Si x Ge 1−x ) 4 where 0.47≦x≦0.56 that exhibits a magnetic entropy change (−ΔS m ) of at least 16 J/kg K, a magnetostriction of at least 2000 parts per million, and a ...
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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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7048808 |
The present invention provides a rare-earth sintered magnet exhibiting desirable magnetic properties in which the amount of Nd and/or Pr forming a non-magnetic phase in a grain boundary phase is reduced. Specifically, the present inventi...
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7045093 |
A method for manufacturing a sintered magnet includes the steps of producing a green compact of powder for the sintered magnet, machining the green compact with a wire-saw, and sintering the green compact.
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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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7022252 |
The permanent magnetic alloy of the present invention comprises an R—Fe—B alloy wherein R is at least one element selected from rare earth elements including Y. The R—Fe—B alloy has a composition mainly comprising Fe, substantial...
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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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7014811 |
A method for producing rare earth sintered magnets includes the steps of pressing and compacting an alloy powder for the rare earth sintered magnets, thereby preparing a plurality of green compacts, arranging the green compacts on a 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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6994755 |
Disclosed are methods for producing compositionally modified sintered RE—Fe—B-based rare earth permanent magnets, by the addition of small amounts of Nd, Cu, Ti, Nb, or other transition metals, and mixtures thereof, to maximize fract...
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