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Rare earth magnet and production method thereof

A technology of rare earth magnets and manufacturing methods, applied in the direction of inductance/transformer/magnet manufacturing, magnetic objects, magnetic materials, etc., can solve the problems of high Nd prices, etc., achieve the effect of increasing the coercive force and suppressing damage to the squareness

Pending Publication Date: 2021-12-07
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Nd is mainly selected as R for R-Fe-B rare earth magnets, but the price of Nd may increase due to the rapid spread of electric vehicles, etc.

Method used

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  • Rare earth magnet and production method thereof
  • Rare earth magnet and production method thereof
  • Rare earth magnet and production method thereof

Examples

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Embodiment

[0211] Hereinafter, the rare-earth magnet and its manufacturing method of the present disclosure will be further specifically described through examples and comparative examples. In addition, the rare earth magnet and its manufacturing method of the present disclosure are not limited by the conditions used in the following examples.

[0212] "Preparation of Samples"

[0213] The samples of Examples 1-6 and Comparative Examples 1-7 were prepared by the following procedures. Furthermore, the samples of Examples 1 to 4 and Comparative Examples 1 to 4 are samples that have not diffused and infiltrated the modified material, and the samples of Examples 5 to 6 and Comparative Examples 5 to 7 are samples that have diffused and infiltrated the modified material. sample.

[0214]

[0215] Strip casting materials (magnetic thin strips) of the compositions shown in Table 1 were prepared. This strip cast material was coarsely pulverized by hydrogen embrittlement, and then pulverized ...

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Abstract

To provide an R-Fe-B-based rare earth magnet excellent in the squareness and magnetic properties at high temperatures, particularly, the residual magnetization at high temperatures, and a production method thereof. The present disclosure provides a rare earth magnet including a main phase 10 and a grain boundary phase 20 present around the main phase 10. The overall composition of the rare earth magnet of the present disclosure is represented, in terms of molar ratio, by the formula: (R<1>(1-x)Lax)y(Fe(1-z)Coz)(100-y-w-v)BwM<1>v, wherein R<1> is one or more predetermined rare earth elements, and M<1> is one or more predetermined elements, and wherein 0.02<=x<=0.1, 12.0<=y<=20.0, 0.1<=z<=0.3, 5.0<=w<=20.0, and 0<=v<=2.0. The main phase 10 has an R2Fe14B-type crystal structure, the average particle diameter of the main phase 10 is from 1 to 10 (mu)m, and the volume ratio of a phase having an RFe2-type crystal structure in the grain boundary phase 20 is 0.60 or less relative to the grain boundary phase 20.

Description

technical field [0001] The present disclosure relates to rare earth magnets and methods of making the same. In particular, the present disclosure relates to R-Fe-B-based rare earth magnets (wherein R is a rare earth element) and methods of manufacturing the same. Background technique [0002] The R—Fe—B based rare earth magnet has a main phase and a grain boundary phase existing around the main phase. The main phase is with R 2 Fe 14 The magnetic phase of the B-type crystal structure. With this main phase, high remanent magnetization can be obtained. Therefore, R—Fe—B based rare earth magnets are often used in motors. [0003] When permanent magnets such as R-Fe-B-based rare earth magnets are used in motors, the permanent magnets are placed in an external magnetic field environment that changes periodically. Therefore, the permanent magnet can be demagnetized due to the increase of the external magnetic field. When a permanent magnet is used in a motor, it is required...

Claims

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Application Information

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IPC IPC(8): H01F1/057H01F41/02
CPCH01F1/0576H01F1/0577H01F41/0266H01F41/0273B22F2998/10C22C2202/02C22C33/0242B22F2999/00H01F41/0293B22F9/04B22F3/02B22F3/10B22F2202/05B22F2009/048B22F2301/355C22C38/002C22C38/005C22C38/06C22C38/10C22C38/16
Inventor 佐久间纪次庄司哲也高田幸生
Owner TOYOTA JIDOSHA KK
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