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Manufacturing method of rare earth alloy powder, rare earth alloy powder thereof and permanent magnet

A technology of rare earth alloy and manufacturing method, applied in the field of rare earth alloy powder and permanent magnet, can solve the problems of complex reaction mechanism, change of magnetic properties such as coercive force of magnet powder, etc.

Inactive Publication Date: 2011-09-21
TDK CORPARATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Since this HDDR method involves solid-gas phase reaction, its reaction mechanism is complicated, and the magnetic properties such as coercive force of the obtained magnet powder fluctuate depending on the manufacturing conditions.

Method used

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  • Manufacturing method of rare earth alloy powder, rare earth alloy powder thereof and permanent magnet
  • Manufacturing method of rare earth alloy powder, rare earth alloy powder thereof and permanent magnet
  • Manufacturing method of rare earth alloy powder, rare earth alloy powder thereof and permanent magnet

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Embodiment approach

[0046] A suitable method for producing the rare earth alloy powder according to the embodiment of the present invention will be described with reference to the drawings. The method for producing rare earth alloy powder according to the present embodiment is a method for producing rare earth alloy powder by performing HDDR. The HDDR method is to heat the raw material (starting alloy) in hydrogen to hydrogenate the raw material - disproportionation (HD: Hydrogenation Decomposition), and then make it dehydrogenation - recombination (DR: Desorption Recombination), thereby making the crystal finer, And the method for manufacturing rare earth alloy powder. figure 1 It is a flow chart showing the manufacturing method of the rare earth alloy powder of 1st Embodiment of this invention. Such as figure 1 As shown, the production method of the rare earth alloy powder of the present embodiment includes the following steps: casting R 2 T 14 Alloy preparation process (step S11) of obta...

Embodiment 1

[0120] Nd with the following composition was prepared using the strip casting method (SC) 2 (Fe, Co) 14 B raw material alloy (grain size is about 30.0mm, hereinafter referred to as "raw material alloy".) ( figure 1 In the alloy preparation process (step S11)). According to this embodiment figure 1 The process shown is carried out.

[0121] Nd: 29.8% by mass

[0122] Fe: 63.1% by mass

[0123] Co: 5.0% by mass

[0124] B: 1.18% by mass

[0125] Ga: 0.36% by mass

[0126] Nb: 0.30% by mass

[0127] This raw material alloy contains trace amounts of unavoidable impurities (0.2 to 0.3% by mass of the whole raw material alloy) in addition to the above-mentioned elements. The raw alloy is kept in a vacuum at a temperature ranging from 1000°C to 1200°C for 24 hours ( figure 1 In the homogenization heat treatment process (step S12)). The homogenized heat-treated raw material alloy is pulverized with a pounder, and sieved to obtain a powdered raw material alloy (with a par...

Embodiment 2

[0135] In Example 2, the HDDR-treated rare earth alloy powder was obtained in the same manner as in Example 1 except that the temperature dropped in the second DR step (step S16-2) was changed from 650°C to 620°C. This rare earth alloy powder was used as magnet powder for magnet molding.

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Abstract

The present invention provides a method for preparing a rare earth alloy powder with high coercive force HcJ through a HDDR method. The manufacturing method of the rare earth alloy powder comprises the following steps when the rare earth alloy powder is manufactured through the HDDR method: (step S13) hydrogen storing step of absorbing the hydrogen in the raw alloy of the rare earth alloy; (step S14) HD step of performing hydrogenation decomposition for the raw alloy with the absorbed hydrogen for obtaining a decomposition product; and (step S16) dehydrogenation recompounding step of keeping the temperature of the decomposition product to a first DR temperature between 750 DEG C and 950 DEG C, and reducing the temperature to a second DR temperature between 550 DEG C and 700 DEG C for releasing the hydrogen from the decomposition product thereby obtaining the rare earth alloy powder.

Description

technical field [0001] The invention relates to a method for producing rare earth alloy powder, rare earth alloy powder and permanent magnet by hydrogenation disproportionation-dehydrogenation recombination method. Background technique [0002] As a method for producing alloy powder for magnets, there is known a hydrogenation disproportionation-dehydrogenation recombination (HDDR: Hydrogenation Decomposition Desorption Recombination) method of hydrodisproportionation-recombination of a raw material alloy. The HDDR method is to store hydrogen in the raw material (starting alloy), and then heat the raw material in hydrogen to hydrogenate-disproportionate the raw material (HD: Hydrogenation Decomposition), and make it dehydrogenate-recombined (DR: Desorption Recombination), thereby making the crystal finer method. [0003] Since this HDDR method involves a solid phase-gas phase reaction, its reaction mechanism is complicated, and magnetic properties such as coercive force of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/04C22C1/04C22C33/02H01F1/053
Inventor 奥田修弘增泽清幸中村英树田边孝司森尚树铃木健一中野博文
Owner TDK CORPARATION
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