发明公开
EP2645381A3 R-T-B-based rare earth magnet particles, process for producing the R-T-B-based rare earth magnet particles, and bonded magnet
审中-公开
颗粒的R-T-B系稀土类磁铁的R-T-B系稀土类磁铁的制造方法及粘结磁铁的粒子
- 专利标题： R-T-B-based rare earth magnet particles, process for producing the R-T-B-based rare earth magnet particles, and bonded magnet
- 专利标题（中）： 颗粒的R-T-B系稀土类磁铁的R-T-B系稀土类磁铁的制造方法及粘结磁铁的粒子
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申请号： EP13161404.2申请日： 2013-03-27
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公开(公告)号： EP2645381A3公开(公告)日： 2016-12-28
- 发明人: Katayama, Nobuhiro , Kawasaki, Hirofumi , Morimoto, Koichiro
- 申请人： Toda Kogyo Corporation
- 申请人地址： 1-4 Meijishingai Otake-shi Hiroshima JP
- 专利权人： Toda Kogyo Corporation
- 当前专利权人： Toda Kogyo Corporation
- 当前专利权人地址： 1-4 Meijishingai Otake-shi Hiroshima JP
- 代理机构： Raynor, Stuart Andrew
- 优先权： JP2012078723 20120330
- 主分类号： H01F1/057
- IPC分类号： H01F1/057
摘要：
The present invention relates to a process for producing R-T-B-based rare earth magnet particles by HDDR treatment which comprises a first stage HD step of heating particles of a raw material alloy having a composition comprising R in an amount of not less than 12.5 atom% and not more than 14.3 atom%, B in an amount of not less than 4.5 atom% and not more than 7.5 atom% and Co in an amount of not more than 10 atom% to a temperature range of not lower than 770°C and not higher than 820°C in an inert atmosphere or in a vacuum atmosphere and then replacing the atmosphere with a hydrogen-containing gas atmosphere in which the raw material alloy particles are held in the same temperature range; and a second stage HD step of heating a material obtained in the first stage HD step again to a temperature range of not lower than 830°C and not higher than 870°C in which the material is held in the hydrogen-containing gas atmosphere.
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