Invention Grant
US08907755B2 R-T-B-based rare earth magnet particles, process for producing the R-T-B- based rare earth magnet particles, and bonded magnet
有权
R-T-B系稀土磁体粒子，R-T-B系稀土类磁铁粒子的制造方法以及粘结磁铁
- Patent Title: R-T-B-based rare earth magnet particles, process for producing the R-T-B- based rare earth magnet particles, and bonded magnet
- Patent Title (中): R-T-B系稀土磁体粒子，R-T-B系稀土类磁铁粒子的制造方法以及粘结磁铁
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Application No.: US13835754Application Date: 2013-03-15
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Publication No.: US08907755B2Publication Date: 2014-12-09
- Inventor: Nobuhiro Katayama , Hirofumi Kawasaki , Koichiro Morimoto
- Applicant: Toda Kogyo Corp.
- Applicant Address: JP Otake-shi, Hiroshima-ken
- Assignee: Toda Kogyo Corporation
- Current Assignee: Toda Kogyo Corporation
- Current Assignee Address: JP Otake-shi, Hiroshima-ken
- Agency: Nixon & Vanderhye P.C.
- Priority: JP2012-78723 20120330
- Main IPC: H01F7/02
- IPC: H01F7/02 ; H01F1/00 ; H01F1/057 ; H01F1/01 ; H01F41/00
Abstract:
R-T-B-based rare earth magnet particles are produced by an HDDR treatment which comprises a first stage HD step of heating particles of a raw material alloy having a composition of R, B and Co 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 in which the material is held in the hydrogen-containing gas atmosphere.
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