Invention Grant
US07846273B2 R-T-B type alloy, production method of R-T-B type alloy flake, fine powder for R-T-B type rare earth permanent magnet, and R-T-B type rare earth permanent magnet
有权
R-T-B型合金，R-T-B型合金薄片的生产方法，R-T-B型稀土永磁体的细粉和R-T-B型稀土永磁体
- Patent Title: R-T-B type alloy, production method of R-T-B type alloy flake, fine powder for R-T-B type rare earth permanent magnet, and R-T-B type rare earth permanent magnet
- Patent Title (中): R-T-B型合金，R-T-B型合金薄片的生产方法，R-T-B型稀土永磁体的细粉和R-T-B型稀土永磁体
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Application No.: US11589818Application Date: 2006-10-31
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Publication No.: US07846273B2Publication Date: 2010-12-07
- Inventor: Shiro Sasaki , Hiroshi Hasegawa , Kenichiro Nakajima
- Applicant: Shiro Sasaki , Hiroshi Hasegawa , Kenichiro Nakajima
- Applicant Address: JP Tokyo
- Assignee: Showa Denko K.K.
- Current Assignee: Showa Denko K.K.
- Current Assignee Address: JP Tokyo
- Agency: Sughrue Mion, PLLC
- Priority: JPP2005-316551 20051031
- Main IPC: H01F1/00
- IPC: H01F1/00 ; H01F1/01 ; H01F1/032 ; H01F1/04 ; H01F1/047 ; H01F1/053 ; H01F1/055 ; H01F1/057 ; H01F1/06
Abstract:
An R-T-B type alloy (wherein R is at least one member selected from rare earth elements, T is a transition metal including Fe, and B includes boron) which is a raw material for use in a rare earth-based permanent magnet, wherein the volume percentage of the region containing an R2T17 phase having an average grain diameter of 3 μm or less in the short axis direction is from 0.5 to 10%.
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