发明申请
US20140335268A1 RARE EARTH SINTERED MAGNET, METHOD FOR PRODUCING SAME, MOTOR AND AUTOMOBILE
审中-公开
稀土烧结磁铁,其生产方法,电机和汽车
- 专利标题: RARE EARTH SINTERED MAGNET, METHOD FOR PRODUCING SAME, MOTOR AND AUTOMOBILE
- 专利标题(中): 稀土烧结磁铁,其生产方法,电机和汽车
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申请号: US14340957申请日: 2014-07-25
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公开(公告)号: US20140335268A1公开(公告)日: 2014-11-13
- 发明人: Satoshi Tanaka , Fumitaka Baba , Makoto Iwasaki , Chikara Ishizaka
- 申请人: TDK Corporation
- 优先权: JP2010-079249 20100330
- 主分类号: H01F41/02
- IPC分类号: H01F41/02 ; H01F41/00
摘要:
A rare earth sintered magnet 10 including a magnet body that includes a rare earth compound, and a protective layer on the magnet body, having a first layer and a second layer in that order from the magnet body side, wherein the surface portion of the magnet body has a higher heavy rare earth element content than the interior of the magnet body that is surrounded by the surface portion, the first layer includes a rare earth oxide, the mass ratio of the heavy rare earth element being 1 or greater with respect to the light rare earth element, and the second layer includes an oxide containing iron and/or boron which is different from the rare earth oxide, the second layer having a lower rare earth oxide content than the first layer.
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