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

RARE EARTH SINTERED MAGNET, METHOD FOR PRODUCING SAME, MOTOR AND AUTOMOBILE
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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