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

2023-10-29 2470 452K 0

专利信息

申请日期 2025-07-17 申请号 WOJP11057684
公开(公告)号 WO2011122577A1 公开(公告)日 2011-10-06
公开国别 WO 申请人省市代码 全国
申请人 TDK Corporation; TANAKA Satoshi; BABA Fumitaka; IWASAKI Makoto; ISHIZAKA Chikara
简介 Disclosed is a rare earth sintered magnet (10) which comprises : a magnet base body that contains a rare earth compound; and a protective layer that is arranged on the magnet base body and comprises a first layer and a second layer that are sequentially arranged from the magnet base body side. The surface portion of the magnet base body has a higher heavy rare earth element content than the inside portion of the magnet base body, said inside portion being surrounded by the surface portion. The first layer contains a rare earth oxide and has a mass ratio of the heavy rare earth elements to the light rare earth elements of 1 or more. The second layer contains an oxide that contains iron and/or boron and is different from the rare earth oxide. The second layer has a lower rare earth oxide content than the first layer.


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