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R-Fe-B RARE EARTH SINTERED MAGNET 发明申请

2023-05-03 1050 523K 0

专利信息

申请日期 2025-07-11 申请号 KR1020097025351
公开(公告)号 KR1020100037030A 公开(公告)日 2010-04-08
公开国别 KR 申请人省市代码 全国
申请人 HITACHI METALS LTD
简介 Disclosed is an R-Fe-B rare earth sintered magnet which comprises, as the main phase, an R2Fe14B compound crystal grain containing a light rare earth element Nd as the main rare earth element R. This R-Fe-B rare earth sintered magnet contains a heavy rare earth element RH (RH is at least one of Dy and Tb) introduced therein by diffusion from the surface. The concentration of the heavy rare earth element RH in the R-rich phase at the grain boundary is regulated so that it is lower than the concentration of the heavy rare earth element RH in the surface of the R2Fe14B compound crystal grain, but higher than the concentration of the heavy rare earth element RH in the central portion of the R2Fe14B compound crystal grain.COPYRIGHT KIPO & WIPO 2010


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