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R-T-B based rare earth permanent magnet and method for production thereof 发明授权

2023-10-03 2430 1655K 0

专利信息

申请日期 2025-07-10 申请号 US10541964
公开(公告)号 US7618497B2 公开(公告)日 2009-11-17
公开国别 US 申请人省市代码 全国
申请人 Eiji Kato; Chikara Ishizaka
简介 An R-T-B system rare earth permanent magnet, which comprises main phase grains consisting of R2T14B compounds and a grain boundary phase having a higher amount of R than the above described main phase grains, and which satisfies AVE(X)/Y=0.8 to 1.0; and (X/Y)max/(X/Y)min=2.0 to 13.0, wherein X represents (weight ratio of heavy rare earth elements)/(the weight ratio of all rare earth elements) for a given number of the above described main phase grains Y represents (weight ratio of heavy rare earth elements)/(weight ratio of all rare earth elements) for the sintered body as a whole; AVE(X) represents the mean value of X obtained for the given number of main phase grains; (X/Y)min represents the minimum value of (X/Y) obtained for the given number of main phase grains; and (X/Y)max represents the maximum value of (X/Y) obtained for the given number of main phase grains.


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