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公开(公告)号：US20220406498A1
公开(公告)日：2022-12-22
申请号：US17772332
申请日：2020-11-05
发明人： Akihiro Yoshinari , Hiroki Iida , Koichi Hirota , Mikio Yoshida
摘要： Provided is an R—Fe—B-based sintered magnet which has a composition comprising R (wherein R represents at least one element selected from rare earth elements, and essentially contains Nd), B, M (wherein M represents at least one element selected from Si, Al, Mn, Ni, Co, Cu, Zn, Ga, Ge, Pd, Ag, Cd, In, Sn, Sb, Pt, Au, Hg, Pb and Bi), X (wherein X represents at least one element selected from Ti, Zr, Hf, Nb, V and Ta) and C, with a remainder comprising Fe, O and unavoidable impurities, and has a main phase comprising R2Fe14B and a grain boundary phase comprising an R—C phase having a higher R concentration and a higher C concentration than those in the main phase, the R—Fe—B-based sintered magnet being characterized in that the area ratio of the R—C phase in a cross section of the magnet is more than 0% and 0.5% or less.
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公开(公告)号：US11798716B2
公开(公告)日：2023-10-24
申请号：US16592240
申请日：2019-10-03
发明人： Tetsuya Ohashi , Hiroki Iida , Koichi Hirota , Hajime Nakamura , Mikio Yoshida , Kazuya Fukui , Michihiro Oida
CPC分类号： H01F1/0536 , H01F1/0572 , H01F1/0577
摘要： Provided is a rare earth sintered magnet in which a multi-layer main phase particle having multiple layers including a layer 1 having R2 concentration, represented by at %, higher than that of a center of the particle, a layer 2 which is formed on the outside of the layer 1 and has R2 concentration lower than that of the layer 1, and a layer 3 which is formed on the outside of the layer 2 and has R2 concentration higher than that of the layer 2 is present at least in a portion in the vicinity of a surface of the main phase particle within at least 500 μm from a surface of the sintered magnet body.
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