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R a-T a-B alloy powder for R-a T-a B based sintered magnet and 发明授权

2023-03-07 4600 605K 0

专利信息

申请日期 2025-07-31 申请号 JP2016510325
公开(公告)号 JP6481682B2 公开(公告)日 2019-03-13
公开国别 JP 申请人省市代码 全国
申请人 日立金属株式会社
简介 An R-T-B based alloy powder which is composed of not less than 27.5 mass% and not more than 36.0 mass% of R (where R is at least one among the rare-earth elements and always includes either Nd or Pr), not less than 0.85 mass% and not more than 1.05 mass% of B (boron), not less than 0.1 mass% and not more than 2.5 mass% of element M (where M is at least one selected from the group consisting of Al, Ti, V, Cr, Mn, Ni, Cu, Zn, Ga, Zr, Nb, Mo, Ag, In, Sn, Hf, Ta, W, Pb and Bi), and a balance T (where T is : Fe; or Fe and Co), and in which powder satisfying the condition L / d ‰¦ 5.39-1.07( a / b ) accounts for 20% or more, given a ratio a / b between a longer diameter a and a shorter diameter b and a ratio L / d between a circumferential length L and an equivalent circular diameter d (i.e., a diameter of a circle of an identical area) of contour shapes resulting from two-dimensional projection of particles.


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