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RARE EARTH - IRON - BORON BASED MAGNET AND METHOD FOR PRODUCTION THEREOF 发明申请

2023-04-03 1600 450K 0

专利信息

申请日期 2025-07-10 申请号 EP04745866
公开(公告)号 EP1643513A1 公开(公告)日 2006-04-05
公开国别 EP 申请人省市代码 全国
申请人 Japan Science and Technology Agency; Machida Kenichi
简介 [Object] To provide a high-performance rare earth-based magnet exhibiting a high coercive force or a high residual magnetic flux density even when the content of a rare earth element such as Dy or the like which is scarce is reduced. [Construction] A rare earth-iron-boron based magnet includes a crystal grain boundary layer enriched in element M (M is at least one rare earth element selected from Pr, Dy, Tb, and Ho) by diffusion of the element M from the surface of the magnet, wherein the relation between the coercive force Hcj and the content of the element M in the whole of the magnet is represented by the following expression : Hcj ≥ 1 + 0.2 × M (wherein 0.05 ≤ M ≤ 10) wherein Hcj is the coercive force (unit : MA/m), and M is the content of the element M in the whole of the magnet (% by mass). Furthermore, the magnet satisfies the following expression : Br ≥ 1.68.- 0.17 × Hcj wherein Br is the residual magnetic flux density (unit : T) .


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