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RARE EARTH SINTERED MAGNET AND PROCESS FOR PRODUCING THE SAME 发明申请

2023-10-19 1120 1288K 0

专利信息

申请日期 2025-07-12 申请号 US11911369
公开(公告)号 US20090020193A1 公开(公告)日 2009-01-22
公开国别 US 申请人省市代码 全国
申请人 Akiyasu Ohta; Hideyuki Morimoto
简介 In a process of producing an R—Fe—B based rare-earth sintered magnet, first, an R—Fe—B based sintered magnet, including, as a main phase, R2Fe14B type compound crystal grains with a light rare-earth element RL (which is Nd and/or Pr) as a main rare-earth element R, is provided. Next, the surface of the sintered magnet body is coated with an RHM alloy layer including RH (which is at least one rare-earth element selected from Dy, Ho and Tb) and a metal M (which is at least one metallic element selected from Al, Cu, Co, Fe and Ag). Thereafter, a heat treatment is conducted at about 500° C. to about 1, 000° C. within a vacuum or an Ar atmosphere, thereby diffusing the metallic element M and the heavy rare-earth element RH inward from the surface of the rare-earth sintered magnet body.


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