| 申请日期 | 2025-06-25 | 申请号 | BRPI0813821 |
| 公开（公告）号 | BRPI0813821B1 | 公开（公告）日 | 2018-08-07 |
| 公开国别 | BR | 申请人省市代码 | 全国 |
| 申请人 | HITACHI METALS LTD | ||
| 简介 | In an R-Fe-B based rare-earth sintered magnet according to the present invention, at a depth of 20 µm under the surface of its magnet body, crystal grains of an R 2 Fe 14 B type compound have an (RL 1-x RH x ) 2 Fe 14 B (where 0.2‰¦x‰¦0.75) layer with a thickness of 1 nm to 2 µm in their outer periphery. In this case, the light rare-earth element RL is at least one of Nd and Pr, and the heavy rare-earth element RH is at least one element selected from the group consisting of Dy, Ho and Tb. | ||
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