发明名称 |
RFeB-BASED MAGNET PRODUCTION METHOD, RFeB-BASED MAGNET, AND COATING MATERIAL FOR GRAIN BOUNDARY DIFFUSION PROCESS |
摘要 |
The present invention addresses the problem of providing a method for producing an RFeB system magnet with high coercivity by preventing a coating material from peeling off the surface of a base material during a grain boundary diffusion treatment. Provided is a method for producing an R L 2 Fe 14 B system magnet which is a sintered magnet or a hot-deformed magnet containing, as the main rare-earth element, a light rare-earth element R L which is at least one of the two elements ofNd and Pr, the method including the steps of: applying, to a surface of a base material M of the R L 2 Fe 14 B system magnet, a coating material 10 prepared by mixing a silicone grease 11 and an R H -containing powder 14 containing a heavy rare-earth element R H composed of at least one element selected from the group of Dy, Tb and Ho; and heating the base material M together with the coating material. The silicone having a siloxane bond prevents the coating material 10 from peeling off the surface of the base material M during the heating process. The improved adhesion of the coating material 10 to the base material M facilitates transfer of R H into the grain boundaries of the base material M, whereby the coercivity is increased. |
申请公布号 |
EP2977998(A4) |
申请公布日期 |
2016.03.23 |
申请号 |
EP20140768462 |
申请日期 |
2014.03.13 |
申请人 |
INTERMETALLICS CO., LTD.;DAIDO STEEL CO.,LTD. |
发明人 |
SAGAWA, MASATO;TAKAGI, SHINOBU;HASHINO, HAYATO |
分类号 |
H01F41/02;B22F1/00;B22F3/24;B22F9/00;C22C38/00;H01F1/057;H01F1/08 |
主分类号 |
H01F41/02 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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