发明名称 |
NdFeB-BASED SINTERED MAGNET |
摘要 |
The purpose of the present invention is to provide an NdFeB-based sintered magnet which is less susceptible to irreversible demagnetization under a high-temperature atmosphere or heat-buildup. This NdFeB-based sintered magnet is a magnet which is manufactured by preparing a base material from an NdFeB-based alloy powder through both orientation in a magnetic field and sintering, making Dy and/or Tb adhere to the surface of the base material, and subjecting the resulting base material to grain boundary diffusion treatment to diffuse the Dy and/or Tb into the grain boundaries in the base material, and which is characterized by having a squareness ratio of 95% or more. The NdFeB-based sintered magnet can be manufactured by: using, as the starting alloy, an NdFeB-based alloy in which lamellas of a rare earth-rich phase are dispersed at prescribed intervals nearly uniformly; making the alloy occlude hydrogen; preparing a base material for an NdFeB-based sintered magnet from the resulting alloy in a manner such that the heating for desorbing the occluded hydrogen is not conducted prior to a sintering step; and subjecting the base material to grain boundary diffusion treatment. |
申请公布号 |
WO2013146781(A1) |
申请公布日期 |
2013.10.03 |
申请号 |
WO2013JP58777 |
申请日期 |
2013.03.26 |
申请人 |
INTERMETALLICS CO., LTD. |
发明人 |
SAGAWA, MASATO;FUJIMOTO, NAOKI;KOMURA, KAZUYUKI;MIZOGUCHI, TETSUHIKO |
分类号 |
H01F1/057;B22F3/00;B22F3/24;B22F9/04;C22C33/02;C22C38/00;H01F1/08;H01F41/02 |
主分类号 |
H01F1/057 |
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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