发明名称 |
METHOD OF PRODUCING SURFACE-MODIFIED RARE EARTH SINTERED MAGNET |
摘要 |
An object of the present invention is to provide a method for producing a surface-modified rare earth metal-based sintered magnet having extremely excellent corrosion resistance even in an environment with fluctuating temperature and humidity and also having excellent magnetic characteristics. The method for producing a surface-modified rare earth metal-based sintered magnet of the present invention as a means for achieving the object is characterized by comprising a step of subjecting a rare earth metal-based sintered magnet to a heat treatment at 200°C to 600°C in an atmosphere having an oxygen partial pressure of 1 × 10 3 Pa to 1 × 10 5 Pa and a water vapor partial pressure of 45 Pa or less with the ratio between the oxygen partial pressure and the water vapor partial pressure (oxygen partial pressure/water vapor partial pressure) being 450 to 20000. |
申请公布号 |
EP2590188(A1) |
申请公布日期 |
2013.05.08 |
申请号 |
EP20110800874 |
申请日期 |
2011.06.29 |
申请人 |
HITACHI METALS, LTD. |
发明人 |
FUJIHARA MAHORO;YOSHIMURA KOSHI |
分类号 |
C22C38/00;B22F3/24;C22C38/06;C22C38/10;C22C38/16;C23C8/10;H01F1/053;H01F1/057;H01F41/02 |
主分类号 |
C22C38/00 |
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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