发明授权
- 专利标题: Rare earth permanent magnet and its preparation
- 专利标题(中): 稀土永磁铁及其制备方法
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申请号: US12913252申请日: 2010-10-27
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公开(公告)号: US07985303B2公开(公告)日: 2011-07-26
- 发明人: Hiroaki Nagata , Tadao Nomura , Takehisa Minowa
- 申请人: Hiroaki Nagata , Tadao Nomura , Takehisa Minowa
- 申请人地址: JP Tokyo
- 专利权人: Shin-Etsu Chemical Co., Ltd.
- 当前专利权人: Shin-Etsu Chemical Co., Ltd.
- 当前专利权人地址: JP Tokyo
- 代理机构: Westerman, Hattori, Daniels & Adrian, LLP
- 优先权: JP2007-068803 20070316; JP2007-068823 20070316
- 主分类号: H01F1/057
- IPC分类号: H01F1/057
摘要:
A rare earth permanent magnet is prepared by disposing a powdered metal alloy containing at least 70 vol % of an intermetallic compound phase on a sintered body of R—Fe—B system, and heating the sintered body having the powder disposed on its surface below the sintering temperature of the sintered body in vacuum or in an inert gas for diffusion treatment. The advantages include efficient productivity, excellent magnetic performance, a minimal or zero amount of Tb or Dy used, an increased coercive force, and a minimized decline of remanence.
公开/授权文献
- US20110036459A1 RARE EARTH PERMANENT MAGNET AND ITS PREPARATION 公开/授权日:2011-02-17