发明授权
- 专利标题: Permanent magnets
- 专利标题(中): 永磁体
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申请号: US346457申请日: 1989-05-02
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公开(公告)号: US5022939A公开(公告)日: 1991-06-11
- 发明人: Koichi Yajima , Osamu Kohmoto , Tetsuhito Yoneyama
- 申请人: Koichi Yajima , Osamu Kohmoto , Tetsuhito Yoneyama
- 申请人地址: JPX Tokyo
- 专利权人: TDK Corporation
- 当前专利权人: TDK Corporation
- 当前专利权人地址: JPX Tokyo
- 优先权: JPX62-191380 19870730; JPX62-259373 19871014; JPX1-20093 19890130; JPX1-20094 19890130
- 主分类号: B22F9/00
- IPC分类号: B22F9/00 ; H01F1/057
摘要:
A permanent magnet material having high coercivity and energy product is provided which contains rare earth elements, boron, at least one element of Ti, V, Cr, Zr, Nb, Mo, Hf, Ta and W, optional nickel, and a balance of Fe or Fe and Co, and consists of a primary phase of substantially tetragonal grain structure, or a mixture of such a primary phase and an amorphous or crystalline rare earth element-poor auxiliary phase wherein the volume ratio of auxiliary phase to primary phase has a specific relationship to other parameters.