发明授权
- 专利标题: Method for the preparation of a rare earth-cobalt based permanent magnet
- 专利标题(中): 稀土钴基永磁体的制备方法
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申请号: US481822申请日: 1983-04-04
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公开(公告)号: US4497672A公开(公告)日: 1985-02-05
- 发明人: Yoshio Tawara , Ken Ohashi
- 申请人: Yoshio Tawara , Ken Ohashi
- 申请人地址: JPX 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: JPX Tokyo
- 优先权: JPX57-57027 19820406
- 主分类号: H01F1/055
- IPC分类号: H01F1/055 ; H01F1/02
摘要:
The permanet magnet composed of a rare earth element, e.g. samarium, and cobalt together with iron, copper and some other additive elements and prepared according to the inventive method has a high coercive force and excellent squareness of the magnetic hysteresis loop despite the relatively low content of copper which has been considered to be indispensable for obtaining a high coercive force. The characteristic feature of the inventive method consists in the aging treatment of the sintered body of the alloy powder of a specified composition undertaken in two or more steps, each being carried out by continuously cooling the sintered body within a specified temperature range at a specified cooling velocity.
公开/授权文献
- US3952491A Open-end spinning frame 公开/授权日:1976-04-27