发明授权
- 专利标题: Method for the preparation of rare earth based anisotropic permanent magnet
- 专利标题(中): 稀土类各向异性永磁体的制备方法
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申请号: US55822申请日: 1998-04-06
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公开(公告)号: US5976271A公开(公告)日: 1999-11-02
- 发明人: Tadao Nomura , Masaru Ito , Ken Ohashi
- 申请人: Tadao Nomura , Masaru Ito , 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: JPX9-102838 19970421
- 主分类号: H01F1/057
- IPC分类号: H01F1/057 ; C21D1/04
摘要:
Provided by the invention is a method for the preparation of a magnetically anisotropic permanent magnet mainly consisting of crystallites of the Nd.sub.2 Fe.sub.14 B phase. The method comprises the steps of:(a) preparing an amorphous alloy of neodymium, iron and boron in molar fractions corresponding to the Nd.sub.2 Fe.sub.14 B phase or a nanocomposite of the Nd.sub.2 Fe.sub.14 B/Fe.sub.3 B or Nd.sub.2 Fe.sub.14 B/Fe system, for example, by the melt-spun method; and (b) subjecting the amorphous alloy of neodymium, iron and boron to a heat treatment in a magnetic field of at least 3 T (tesla) at a temperature in the range from 550 to 800.degree. C. for a length of time in the range from 1.times.10.sup.2 to 1.times.10.sup.4 seconds in an atmosphere of a non-reactive gas or vacuum.
公开/授权文献
- USD396210S Optical receiver/transmitter module 公开/授权日:1998-07-21