发明名称 |
Dauermagnetmaterial, dessen Herstellungsverfahren und Dauermagnet |
摘要 |
The material for permanent magnet according to the present invention comprises an acicular iron powder having successively on the surface (1) a coated layer of aluminum phosphate, (2) a diffused layer of rare earth element or a diffused layer of rare earth element.boron or a diffused layer of rare earth element.boron.nitrogen, and (3) a coated layer of aluminum phosphate. The material for permanent magnet can be produced by (a) a step of mixing and covering an acicular goethite (FeOOH) crystal with aluminum phosphate, (b) a step of preparing an acicular iron powder coated with a layer of aluminum phosphate by reducing under hydrogen atmosphere at 300-500 DEG C the acicular goethite (FeOOH) crystal covered by the aluminum phosphate, (c) a step of diffusing a rare earth element or a rare earth element and boron into the surface layer of aluminum phosphate by heating under argon atmosphere at 650-1000 DEG C the acicular iron powder coated with a layer of aluminum phosphate in the presence of the rare earth element or the rare earth element and boron, (d) a step of mixing and covering the rare earth element diffused powder or rare earth element and boron diffused powder with aluminum phosphate, and (e) a step of coating the rare earth element diffused powder or rare earth element and boron diffused powder with aluminum phosphate by heating under argon atmosphere at 300-500 DEG C the rare earth element diffused powder or rare earth element and boron diffused powder covered by the aluminum phosphate. <IMAGE> |
申请公布号 |
DE69403059(D1) |
申请公布日期 |
1997.06.12 |
申请号 |
DE1994603059 |
申请日期 |
1994.10.24 |
申请人 |
TAKAHASHI, YASUNORI, TOKYO/TOKIO, JP |
发明人 |
TAKAHASHI, YASUNORI, TOKYO/TOKIO, JP |
分类号 |
B22F1/02;C22C33/02;C23C26/00;H01F1/057;H01F1/059;H01F1/06;(IPC1-7):H01F1/057;H01F1/08 |
主分类号 |
B22F1/02 |
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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