发明名称 |
Doubly-coated iron particles |
摘要 |
Methods of doubly coating iron particles. The methods comprise treating the iron particles with phosphoric acid to form a layer of hydrated iron phosphate at the surfaces of the iron particles. The particles are heated in an inert atmosphere at a temperature and for a time sufficient to convert the hydrated layer to an iron phosphate layer. The particles are then coated with a termoplastic material to provide a coating of thermoplastic material substantially uniformly circumferentially surrounding the iron phosphate layer. Doubly-coated iron particles provided in accordance with this invention are generally useful for forming magnetic components and cores for use in high frequency switching applications.
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申请公布号 |
US5063011(A) |
申请公布日期 |
1991.11.05 |
申请号 |
US19890365186 |
申请日期 |
1989.06.12 |
申请人 |
HOEGANAES CORPORATION |
发明人 |
RUTZ, HOWARD;HANEJKO, FRANCIS G. |
分类号 |
B22F1/00;C22C33/02;H01F1/20;H01F1/26;H01F3/08;H01F41/02 |
主分类号 |
B22F1/00 |
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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