公开(公告)号：US5063011A

公开(公告)日：1991-11-05

申请号：US365186

申请日：1989-06-12

申请人： Howard Rutz ,  Francis G. Hanejko

发明人： Howard Rutz ,  Francis G. Hanejko

IPC分类号： B22F1/00 ,  C22C33/02 ,  H01F1/20 ,  H01F1/26 ,  H01F3/08 ,  H01F41/02

CPC分类号： H01F41/0246 ,  B22F1/0059 ,  C22C33/0228 ,  H01F1/24 ,  H01F1/26 ,  H01F3/08 ,  Y10S264/58 ,  Y10T428/2998

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.

摘要翻译： 双重涂覆铁粒子的方法。 所述方法包括用磷酸处理铁颗粒以在铁颗粒的表面形成一层水合磷酸铁。 颗粒在惰性气氛中在足以将水合层转化为磷酸铁层的温度和时间下加热。 然后用活性材料涂覆颗粒，以提供基本均匀地围绕磷酸铁层的热塑性材料的涂层。 根据本发明提供的双重涂覆的铁颗粒通常可用于形成用于高频开关应用的磁性部件和芯体。