公开(公告)号：US06309479B1

公开(公告)日：2001-10-30

申请号：US09260481

申请日：1999-03-02

申请人： Kenji Okinaka ,  Masaaki Maekawa

发明人： Kenji Okinaka ,  Masaaki Maekawa

IPC分类号： H01F1053

CPC分类号： B82Y30/00 ,  C01G49/06 ,  C01P2002/52 ,  C01P2002/60 ,  C01P2002/72 ,  C01P2004/04 ,  C01P2004/10 ,  C01P2004/54 ,  C01P2004/62 ,  C01P2004/64 ,  C01P2006/12 ,  G11B5/70621

摘要： Spindle-shaped metal particles and a process for producing magnetic spindle-shaped metal particle containing iron as a main component, which contains cobalt of 8 to 45 atm % calculated as Co, aluminum of 5 to 20 atm %, calculated as Al, and a rare earth element of 1 to 15 atm %, calculated as rare earth element, wherein the particles have an average major axial diameter of 0.05 to 0.15 &mgr;m, an average minor axial diameter of 0.010 to 0.022 &mgr;m, an aspect ratio of 4:1 to 8:1, a particle size distribution of not more than 0.20, and an X-ray crystallite size D110 of 12.0 to 17.0 nm. The spindle-shaped metal particles have a high coercive force, an excellent particle coercive force distribution, a large saturation magnetization and an excellent oxidation stability, and are excellent in a squareness (Br/Bm) of the sheet due to a good dispersibility in a binder resin.

摘要翻译： 主轴形金属颗粒和以铁计为主要成分的磁性纺锤形金属颗粒的制造方法，其以Co计为8〜45atm％的钴，以Al计为5〜20atm％的铝， 稀土元素为1〜15atm％，以稀土元素计，其中平均主轴径为0.05〜0.15μm，平均小轴径为0.010〜0.022μm，纵横比为4:1〜 8：1，粒径分布不大于0.20，X射线晶粒尺寸D110为12.0〜17.0nm。 纺锤形金属颗粒具有高的矫顽力，优异的颗粒矫顽力分布，大的饱和磁化强度和优异的氧化稳定性，并且由于分散性良好，片材的矩形度（Br / Bm）优异 粘合剂树脂。