一、前言目前,稀土钴永磁材料主要是采用粉末烧结法生产的。这种磁体具有良好磁性能,已在很多方面到得应用。但它存在着一个严重问题,即脆性大。由于脆性大,致使磁体不仅不能进行车削、钻孔,而且在磨削和电火花线切割时也易掉边角。在生产、加工、安装和使用过程中磁体易剥落,甚至断裂,磁体也不能用于受冲击和振动大的器件中。此外,粉末烧结法工艺复杂,生产率低,成本高。因此,磁体的使用范围受到一定的限制,其可靠性在某些工 I. Introduction At present, rare earth cobalt permanent magnet materials are mainly produced by powder sintering. This magnet has good magnetic properties and has been used in many ways. But it has a serious problem, namely, brittleness. Due to the large brittleness, the magnet can not only not be turning, drilling, grinding and WEDM also easy to lose corners. During production, processing, installation and use, the magnet easily peels off or even breaks, and the magnet can not be used in devices that are subject to shock and vibration. In addition, the powder sintering process complex, low productivity, high cost. Therefore, the use of the magnet is subject to certain restrictions, its reliability in some workers