所谓超微粒材料系指直径在1μ以下的微粒粉体。它可应用于导电材料、烧结材料、化学触媒和磁记录介质等许多方面,但在工业上,用量最大的主要是磁记录介质用的各种磁粉。磁记录介质用的超微粒材料——磁粉,应满足下述要求: 1.饱和磁化强度大; 2.矫顽力适当; The term “ultrafine particle material” refers to fine particle powder having a diameter of 1 μ or less. It can be applied to conductive materials, sintered materials, chemical catalysts and magnetic recording media and many other aspects, but in industry, the largest amount of magnetic recording media used in various magnetic powder. Magnetic material used in magnetic recording media - magnetic powder, should meet the following requirements: 1. Saturation magnetization; 2. Coercive force appropriate;