摘 要：采用燃烧合成氮化硅原始粉料，用球磨的方法进行颗粒超细 粉碎，探讨了球磨时间与粉料粒度的关系。结果表明，随着研磨时间的 增长，平均粒径减小，但研磨时间的延长到一定时，粒径基本不再减 小。 该粉料经过 24 h 的球磨后，其平均粒径可降低一个量级，由微米 级细化到亚微米级 0.5 μm 左右。 粒度分布由原来双峰分布变成了狭 窄的单峰分布，颗粒细而均匀。 测试了粉体超细粉碎前后的粒度及比 表面积，并对其形貌进行了显微形貌观察，讨论了超细过程中的一些 现象，对不同球磨机的研磨效果进行了对比。
关键词：氮化硅；超细粉碎；粒度分布
Abstract：Si3N4 powder made from self-propagating combustion synthe sis (SHS) was ultrafinely ground by attrition mill. The relationship be tween grinding time and particle size were investigated. The experimental results showed that at the beginning with grinding time increased， the mean particle size decreased gradually. After a certain grinding time， the particle size kept even although grinding time increasing. After 24 hours grinding, the particle size of raw materials of 1~2 microns broken down into sub-micron scale. The particle size distribution of the powder changed from wide spread of double peaks into narrow single peak curve. The final particles were very thin and uniform shown in the microscope. The particle size and specific surface area of the raw materials and final powder were measured. SEM images were taken to observe the mi crostructure of the powder. The phenomenon during comminution were discussed. The grinding effect of different mills were compared.
Keywords：Si3N4 powder； ultrafine comminution； particle size distribu tion
