用碳管炉硼酸碳热还原法制备了平均粒度为 2 3 6 μm的原始B4 C粗粉 ,并分别用滚动球磨、振动球磨和气流粉碎 3种不同的粉碎工艺制取了B4 C细粉 ,研究了它们的粉碎效率、粉碎机理和粉碎动力学。结果表明 ,B4 C粉末的滚动球磨以表面粉碎为主 ,因而粉碎效率低 ;而振动球磨以体积粉碎为主 ,所以粉碎效率高 ;气流粉碎的粉碎机理以体积粉碎为主 ,表面粉碎也有一定的作用 ,因此 ,粉碎效率介于滚动球磨和振动球磨之间。滚动球磨和振动球磨均使B4 C粉末残留较多的杂质Fe ,而气流粉碎几乎不引入任何杂质 The original B4 C meal with an average particle size of 236 μm was prepared by the carbonic acid borate carbothermal reduction method. B4 C powder was prepared by three different crushing processes, ie ball mill, vibrating ball mill and air flow crushing, respectively. Their crushing efficiency, crushing mechanism and crushing kinetics were studied. The results show that the ball milling of B4 C powder is dominated by surface milling, so the grinding efficiency is low; while the vibration ball milling is dominated by volume milling, so the grinding efficiency is high; the pulverizing mechanism of air flow pulverization is dominated by volume crushing and the surface pulverization is also certain Therefore, the grinding efficiency is between the rolling ball mill and vibrating ball mill. Both ball milling and vibration ball milling left B4 C powder with more Fe, and jet milling almost did not introduce any impurities