碳化硅材料用途十分广泛,为了制备高性能碳化硅材料,粉体的质量是关键,其中机械整形法是最常用的一种方法,但整形效果较差.采用化学整形法研究了熔盐体系钙镁复盐对碳化硅粉体晶体形貌、粒度分布、D50、D90等特性的影响.结果表明:MgCl2-CaCl2熔盐体系对β-SiC粉体晶体有长大作用,随保温温度的升高,晶粒形貌由层状结构向柱状结构过渡,D50表现为增大,D90也表现为增大;随保温时间的延长,晶粒形貌由细小颗粒向大颗粒过渡,D50和D90均逐渐变大.
Silicon carbide is used widely, the quality of the powder is critical to the preparation of high performance silicon carbide materials, the most commonly used method is mechanical shaping, but the results are less effective.The influence of MgCl2-CaCl2 molten salt system on grain morphology, particle size distribution, D50、D90 of silicon carbide powder was studied by chemical shaping.The results show that molten salt of MgCl2-CaCl2 helps the growth of β-SiC powder grains greatly, with the holding temperature increasing, grain morphology transforms from lamellar structure to a columnar structure, D50 and D90 increase;with the holding time increasing, grain morphology transits from small particles to large particles, D50 and D90 increase.
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