INVESTIGATION ON A NEW METHOD FOR PREPARING SiC MICRO-POWDERS BY REACTANT CONDUCTING ELECTRICITY AND GENERATING HEAT
HE Enguang 1, 2 (1. Zhuzhou Electric Locomotive Works, Zhuzhou, Hunan 412001; 2. Electric Machinery Department, Tsinghua University, Beijing 100084)
A new method for preparing SiC micro_powders by reactant conducting electricity and generating heat without graphite core was designed and presented. The micro morphology and characteristic of synthesized SiC products were studied with SEM, XRD and granulometry. The sizes of maturity SiC grains at the center of reaction zone are 9-11 μm, while the grains at the outer zone are smaller than 5.0 μm. XRD result shows that the crystal phase in the SiC grains is mainly β -SiC, with very little α -SiC phase. The mechanism of reactant conducting electricity and the process of reaction were studied and the specific resistance of the reaction zone during the reaction process was calculated.