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对碳热还原法制备SiC进行了热力学分析。通过热力学计算,分析了CO分压、SiO_2和C颗粒的粒度及其混合的均匀性对制备SiC反应的影响。结果表明:一定温度下降低CO的分压能有效增大反应生成SiC的热力学趋势;对碳热还原反应而言,SiO_2颗粒和C颗粒的混合均匀性及其各自的粒度非常重要;通过控制温度和调整CO气体的分压,可以控制生成SiC的微观形貌。
The thermodynamic analysis of SiC prepared by carbothermal reduction was carried out. Through the thermodynamic calculation, the effects of CO partial pressure, the particle size of SiO_2 and C particles and their homogeneity on the SiC reaction were analyzed. The results show that the partial pressure of CO at a certain temperature can effectively increase the thermodynamic tendency of the reaction to form SiC. For the carbothermal reduction reaction, the mixing uniformity of SiO 2 particles and C particles and their respective particle sizes are very important. By controlling the temperature And adjust the partial pressure of CO gas, you can control the formation of SiC micro-morphology.