碳热还原法制备SiC的热力学分析  

Thermodynamics analysis of SiC prepared by carbothermic method

作　　者：王福[1] 李艾[2] 郝玉翠[2,3] 郝斌[2,3] 

机构地区：[1]中国科学院唐山高新技术研究与转化中心,河北唐山063000 [2]唐山学院环境与化学工程系,河北唐山063000 [3]唐山市微纳米材料制备及应用重点实验室,河北唐山063000

出　　处：《粉末冶金工业》2016年第3期17-20,共4页Powder Metallurgy Industry

基　　金：唐山市科技计划资助项目(14130234B);唐山学院材料科学与工程重点学科资助项目(TSC2013003)

摘　　要：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。Thermodynamics analysis of silicon carbide prepared by carbothermic method was introduced. Through the thermodynamics calculating,the effects of CO partial pressure,particle size and mixing uniformity of SiO2 and C particles on the preparation of SiC were studied. The results demonstrate that,reducing partial pressure of CO can effectively increase the tendency of SiC formation. The particle size and mixing uniformity of SiO2 and C particles is quite important for carbothermic reduction reaction of SiC. The morphology of SiC particles can be con-trolled by adjusting the temperature and CO gas partial pressure.

关 键 词：碳热还原 SIC 热力学分析 

分 类 号：O613.72[理学—无机化学]