The Al2O3 - SiC composite powders were prepared in argon atmosphere using coal gangue and carbonaceous materials < carbon black,active carbon and anthracite) as starting materials by carbothermal reduction. Effects of excessive carbon addition,carbon types, temperature,soaking time,shaping pressure,types and amount of additives on phase composition and microstructur e of the Al2O3 -SiC composite powders were investigated. The results indicate that:temperature,soaking time and chloride additive have significant influence on the synthesized Al2O3 - SiC composite powders.Based on the results,the optimized Al2O3 -SiC composite powders （Al2O3 58 mass%and SiC 42 mass%） with particle size d50≤5μm were prepared using coal gangue and carbon black as starting materials after 3 h firing at 1 550℃.and proper additive addition could reduce the temperature by 50℃.
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