IN SITU PRODUCTION OF SILICON CARBIDE-CONTAINING CERAMIC COMPOSITE POWDERS

摘要

A method for producing alumina-silicon carbide ceramic powders by in situ production of silicon carbide particles by introducing a pyrolyzable carbon source, preferably a gaseous hydrocarbon, into a reactor containing an aluminosilicate, pyrolyzing the pyrolyzable carbon source to form carbon particles in situ, wherein the carbon particles are capable of reacting with a silicate in the alumino-silicate to form carbide products, and then reacting the silicate and the carbon particles in situ at an effective temperature, preferably at least 1450 ~C and more preferably at least 1500 ~C, for a sufficient time to transform the alumino-silicate and the pyrolyzable carbon source into the composite ceramic powder having alumina (Al2O3) and silicon carbide (SiC) as major phases.