PROCESS FOR THE PREPARATION OF COMPOSITE POWDER AL2O3-SIC

摘要

The alumina-silicon carbide based composite powder for refractory material is prepared by (a) adding aluminum metallic powder and carbon source composed of tar, pitch, resin, carbon black and graphite to kaolin with an average particle size of less than 44 micrometer, in the ratio of 0.3-1.0 mol% aluminum and 4-6 mol% carbon to 1 mol% silica in kaolin, respectively, (b) firing this mixed kaolin-carbon based compound at 1,400-1,500 deg.C for 3-5 hrs. in argon or reduction atmosphere.