Direct (In Situ) Oxdation Sintering of Porous Alumina-Silicon Composite from Slurry Cast Alminum alloy-Mullite Green Compact (Promotion of internal oxdation by Termit Reaction of SiO2-Al).

Porous alumina-silicon composite with size stability and with sufficient mechanical strength was maufacutured by sintering the green compact of the slurry cast of the mixed powders of aluminum and mullite in air. The variation of the specimen size after sintering was found to be little due to the balance of the shirinkage during sintering and the expansion caused both by the oxidation of excess aluminum in air and by termit reaction of silica and aluminum.