Conditions for Preparation of Oxide Components and Their Effect on Properties of Al sub(2)O sub(3) - ZrO sub(2) - SiC Composite

Results of a study of phase formation in the Al sub(2)O sub(3) - ZrO sub(2) - SiC system sintered under vacuum and in a reducing medium at 1350 - 1550 degree C are reported. Conditions for preparation of Al sub(2)O sub(3) and ZrO sub(2) powders from hydroxides are specified and the effect of specific surface, temperature, and holding time on the reaction between oxide and carbide components is considered. Results of microstructural, x-ray phase, thermogravimetric, and chemical analyses of precursor materials and end products are discussed. Optimum composition (20% SiC, 15% ZrO sub(2), 65% Al sub(2)O sub(3) ) and dispersity of the mixture for obtaining a composite with a strength of about 200 MPa by a method other than high-temperature toughening are determined.