| 摘要 |
PURPOSE:To obtain embedding powder for firing giving high strength, high toughness and high density SiC fiber reinforced Al2O3 ceramics by wet-mixing Al2O3 with a prescribed amt. of SiC and preburning the resultant mixture in an atmosphere of inert gas. CONSTITUTION:An Al2O3-based powdery mixture contg. 5-50vol.% SiC and <2vol.% SiO2 is prepd. by wet mixing and preburned once or more for >=1min each in an atmosphere of inert gas or nitrogen or in vacuum at 1,000-2,000 deg.C to obtain the objective embedding powder for firing of SiC fiber reinforced Al2O3 ceramics. It is preferable that the same components as sintering aids contained in ceramics to be fired are incorporated by <20vol.% in total into the embedding powder and the water content of the powder is regulated to <=0.1vol.%. The objective SiC fiber reinforced Al2O3 ceramics is produced by sintering using the embedding powder. |
