EMBEDDING POWDER FOR FIRING OF ALUMINA CERAMICS, ITS PRODUCTION AND PRODUCTION OF ALUMINA CERAMICS USING THE SAME

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°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.;COPYRIGHT: (C)1996,JPO