PRODUCTION OF TRANSPARENT SINTERED COMPOSITE PRODUCT OF ALUMINUM OXYNITRIDE

摘要

PURPOSE:To obtain a transparent aluminum oxynitride sintered composite body containing the Al23O27N5 phase and the Al11O15N phase as a constitution matrix by sintering a mixed powder of an Al2O3 powder and an Al powder at a specific weight ratio at a specific temperature for a certain time. CONSTITUTION:65.5 to 93.4wt.% of an Al2O3 powder and 6.6 to 13.5wt.% of an aluminum powder are mixed, the mixed powder is granulated, particle- classified and formed, for example, by compressing the powder in a mold. The formed product is set in a sintering furnace and sintered in a nitrogen atmosphere at 1,750 to 1,900 deg.C for 1 to 10 hours to give the subject transparent aluminum oxynitride sintered complex body. The hot pressing of the sintered product further under higher than 100kgf/cm2 compresses and densities the product whereby the sintered product of improved transparency is obtained.