| 摘要 |
PURPOSE:To improve thermal impact resistance by mixing respectively specific ratios of raw materials of beta type sialon, nitride of Ti, Y2O3 and/or CeO2, oxide of Ni and/or oxide of Co, molding the mixture, and sintering the molding after heat treating in an N2 atmosphere. CONSTITUTION:The powder mixture formed by compounding Si3N4, AlN and Al2O3 in such a manner that the Z in the beta type sialon sintered body expressed by formula attains a prescribed value, and the nitride powder of Ti, such as TiN, are mixed to attain 22 to 50vol.% (hereafter %) of the total volume, >=1 kinds of the Y2O3 powder and CeO2 powder as sintering assistants are so mixed as to attain 0.2 to 5.4% of the total volume, and >=1 kinds of the oxide powder of Ni, such as NiO, and oxide powder of Co, such as Co3O4, are so mixed as to attain 0.3 to 2.1% of the total volume. The mixture is then molded. This molding is held for >=1 hours at 1550 deg.C to 1650 deg.C in an atm. or pressurized gaseous N2 atmosphere and is then held and sintered for >=2 hours at 1700 to 1840 deg.C, by which the conductive sialon sintered body having the high thermal impact resistance is obtd. |
