| 摘要 |
PURPOSE:To provide a sintered beta-Sialon having high strength in high tempera ture range. CONSTITUTION:A sintered beta-sialon incorporated with a rare earth metal oxide expressed by the formula M2O3 (M is rare earth element) as a sintering assistant and having a grain boundary phase consisting of the crystalline phase of M3Al5O12. The crystalline phase of M3Al5O12 can be produced by the crystallization heat-treatment of the sintered compact by maintaining the product at 1350-1650 deg.C for 0.5-24hr. A sintered beta-sialon having extremely high strength in a high-temperature range, especially at >1300 deg.C can be obtained by the generation of the crystalline phase of M3Al5O12 in the grain boundary phase. The present process provides a sintered compact having excellent properties as various materials for high-temperature structural materials required to keep high strength in high temperature range. |
