| 摘要 |
PURPOSE:To eliminate color uneveness of a zirconia-reinforced alumina ceramic and to reduce dispersion of characteristics of a sintered product thereof by adding an appropriate amt. of magnesia to zirconia-reinforced alumina ceramic wherein tetragonal zirconia stabilized with a rare earth oxide is used for the reinforcing zirconia. CONSTITUTION:The title zirconia-reinforced alumina ceramic contains 10-40wt.% zirconia component contg. 1.5-15mol.% rare earth oxide (e.g., CeO2, Y2O3), 0.2-5wt.% magnesia, and 55-89.8wt.% alumina. Further, a crystalline phase in a sintered body contains primarily tetragonal zirconia crystals and alpha-alumina crystals. Since the zirconia-reinforced alumina ceramic contains tetragonal zirconia stabilized with a rare earth oxide, the ceramic has high mechanical strength and toughness, etc. Since it contains also magnesia, it is used preferably for a material for abrasion resistant member due to its small dispersion of characteristics of sintered products and eliminated color unevenness. |
