【摘要】 以带有玻璃涂层的氧化铝微粉、小尺寸氧化铝板晶(样板晶 )和Y -TZP微粉为原料 ,常压烧结得到板状氧化铝增强Y -TZP复相陶瓷。对该复相陶瓷的常温～ 80 0℃的力学性能和抗热震性进行研究后发现 ,氧化铝板晶对裂纹有反射和桥连作用 ,该复相陶瓷材料在 80 0℃下的抗弯强度和断裂韧性仅比室温下的分别下降 2 0 %和 40 %。氧化铝板晶的加入能够有效地阻止热震引起的裂纹扩展更多还原

【Abstract】 Alumina platelets and powders coated with 3wt% CaO-SiO 2 glass and yttria- stablized zirconia powders(Y-TZP) were used as starting materials.The compacts were sintered in air at 1450 ℃.The mechanical properties from room temperature to 800 ℃ and thermal shock resistance of the composites were investigated.The r esults show that the strength and toughness of the composites at 800 ℃ decrease d by 20% and 40% as compared with the values at room temperature,respectively.Th e addition of alumina platelets causes an improvement in the resistance against crack growth,and the possible mechanism could be attributed to the crack-deflec tion and bridging produced by the platelet Al 2 O 3 grains.更多还原