【摘要】 本文研究了四方和立方ＺｒＯ２在与Ｎａ－β＂－Ａｌ２Ｏ３的复合陶瓷中作为第二相所起的各种作用。结果说明ＺｒＯ２对复合陶瓷具有细化晶粒、改善显微结构、提高强度和断裂韧性的作用，与此同时也在一定程度上降低离子电导率。在提高力学性能方面，四方ＺｒＯ２除了具有与立方ＺｒＯ２相同的弥散颗粒的作用外，相变所起的作用也是很显著的。ＺｒＯ２－Ｎａ－β＂－Ａｌ２Ｏ３复合陶瓷是一种有应用价值的固体电解质材料。更多还原

【Abstract】 Composite ceramics of cubic or tetrahedral ZrO 2 phase on the microstructure, phase composition, bending strength, fracture toughness as well as ionic resistivity were tested and the mechanisms were discussed. The results showed that small amount of ZrO 2, especially the partial stabilized t phase which can transform to m phase under stress, could effectively improve the properties of single phase β " Al 2O 3 ceramics.更多还原