原位Al_2O_(3pl)/Ce-TZP复合材料的显微结构与力学性能

Microstructure and Mechanical Properties of in Situ Al_2O_(3pl)/Ce-TZP Composites

研究了原位生长Ａｌ２Ｏ３片晶／Ｃｅ－ＴＺＰ复合材料的显微结构与力学性能．结果表明，只要烧结温度适当，引入原位Ａｌ２Ｏ３片晶可同时提高复合材料的强度和断裂韧性．在所研究的范围内，以含 １５ ｖｏｌ％Ａｌ２Ｏ３的复合材料有最好的强韧化效果，而增韧效果又比增强效果明显．如果烧结温度过低或者Ａｌ２Ｏ３含量过高，则复合材料的力学性能反而下降．原位Ａｌ２Ｏ３片晶／Ｃｅ－ＴＺＰ复合材料的强韧化机理为应力诱导相交增韧和片晶增韧，两者起到协同增韧的作用．

The microstructure and mechanical properties of in situ A12O3 platelet/Ce-TZP composites were studied. The results indicate that both the strength and fracture toughness of the composites can be increased by introduction of in situ Al2O3 platelets if sintered at a suitable temperature. The reinforcement is most effective for the specimens containing 15 vol% Al2O3 while the toughening effects are better than the strengthening. The mechanical properties of the composites decrease if the sintering temperature is too low or the Al2O3 content is too high. The toughening mechanisms in the composites include transformation toughening and platelet reinforcement. They are enhanced by their co-operation.