Ce-TZP和Ce-TZP/Al_2O_3层状复合材料受载裂尖的相变特性

TRANSFORMATION PROPERTIES OF Ce TZP AND Ce TZP/Al 2O 3 LAYERED MICROCOMPOSITES

摘要: 用云纹干涉法研究了带直通切口的ＣｅＴＺＰ（ＴｅｔｒａｇｏｎａｌＺｉｒｃｏｎｉａＰｏｌｙｃｒｙｓｔａｌ）和ＣｅＴＺＰ／Ａｌ２Ｏ３层状复合材料三点弯曲梁的相变过程．实验发现１６００°Ｃ／３ｈ烧结１２％ｍｏｌＣｅＯ２稳定的ＣｅＴＺＰ在室温下就具有强烈的自催化效应，直通切口前缘的相变区呈树枝状，ＣｅＴＺＰ／Ａｌ２Ｏ３层状复合材料的自催化相变被Ａｌ２Ｏ３层抑制，切口前缘的相变区变短，且相变区的覆盖面积减小．文中最后对Ａｌ２Ｏ３层改变ＣｅＴＺＰ相变区及力学性能的原因进行了讨论．

Abstract: The real time transformation procedures of three point bending beams with a single edge notch of Ce TZP and Ce TZP/Al 2O 3 layered microcomposites are observed by moire interferometry. Strong autocatalytic effect on Ce TZP stabilized with 12% mol CeO 2 and sintered at 1600°C for 3 h is revealed under room temperature, and the frontal transformation zone appears to beroot like. While the autocatalytic transformation is prevented byAl 2O 3 layers in Ce TZP/Al 2O 3 layered microcomposites, th...