结构陶瓷的抗热震性能研究

Research on Thermal Shock Resistance of Ceramic Matrix Composites

通过一系列陶瓷材料的抗热冲击性能实验，证明添加ｗ（ＺｒＯ２）＝２０％可使Ａｌ２Ｏ３复合陶瓷的热震温度达到３１０℃；如果添加ｗ（ＳｉＣＷ）＝２０％可使Ａｌ２Ｏ３复合材料的热震温度达到４３０℃，使Ｓｉ３Ｎ４复合材料的热震温度达到６５０℃；如果采用ｗ（ＳｉＣＷ）＝２０％，同时添加Ａｌ２Ｏ３，Ｙ２Ｏ３等烧结助剂，由于强化晶界的作用，可使Ｓｉ３Ｎ４复合材料的热震温度达到７００～７５０℃．

On the basis of experiments of the thermal shock resistance in ceramic matrix composites, this paper verifies that the Al 2O 3 composites added 20%ZrO 2 have a thermal shock temperature in 310 ℃, the Al 2O 3 composites added 20%SiC W have a thermal shock temperature in 430 ℃ and Si 3N 4 composites added some additive have a thermal shock temperature in 650 ℃. If Si 3N 4 composites added 20%SiC W, Al 2O 3 and Y 2O 3, they have the thermal shock temperatures in 700￣750 ℃. The paper also explains and discusses the reasons of high thermal shock resistance of those composites with additive.