超重力下燃烧合成ZrO2(4Y)/Al2O3的成分、显微组织与力学性能

采用超重力下燃烧合成技术，通过调整ZrO₂体积分数，制备出不同成分与显微组织形态的ZrO₂(4Y)/Al₂O₃复合陶瓷，研究了材料成分、显微组织与力学性能之间的关系。XRD、SEM和EDS结果表明：当ZrO₂体积分数低于37%，陶瓷熔体生成为生长取向各异且以ZrO₂四方相亚微米纤维镶嵌于α-Al₂O₃上的棒状共晶团为基体的复合陶瓷；当ZrO₂体积分数高于40%，复合陶瓷基体则生长为略呈球形的ZrO₂四方相微米晶粒。性能测试结果显示，随着ZrO₂体积分数增加 , 陶瓷相对密度逐渐降低，陶瓷硬度与断裂韧性均在ZrO₂体积分数为33%时出现最高值，而陶瓷弯曲强度则在ZrO₂体积分数为29%达到最大值。

Composition,microstructures and mechanical properties of ZrO_2(4Y)/Al_2O_3 prepared by combustion synthesis under high gravity

By using the combustion synthesis under high gravity and adjusting the volume fraction of ZrO2,ZrO2(4Y)/Al2O3 composite ceramics with different compositions and micro-structural morphologies were prepared,and the correlations of the composition,microstructures and mechanical properties of the materials were investigated.The results of XRD,SEM and EDS show that as the volume fraction of ZrO2 is below 37%,the ceramic matrix grows from the melts to be the random-orientated rod-shaped colonies,of which the subm...