Al_2O_3/20%Ni网状复合材料抗热震性研究

THERMAL SHOCK RESISTANCE OF AN Al_2O_3/20%Ni NETWORK COMPOSITE

采用热压方法制备了Ａｌ２Ｏ３／２０％Ｎｉ网状复合材料，通过压痕－淬火法在３００－９００℃淬火温差范围内评估了热震抗力．结果表明，复合材料的抗热震性明显高于单相Ａ１２Ｏ３陶瓷．根据材料的力学和物理性能，计算了Ａ１２Ｏ３陶瓷和Ａｌ２Ｏ３／２０％Ｎｉ网状复合材料的抗热震因子Ｒ＇和 Ｒ＂＂，结果表明，复合材料的抗热震因子亦大于单相Ａｌ２Ｏ３陶瓷，与热震实验结果相吻合．

An Al2O3/20%Ni network composite was fabricated by hot pressing, and its thermal shock resistance was evaluated through an indentation-quench test within a quenching-temperature difference range of 300-900 degreesC. The composite exhibited much higher thermal shock resistance than the monolithic Al2O3 ceramic. Thermal shock resistance parameters (R' and R'''') of the Al2O3 ceramic and the Al2O3/20%Ni composite were calculated according to their mechanical and physical properties. The calculated value of the composite is higher than that of the Al2O3 ceramic, which agrees well with the result of thermal shock experiment.