中文摘要：

在铝热剂中引入不同量ZrO2（Y2O3）微米粉末，以燃烧合成技术，制备出Al2O3／10％、17％、21％、27％、33％ZrO2（Y2O3）系列成分自生复合陶瓷棒材。XRD分析与SEM观察显示：具有亚共晶成分的陶瓷熔体因以离异共晶方式生长，使得凝固后的陶瓷基体主要由α-Al2O3片晶、t-ZrO2枝晶或块晶组成；而随ZrO2（Y2O3）添加量的增多，陶瓷晶体生长方式又由离异共晶向共生共晶生长发生转化，共晶棒晶体积分数增多，使得AlO3／33％ZrO2（3Y）的陶瓷基体以微米、亚微米t-ZrO2纤维镶嵌其上的Al2O3共晶棒晶和少量α-Al2O3片晶构成。经力学性能测试，系列陶瓷棒材的硬度与断裂韧度随ZrO2（3Y）添加量增多而逐渐升高，陶瓷棒材硬度最高值达15．7GPa，断裂韧度最高可达10MPa·m^1/2。。

英文摘要：

By adding ZrO2 （3Y） micron powder in different guantity into the thermit and through combustion synthesis, a series of Al2O3/10 %, 17 %, 21%, 27 % and 33 96 ZrO2 （3Y） self- growing composite ceramic rods have been prepared. XRD and SEM analyses indicate that the composite ceramics with hypoeutectic component are composed of α-Al2O3 platelet grains and t- ZrO2 dendrites due to separated growth of Al2O3/ZrO2 from the melts. With the increase of ZrO2 （3Y） content, the volume fraction of rod - shaped eutectics increase because of growth manner transformation of Al2O3/ZrO2 phases from separated growth to coupled growth. Matrix of Al2O3/33 % ZrO2 （3Y） ceramic is composed of rod - shaped eutectics, in which micron/submicron t - ZrO2 fibers are embedded. The hardness and fracture toughness of Al2O3/ZrO2 （3Y） self- growth composite ceramics increase with increasing the ZrO2 （3Y） content, and the maximum values of vickers hardness and fracture toughness are 15.7GPa and 10 MPa·m^1/2 , respectively.