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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。
The composition and microstructure of ZrO2 (4Y) / Al2O3 composite ceramics were prepared by adjusting the volume fraction of ZrO2. The relationship between the material composition, microstructure and mechanical properties was studied. The results of XRD, SEM and EDS show that when the volume fraction of ZrO2 is less than 37%, the ceramic melt is formed into a composite ceramic matrix with different growth orientations and rod-shaped eutectic matrix with ZrO2 tetragonal submicron fibers embedded in α-Al2O3 ; When the volume fraction of ZrO2 is higher than 40%, the composite ceramic matrix grows into a slightly spherical tetragonal ZrO2 grain. The results of performance test showed that the relative density of ceramic decreases with the increase of volume fraction of ZrO2, and the ceramic hardness and fracture toughness show the highest values when the volume fraction of ZrO2 is 33%, while the bending strength of ceramic reaches the maximum when the volume fraction of ZrO2 is 29% value.