摘要
通过燃烧合成技术制备出了氧化铝棒晶为基的Al2O3／ZrO2复合陶瓷棒材，研究了大体积Al2O3／ZrO2复合陶瓷的显微结构及力学性能。经对其性能测试发现，陶瓷的硬度和断裂韧性最高可达22．1GPa和9．16MPa·m^0.5；通过对裂纹扩展路径观察，发现材料增韧是通过以氧化铝棒晶桥接与拔出增韧为主并伴有α-Al2O3片品桥接多重增韧机制予以实现；经实验分析，可进一步认为以增大燃烧放热量来提高实际熔体温度，并在离心力作用下，进行材料高温高压合成，可显著提升材料的强韧性。
Based on the eutectic growth of melt, Al2O3/ZrO2 composite ceramics mainly composed of the red-shaped has been fabricated by combustion synthesis, and microstructure, synthesis mechanism and properties of Al2O3/ZrO2 bulk composite ceramics have been also discussed. It has been found that hardness and fracture toughness can reach as high as 22. 1 GPa and 9. 16 MPa ·m^0.5, and bridging and pull- off toughening by rod-shaped sapphires are main toughening mechanisms, followed by bridging toughening by α-Al2O3 platelike crystals. Moreover, it can he concluded that melt temperature could he increased to promote ceramic densification by increasing exothermic energy of combustion, meanwhile materials synthesis under high-temperature and high-pressure could he conducted by applying centrifugal force, so strengthening and toughening can be enhanced
出处
《军械工程学院学报》
2007年第4期67-71,共5页
Journal of Ordnance Engineering College
基金
国家自然科学基金资助项目（50672131）
军队科研计划项目
