超重力下燃烧合成Al_2O_3/ZrO_2(4Y)成分、结构与性能  

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

作　　者：赵忠民[1] 张龙[1] 宋亚林[1] 朱浩[1] 潘传增[1] 

机构地区：[1]军械工程学院先进材料研究所

出　　处：《特种铸造及有色合金》2008年第S1期297-302,共6页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金项目资助(50672131)

摘　　要：通过在铝热剂中引入ZrO2(4Y)粉末,以超重力下燃烧合成技术,制备出不同成分与结构的Al2O3/ZrO2(4Y)大体积新型复合陶瓷板材,并研究了复合陶瓷成分、显微结构与力学性能之间的关系。XRD、SEM与EDS表明,Al2O3/33ZrO2(4Y)是以取向各异且纳微米t-ZrO2纤维呈三角对称镶嵌其上的棒状共晶团为基,且周围分布着t-ZrO2微米球晶;同时,Al2O3/40ZrO2(4Y)则以t-ZrO2微米球晶为基,周围分布着不规则形状的α-Al2O3晶及少量的共晶团组织。相比于国外定向凝固Al2O3/ZrO2(Y2O3),试验Al2O3/33ZrO2(4Y)强硬性的提高可归因于材料的高致密性、小尺寸缺陷及残余压应力增韧、相变增韧机制所导致的高断裂韧度;同时,Al2O3/40ZrO2(4Y)虽在硬度上有所下降,但在弯曲强度与断裂韧度却分别提高了19.0%与311.1%,故材料的强化可认为是因t-ZrO2微米球晶基体所具有的小尺寸缺陷及相变增韧与微裂纹增韧机制所诱发的高断裂韧度所致。By introducing ZrO2 (4Y) powder into the thermit, the large-scale plates of novel Al2O3/ZrO2 (4Y) composite ceramics with different component and microstructure were prepared through combustion synthesis under high gravity, and the correlations of component,microstructures and mechanical properties of composite ceramics were investigated. XRD, SEM and EDS showed that Al2O3/33%ZrO2 (4Y) were composed of random-orientated rod-shaped colonies consisting of a triangular dispersion of orderly t-ZrO2 submicron fi...

关 键 词：AL2O3/ZRO2(4Y) 燃烧合成 超重力 自生长 强韧化 

分 类 号：TF124.3[冶金工程—粉末冶金]