热压反应烧结法制备Al_2O_3/Ti_2AlC复合材料及其微观结构和性能  

Synthesis of Al_2O_3/Ti_2AlC Composite by in-situ Hot-pressing Method

作　　者：刘波波[1] 王芬[1] 朱建锋[1] 李亚玲[2] 杨志波[1] 

机构地区：[1]陕西科技大学材料科学与工程学院,陕西西安710021 [2]西安交通大学材料科学与工程学院,陕西西安710049

出　　处：《材料科学与工程学报》2009年第4期636-638,652,共4页Journal of Materials Science and Engineering

基　　金：国家自然科学基金委员会"重点学术期刊专项基金"资助项目(50672056)

摘　　要：以Ti、Al和活性炭粉为原料,通过高能球磨及热压反应烧结法在1200℃合成Al2O3/Ti2AlC复合材料,即是在Ti2AlC层状材料的制备过程中同时被合成。研究了烧结温度对反应产物的影响,并重点分析了材料微观结构和性能的关系。结果表明:高能球磨使Ti2AlC的烧结温度降低,热压烧结在1200℃时得到了物相比较均匀、致密的Al2O3/Ti2AlC复合材料;同时分析材料微观结构,少量Al2O3的引入抑制了Ti2A1C晶体的异常长大,使得晶粒细小且均匀。力学性能测试表明,该材料室温抗弯强度可达275.4MPa,断裂韧度可达10.5MPa.m1/2,密度为4.2g/cm3。Al2O3/Ti2AlC composite was synthesized by high energy ball milling and hot-pressing at 1200℃, using Ti, Si and C powders as raw materials. That is the composite was synthesized in the process of synthesis Tie AIC. The effects of sintering temperature on reactions, the phase composition and relatives between microstructure and machinability for the synthetic product were investigated. The results show that Al2O3/Ti2AlC composite was successfully obtained by hot-pressed at 1200℃. The synthesis temperature is decreased by high energy milling. Meanwhile, the microstructure shows that a small amount of A1203 inhibites the abnormal growth of Ti2 A1C crtstals, and makes grains be small and uniforms, which greatly improve the mechanical properties of the composite. The bending strength and fracture toughness of the composite reach to 275.4MPa and 10.5MPa · m1/2 , respectively. The density of the composite is 4.2g/cma.

关 键 词：Al2O3/Ti2AlC 热压烧结 微观结构 力学性能 

分 类 号：TB332[一般工业技术—材料科学与工程]