高能球磨及热压合成Al_2O_3/Ti_3AlC_2复合材料显微机理分析  

Synthesis of Ternary Machinable Al_2O_3/Ti_3AlC_2 Ceramic by High Energy Milling and Hot-Pressing

作　　者：刘波波[1] 王芬[1] 朱建锋[1,2] 李亚玲[2] 崔向炀[1] 

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

出　　处：《航空材料学报》2010年第3期28-31,共4页Journal of Aeronautical Materials

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

摘　　要：以Ti,Al和活性炭粉为主要原料,利用高能球磨及热压烧结工艺在1200℃合成Al2O3/Ti3AlC2复合材料,复合材料是在Ti3AlC2层状材料的制备过程中同时被合成。研究了在Ti-Al-C体系中,烧结温度对反应产物的影响,并重点分析了反应机理及材料微观结构对性能的影响。结果表明:通过高能球磨使的Ti3AlC2的烧结温度降低,在1200℃热压烧结时得到了物相比较均匀的、致密的Al2O3/Ti3AlC2复合材料;通过XRD,DSC和SEM测试,分析了Al2O3/Ti3AlC2复合材料的相组成及显微结构,发现Al2O3以颗粒形式均匀地分布在Ti3AlC2基体中,起到弥散增强的效果,并通过阻碍Ti3AlC2表面微裂纹的扩展使裂纹在断裂扩展过程中中断,起到微裂纹增韧效果,大大提高了复合材料的力学性能。Al2O3/Ti3AlC2 composites was synthesized by high energy milling and hot-pressing using Ti,Al and C powders as raw materials.That is in the process of synthesis Ti3AlC2 layered material the composites were synthesized.The effects of sinering temperature on reactions,the microstructure and reaction of mechanism were investigated based on the analysis of XRD,EDS and SEM.The results show that Al2O3/Ti3AlC2composites was successfully obtained by hot-pressed at 1200 oC.The synthesizing temperature was decreased by high energy milling.Meanwhile,the microstructure show that Al2O3 evenly distributed in Ti3AlC2 substrate,forming dense layer of oxide film on the surface,and hindering the expansion of surface micro-cracks in the fracture process.Moreover,the mechanical properties of the composites were enhanced due to the effect of micro-crack toughening.

关 键 词：Al2O3/Ti3AlC2 复合材料 热压烧结 显微机理 

分 类 号：TB332[一般工业技术—材料科学与工程]