等离子喷涂Al_2O_3/TiO_2纳米复合涂层的制备、结构及摩擦学性能  

Preparation,Structures and Tribological Properties of Plasma Sprayed Al_2O_3/TiO_2 Nanacomposite Coatings

作　　者：易德亮[1,2] 冶银平[1] 尹斌[1,2] 刘光[1,2] 周惠娣[1] 陈建敏[1] 

机构地区：[1]中国科学院兰州化学物理研究所固体润滑国家重点实验室,甘肃兰州730000 [2]中国科学院研究生院,北京100039

出　　处：《摩擦学学报》2011年第4期362-368,共7页Tribology

基　　金：国家创新研究群体基金(50421502);973基金项目(2007CB607601)资助~~

摘　　要：采用喷雾干燥法对溶胶-凝胶法合成的系列A l2O3/TiO2纳米复合粉体进行造粒,使用等离子喷涂技术制备系列A l2O3/TiO2纳米复合涂层.对涂层结构和形貌分析表明所制备的A l2O3/TiO2纳米复合涂层形成了具有熔融区和半熔融区的双区形态的纳米复合结构.使用UMT-2MT试验机研究了复合涂层的摩擦磨损性能,结果表明复合涂层的磨损率随TiO2含量的增加表现出先降低而后增大的趋势,TiO2质量百分数为10%的纳米复合涂层的磨损率最低;而涂层的摩擦系数随TiO2含量的增加变化不大.复合涂层的磨损机制为裂纹扩展导致的磨损剥落.Series of Al2O3/TiO2 nanocomposite powders synthesized by sol-gel method were spray dried,and series of nanocomposite coatings were prepared by plasma spraying using the spray dried powders.The nanocomposite coating had a dual-zone nanocomposite structures with semi-molten zone and melting zone.The friction and wear properties of the coatings were investigated on a UMT-2MT tester.The results indicated that the wear rate of the coatings first decreased and then increased with the increasing TiO2 content,and the coating with 10% TiO2 had the lowest wear rate.The friction coefficients of the coatings were in the range of 0.6 to 0.8.The wear mechanism of the nanocomposite coating was mainly due to the spalling caused by crack propagation.

关 键 词：Al2O3/TiO2 等离子喷涂 纳米复合涂层 摩擦磨损 

分 类 号：TH117.3[机械工程—机械设计及理论]