等离子喷涂Al2O3-30％TiO2微米／纳米复合涂层的结构与耐磨性能  

Structure and Wear Properties of Plasma Sprayed Al_2O_3-30%TiO_2 Micro/Nano-composite Coatings

作　　者：易德亮[1,2] 冶银平[1] 刘光[1,2] 尹斌[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,兰州730000 [2]中国科学院研究生院,北京100039

出　　处：《材料工程》2012年第5期24-29,共6页Journal of Materials Engineering

基　　金：国家创新研究群体基金资助项目(50421502);国家重点研究发展计划(973)项目(2007CB607601)

摘　　要：采用溶胶-凝胶法合成了不同粒径的Al2O3-30%(质量分数)TiO2纳米复合粉体,用喷雾干燥法对合成粉体进行喷雾造粒,造粒后的粉体通过等离子喷涂制备Al2O3/TiO2复合涂层,最后对涂层结构和性能进行了表征。涂层结构和形貌分析表明制备的涂层具有微米/纳米复合结构,初始粉体粒径对涂层的结构和致密度影响很小;涂层摩擦学性能测试表明复合涂层的磨损率随初始粉体粒径的增大而减小,初始粉体粒径为100nm左右时,复合涂层的磨损率最低。复合涂层的磨损机制为裂纹扩展导致的磨损剥落。A12O3-30% （mass fraction）TiO2 nanocomposite powders with different particle sizes were synthesized by sol-gel method. The nano-powders were then spray dried, and series of A12O3-TiO2 composite coatings were prepared by plasma spraying using the spray dried powders, the coatings＇ structure was characterized and performance was tested. The analysis results on the morphologies and structures of the composite coatings indicate that the prepared coatings have micro/nano-composite structures and the initial powders＇ particle size has little impact on the coatings＇ structure and densi- ty. The friction and wear properties of the coatings indicate that the wear rate decreases with the increasing of the initial particle size. The micro/nano-composite coating deposited by powder with particle size of 100nm has the minimum wear rate. The wear mechanism of the A12O3-30%TiO2 micro/ nano-composite coating is mainly due to the spalling caused by crack propagation.

关 键 词：等离子喷涂 微米/纳米复合涂层 摩擦磨损 

分 类 号：TG174.442[金属学及工艺—金属表面处理] TQ174[金属学及工艺—金属学]