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中文摘要：
采用溶胶-凝胶法合成了不同粒径的A12O3-30％（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A12O3-30／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。
英文摘要：
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.
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