本文利用环块磨损试验机在不同载荷下对热喷涂Al_2O_3-TiO_2复合陶瓷涂层的滑动磨损特性进行了研究,结果表明热喷涂Al_2O_3-TiO_2复合陶瓷涂层干摩擦和水润滑时的磨损量均随载荷的增加而增大.利用扫描电镜观察了磨损表面形貌并用能谱分析了磨损表面成分,结果表明干摩擦情况下在低载和高载时其磨损机理有所不同:低载时主要为钢轮对涂层的涂抹及陶瓷涂层的剥落,高载时主要为陶瓷涂层的断裂剥落;水润滑情况下的磨损机理与低载干摩擦时相类似,主要为涂抹及剥落. In this paper, the sliding abrasion characteristics of thermal sprayed Al 2 O 3 -TiO 2 composite ceramic coatings were studied by ring-block abrasion testing machine under different loads. The results show that the wear of thermal sprayed Al 2 O 3 -TiO 2 composite coatings are both dry and water-lubricated The surface morphology of the wear surface was observed by scanning electron microscopy and the wear surface composition was analyzed by energy spectrum.The results show that the wear mechanism of the wear surface is different under low load and high load under dry friction condition: The application of steel to the coating and ceramic coating spalling, high load mainly ceramic coating fracture spalling; water lubrication mechanism of wear and dry loading under low load is similar to the main smear and peeling.