Al2O3—40%TiO2和Cr2O3等离子喷涂层的摩擦磨损特性

研究了AC4C铸铝合金表面等离子喷涂Al2O3-40%TiO2和Cr2O3陶瓷粉末涂层的滑动摩擦磨损特性;采用划痕试验方法测定了涂层与基体之间的结合强度;用扫描电子显微镜观察分析了磨痕形貌和涂层显微组织特征.研究结果表明:Cr2O3涂层的摩擦学性能优于Al2O3-40%TiO2涂层;涂层的结合强度、硬度和表面空隙对磨损影响较大;Al2O3-40%TiO2涂层的磨损机理主要表现为塑性变形和层状剥离;而Cr2O3涂层则主要为磨粒磨损

Friction and Wear Characteristics of Plasma sprayed Al 2O 3 40%TiO 2 and Cr 2O 3 Coatings on Aluminum Alloy

The wear characteristics and wear mechanisms of plasma sprayed Al 2O 3 40%TiO 2 and Cr 2O 3 coatings on casting aluminum alloy (AC4C) were investigated. The bonding strength between the substrate and the coating was measured by scratch tester. The profile of worn coating surface and microstructure of the coatings were observed with SEM. The wear mechanism is discussed as well. The experimental results indicate that the wear resistance of Cr 2O 3 coating is greater than that of Al 2O 3 40%TiO 2 coating. The friction coefficient of Cr 2O 3 coating in sliding against SiC ceramic ball is lower than that of Al 2O 3 40%TiO 2 coating against the same counterface. It has also been found that the bonding strength, voids and porosities of the coating surface govern the friction and wear properties of the coatings. The wear mechanism of Al 2O 3 40%TiO 2 coating is mainly plastic deformation and delamination, whereas that of Cr 2O 3 coating is abrasive wear.