等离子喷涂Al_2O_3-40%TiO_2陶瓷复合层的微观结构及耐磨性能

Microstructure and Wear Resistance of Plasma Sprayed Al_2O_3-40%TiO_2 Ceramic Composite Coatings

为了探讨不同功率下6063铝合金表面等离子喷涂Al2O3-40%TiO2陶瓷复合层的形貌、组构及其耐磨性能,利用X射线衍射仪(XRD)、扫描电镜(SEM)、显微硬度计和摩擦磨损试验机进行了相关研究。结果表明:微米级Al2O3-40%TiO2粉末经过等离子喷涂可以获得弥散分布的纳米级颗粒的陶瓷复合涂层,涂层硬度在1 000 HV以上;当喷涂功率为25～33 kW时,涂层硬度和耐磨性能随喷涂功率的升高而降低。

Al2O3-40%TiO2 ceramic composite coatings were prepared on the surface of 6063 Al alloy by plasma spraying.The phase composition and microstructure of as-sprayed ceramic composite coatings were analyzed by X-ray diffraction and scanning electron microscopy.A microhardness detection was performed to measure the microhardness of the composite coatings,and the friction and wear behavior of the composite coatings was evaluated with a friction and wear tester.Results show that ceramic composite coatings containing dispersed nanoscale particulates can be prepared on Al alloy surface by plasma spraying micro-scale Al2O3-40%TiO2 powder.As-prepared ceramic composite coatings have a micro-hardness of more than 1 000 HV.The hardness and wear resistance of the composite coatings decrease with increasing spraying power in a range of 25~33 kW.