液相介质中脉冲放电制备(Ti, Al)C涂层及其高温磨损性能研究
Study on Preparation of Ceramic Coating by Pulse Discharge in Liquid Medium and Its Wear Resistance at High-temperature
何 玲, 揭晓华, 陈 磊, 卢国辉
作者单位：(广东工业大学 材料与能源学院, 广东 广州 510006)
中文关键字：(Ti，Al)C陶瓷涂层； 耐磨性； 磨损机理
英文关键字：(Ti, Al) C ceramic coating; wear resistance; wear mechanism
中文摘要：将Ti、Al按一定比例混合压制烧结成电极，置于含碳的液相介质中，利用脉冲放电所产生的低温高能等离子体在45钢基体上沉积(Ti，Al)C硬质金属陶瓷涂层；并对涂层进行高温磨损试验。结果表明：试验温度高于200 ℃时， 涂层的摩擦系数随温度的升高而降低；观察涂层磨损形貌发现，低温时，磨痕为平行犁沟，表明涂层的磨损机理为磨粒磨损；高温时，犁沟比室温时浅且表面有氧化物，其磨损机理为轻微磨粒磨损和氧化磨损。
英文摘要：The electrodes prepared by sintering Ti and Al suppressed in a certain percentage were placed in liquid medium containing carbon. And then a hard metal-ceramic coating was deposited on the surface of 45 steel by pulse discharge generated by high energy plasma, the wear resistance was tested with a high-temperature wear device. The results show that the friction coefficient of the coating decreases with the increase of temperature, when the test temperature is higher than 200 ℃. The wear scar is parallel furrow when temperature is low, which indicates that the wear mechanism of the coating is abrasive wear. The furrow is more shallow than that at room temperature, moreover, some oxides exist on the surface at high temperature. The wear mechanism is mild abrasive wear and oxidation wear.