为了拓展所制备的镍基自润滑耐磨复合涂层的应用领域,基于前期研究基础,在HT-1000型高温摩擦磨损试验机研究涂层在300℃不同载荷下的摩擦磨损行为,利用SEM和EDS对磨损表面进行了形貌观察与成分分析,研究其摩擦磨损机理。结果表明：该复合涂层的摩擦系数及磨损率都随着载荷的增大呈现先减小后略增大的趋势;当载荷较低（2 N）时,涂层的磨损表面出现少量分散的磨屑;在中等载荷（5 N）下,磨损表面光滑平整,涂层中的润滑颗粒被挤压出磨损表面形成润滑膜,导致涂层具有良好摩擦磨损性能;随着载荷的增大,达到10 N时,磨损表面出现犁沟及部分由于硬质相碳化物和润滑颗粒剥落而形成的凹坑。
Based on our previous study,dry sliding wear behavior of Ni-based self-lubricating wear-resistant coating was characterized on a HT-1000 ball-on-disc tester under various loads at 300 ℃ for expanding its application fields.Morphology and composition of the worn surface were analyzed by scanning electron microscopy(SEM) attached with energy dispersive spectrometer(EDS),and the corresponding wear mechanisms were discussed.The results show that with the increase of load,both the frictional coefficient and wear rate decrease firstly,then slightly increase.A small amount of debris disperses on the worn surface of the coating under low load(2 N).Due to the effects of oxide layer and lubricant particles spreading out onto the worn surface,the coating exhibits superior friction and wear properties under moderate load(5 N).As the load further increases up till 10 N,the worn surface appears some shallow grooves and craters owing to the spalling of carbides and lubricanting particles.
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