h-BN/Si_(3)N_(4)增强聚四氟乙烯复合涂层的摩擦磨损性能  

Friction and Wear Property of Polytetrafluoroethylene Composite Coating Reinforced with h-BN/Si_(3)N_(4)

作　　者：郭永信 周红成 汪磊 GUO Yongxin;ZHOU Hongcheng;WANG Lei(College of Automation,Wuxi University,Wuxi,Jiangsu 214105,China;College of Mechanical Engineering,Jiangnan University,Wuxi,Jiangsu 214122,China)

机构地区：[1]无锡学院,自动化学院,江苏无锡214105 [2]江南大学,机械工程学院,江苏无锡214122

出　　处：《塑料》2022年第5期71-75,86,共6页Plastics

基　　金：南京信息工程大学滨江学院人才启动经费(550221004);江苏省自然科学基金(BK20190611);中国博士后基金(2020M681482)。

摘　　要：以5052铝合金为基体材料,采用喷涂工艺制备了不同质量比的六方氮化硼/氮化硅(h-BN/Si_(3)N_(4))增强聚四氟乙烯(PTFE)复合涂层。采用MFT-5000型摩擦磨损试验机对复合涂层进行测试,并通过三维形貌仪以及扫描电子显微镜(SEM)分析涂层磨损表面形貌。结果表明,当h-BN/Si_(3)N_(4)的质量比为1∶1.5时,复合涂层的摩擦因数最低,与纯涂层相比,降低了21.9%。当h-BN/Si_(3)N_(4)的质量比为1.5∶0.5时,摩擦因数降低了18.9%。但是,涂层硬度达到最大值,同时磨损量达到最小值,其值为1.26×10^(8)μm^(3),与纯涂层相比,降低了83.3%。由于h-BN的自润滑性,其涂层摩擦因数降低;而且能够吸收在磨损过程中产生的应力,可避免裂纹萌生或填充物脱落。而涂层中添加Si_(3)N_(4)提高了涂层的显微硬度和抵抗塑性变形能力,从而提高了涂层的耐磨性。同时,Si_(3)N_(4)充当刚性支撑点,避免了h-BN和PTFE的磨损。因此,h-BN和Si_(3)N_(4)的协同作用有效地提高了PTFE涂层的摩擦学性能。Polytetrafluoroethylene(PTFE)composite coating reinforced with different mass ratios of h-BN/Si_(3)N_(4) was deposited on the 5052 aluminum alloy substrate by spraying technique.MFT-5000 friction and wear tester was used to test the tribological properties of the composite coating,and the morphology of the wear surface was analyzed by three-dimensional profiler and scanning electron microscope(SEM).The results showed that the composite coating shows the lowest friction coefficient when the mass ratio of h-BN/Si_(3)N_(4)is 1∶1.5,which was 21.9%lower than the pure coating.When the mass ratio of h-BN/Si_(3)N_(4)was 1.5∶0.5,the friction coefficient was reduced by 18.9%.However,the hardness of the coating reached the highest,and the wear volume was the lowest,which was 83.3%lower than the pure coating.Due to the self-lubricating property of h-BN,the friction coefficient of the coating was reduced.And it could prevent the appearance of cracks or the falling of fillers by absorbing the stress generated during the wear process.However,Si_(3)N_(4) could increase the microhardness and resistance to plastic deformation of the coating,thereby improving the wear resistance of the coating.Besides,Si_(3)N_(4) acts as a rigid support point to avoid the wear of h-BN and PTFE.The synergistic effect of h-BN and Si_(3)N_(4) could effectively improve the tribological properties of PTFE composite coating.

关 键 词：聚四氟乙烯 硬度 摩擦因数 磨损量 协同作用 

分 类 号：TQ325.4[化学工程—合成树脂塑料工业]