阳极氧化铝表面PTFE涂层的离心法制备与其性能的研究  

Study on preparation and performance of composite PTFE anodized self-lubricating film by centrifugation

作　　者：马允赞 陈锟 刘克家 刘琦 MA Yunzan;CHEN Kun;LIU Kejia;LIU Qi(School of Materials Science and Engineering, Shanghai Institute of Technology,Shanghai 201418, China)

机构地区：[1]上海应用技术大学材料科学与工程学院,上海201418

出　　处：《功能材料》2021年第1期1121-1126,共6页Journal of Functional Materials

摘　　要：分别采用离心法和静态浸泡法辅助在阳极氧化铝(6063)表面制备了PTFE涂层,通过金相显微镜、显微硬度计、X射线衍射仪、场发射扫描电子显微镜及EDS面扫描分析、销盘式摩擦磨损试验机、电化学工作站等分析测试手段表征了涂层的微观结构和耐磨、耐腐蚀性能。结果表明,XRD物相证明了PTFE复合成功,与静态浸泡法制备的涂层相比,离心法制备的涂层的厚度为123μm,硬度为512 HV,PTFE颗粒完全沉降表面膜孔内,实现了真正意思上的自润滑膜;摩擦系数下降了55.4%,低频区(10-2 Hz)电阻抗提高2个数量级。摩擦系数降低、耐磨性和耐腐蚀性增强,显著改善了阳极氧化铝表面性能。采用离心法制备的PTFE涂层,能够较致密填充及被覆在多孔氧化膜孔内及表面,且具有高硬度和高耐磨性,同时兼具较高的自润滑性与耐腐蚀性能,本方法制备的铝合金复合自润滑膜具有一定的应用价值和应用前景。On the basis of porous anodic aluminum alloy oxide film,the centrifugation technology was applied to preparation of Al2O3/PTFE composite self-lubricating film in this paper.The Al2O3/PTFE composite film prepared by the centrifugation and the static immersion method were respectively characterized by means of metallographic microscope,microhardness tester,X-ray diffraction,scanning electron microscope,energy dispersive spectroscopy,friction and wear tester,and electrochemical workstation.The results shows that the thickness of the centrifugation prepared Al2O3/PTFE composite film was 123.4μm,the hardness was 512 HV,and that the friction coefficient(average value)was reduced to 0.119,which was 55%lower than that of the composite film prepared by static immersion method.The impedance of the low frequency region(10-2 Hz)was increased about 2 orders of magnitude.It indicates that a compact filled and attached Al2O3/PTFE composite film could be prepared by the centrifugation,which had higher hardness,wear resistance,self-lubrication performance and corrosion resistance.The Al2O3/PTFE composite self-lubricating film prepared by the centrifugation had some application value and prospect.

关 键 词：铝合金 离心法 涂层 自润滑性能 PTFE微粒 

分 类 号：TG174[金属学及工艺—金属表面处理]