等离子喷涂MoS2/Cu基复合涂层真空摩擦磨损性能

摘要

以MoS2/Cu复合粉体为原料,采用等离子喷涂技术在2A12铝合金基体上制备MoS2/Cu基复合涂层.运用扫描电镜、能谱、X射线衍射、拉曼光谱等手段对涂层显微结构、磨损表面进行表征,并利用GTM-3E球盘式真空摩擦磨损仪探讨真空环境下MoS2/Cu基复合涂层的摩擦行为.结果表明:MoS2颗粒均匀分布于涂层中;涂层结构比较致密且与铝基体结合牢固;XRD分析表明复合涂层物相组成主要为Cu,MoS2相及Cu2O相.实验条件下复合涂层表现出优异的真空减摩效果,涂层的真空摩擦因数在0.05～0.15之间.真空磨损过程中,MoS2自润滑膜层的形成是涂层低摩擦因数的主要原因;真空磨损机理主要表现为疲劳磨损和脆性断裂.%MoS2/Cu composite coating was deposited by air plasma spraying on 2A12 aluminum alloy substrate using MoS2/Cu composite powder as raw material.Microstructure and wear surface of coating were characterized by scanning electron microscopy (SEM),energy dispersive spectrometer (EDS),X-ray diffraction (XRD) and Raman spectra.The tribological properties of as-sprayed coating in vacuum were explored using GTM-3E ball-on-disc vacuum friction and wear instrument.The results showed that MoS2 particles were homogeneously distributed in the as-sprayed coating.The as-sprayed coating was dense and had good bonding with aluminum matrix.XRD analysis demonstrated that Cu,MoS2 and Cu2O phase were observed.Under the test conditions,the as-sprayed coating exhibited excellent friction reducing effect through the addition of MoS2 component,the obtained friction coefficients were in the range from 0.05 to 0.15.The low friction coefficient could be attributed to the formation of uniform MoS2 lubricating transfer film.The main wear mechanisms observed in vacuum were fatigue wear and brittle fracture.