Microtribological performance of Au-MoS_2 nanocomposite and Au/MoS_2 bilayer coatings
Microtribological performance of Au-MoS_2 nanocomposite and Au/MoS_2 bilayer coatings
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DOI：
10.1016/j.triboint.2012.03.014
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发表时间：
2012-08
期刊：
影响因子：
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通讯作者：
P. Stoyanov
中科院分区：
文献类型：
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作者：
P. Stoyanov
利用纳米压痕仪在干燥空气中对纯金、双层Au/MoS_2和共溅射Au-MoS_2进行了划痕试验、往复微磨损试验和扫描磨损试验。比较了这些不同的润滑策略(即纳米复合材料和双层涂层)的机械性能、摩擦系数和磨损行为。用扫描电子显微镜(SEM)、显微拉曼光谱仪和原子力显微镜(AFM)对磨痕进行了非原位表征。结果表明，与纯金相比，纳米复合Au-MoS2涂层的耐磨性提高，其原因是硬度增加，表面附着力降低。同样，对于Au/MoS2双层样品，MoS2顶层作为牺牲层保护Au，提高了Au膜的耐磨性。
Scratch tests, reciprocating microwear, and scanning wear tests were performed on pure Au, bilayer Au/MoS2, and co-sputtered Au–MoS2using a nanoindentation instrument in dry air. These different lubrication strategies (i.e. nanocomposite and bilayer coatings) were compared in terms of mechanical properties, friction coefficient, and wear behavior. The results were correlated to the tribofilm formation, which was analyzed using ex situ characterization of the wear track with a Scanning Electron Microscope (SEM), micro-Raman spectrometer, and an atomic force microscope (AFM). It was observed that the nanocomposite Au–MoS2coatings increased the wear resistance compared to pure Au films, which was explained by the increase in hardness values and the decrease in surface adhesion forces. Similarly for bilayer Au/MoS2samples, the wear resistance of the Au film was enhanced by the MoS2top layer, which behaved as a sacrificial layer protecting the Au.