This study is aimed towards a better understanding of the tribological performance of the optimized Mo-Se-C dry lubricant coatings. The coatings are deposited with a lower carbon content (< 30 at. %), as compared to the literature. The detailed analysis of the wear track and the tribolayer evolution as a function of the C content and the number of sliding cycles is discussed, using Raman spectroscopy, scanning electron microscopy (SEM) and high-resolution transmission electron microscopy (HRTEM) analyses. The coatings are highly compact, homogeneous, with (002) basal planes parallel to the surface as observed by X-ray diffraction (XRD) studies. In unidirectional tests, under ambient conditions, the friction coefficient and the specific wear rate decrease with the number of sliding cycles. After 25,000 cycles, the wear tracks are not fully covered with MoSe₂ tribolayer, instead displayed zones of the tribolayer as well as the as-deposited coating. After 100,000 cycles, the wear track is covered by a thick MoSe₂ tribolayer. Scanning-TEM (STEM) chemical composition mapping also confirms that MoSe₂ tribolayer is dominating during sliding in ambient air. Reciprocating sliding tests are also performed in ambient air, dry N₂, and at 200 °C. The transition metal dichalcogenide (TMD) phase is always governing the low friction, with coatings not showing the chameleon behavior claimed in the literature for C-containing TMD coatings.

这项研究旨在更好地了解优化的Mo-Se-C干润滑剂涂层的摩擦学性能。与文献相比，所沉积的涂层具有较低的碳含量（<30 at。％）。使用拉曼光谱，扫描电子显微镜（SEM）和高分辨率透射电子显微镜（HRTEM）分析对磨损轨迹和摩擦层随C含量和滑动循环次数的变化进行了详细分析。通过X射线衍射（XRD）研究发现，涂层高度致密，均匀，具有（002）基本面平行于表面。在单向测试中，在环境条件下，摩擦系数和比磨损率会随着滑动循环次数的增加而降低。经过25,000次循环后，_2个摩擦层，显示摩擦层的区域以及沉积的涂层。100,000次循环后，磨损轨迹被厚厚的MoSe ₂摩擦层覆盖。扫描TEM（STEM）化学成分图谱也证实了MoSe ₂摩擦层在环境空气中滑动过程中起主导作用。往复滑动试验也在环境空气，干燥N ₂和200°C下进行。过渡金属二硫化氢（TMD）相始终控制着低摩擦，而涂层并未表现出文献中声称的含C TMD涂层的变色龙行为。