Abstract

In consideration of high temperature conditions, this paper focuses on the self-lubricating properties of WS₂ coatings at high temperature. A low coefficient of friction (CoF) about 0.07–0.2 for WS₂ coatings can be attained at temperatures of 100–400 °C. The chemical stability, mechanical and tribological properties were investigated by energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), nano-indentation tester and ball-on-disk tribometer, respectively. According to XRD and XPS spectra, the as-sputtered WS₂ coatings existed as 2 h-WS₂ structure. The crystal transition of WS₂ coatings from amorphous to (002) basal plane-oriented lubricating film, which was obtained by the synergistic effect of load and friction, and provided anti-friction performance at 100–400 °C. At 500 °C, the WO₃ formed by oxidation of WS₂ on the sample surface with lower hardness reduces the CoF and improves wear resistance. The wear resistance and anti-friction performance are discussed in terms of morphology of the wear scars, anti-oxidation capability of the coating and tribochemical reaction product of the friction pair.

Graphical Abstract

中文翻译：

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磁控溅射WS 2涂层的纳米结晶驱动高温自润滑性能

摘要

考虑到高温条件，本文重点研究了WS ₂涂层在高温下的自润滑性能。在100–400°C的温度下，对于WS ₂涂层，可以获得约0.07–0.2的低摩擦系数（CoF）。通过能量色散X射线光谱（EDS），X射线衍射（XRD），X射线光电子能谱（XPS），扫描电子显微镜（SEM），纳米压痕测试仪研究了化学稳定性，机械和摩擦学性能和圆盘摩擦计。根据XRD和XPS光谱，溅射的WS ₂涂层以2 h-WS ₂结构存在。WS ₂的结晶过渡从无定形到（002）基面取向的润滑膜的涂层，这是通过载荷和摩擦的协同作用而获得的，并在100–400°C时具有抗摩擦性能。在500°C下，由WS ₂在较低硬度的样品表面上氧化而形成的WO ₃降低了CoF并提高了耐磨性。根据磨损痕迹的形貌，涂层的抗氧化能力和摩擦副的摩擦化学反应产物，讨论了耐磨性和减摩性能。

图形概要