Graphene oxide (GO) exhibits good hydrophilicity and chemical harmonizability attributed to its extensive oxygen-containing functional groups, thereby conferring superior lubrication and wear reduction characteristics in water lubrication systems. In this study, a composite coating of graphene oxide/ionic liquids (GO/ILs) was prepared using impregnation and ultrasonic spraying techniques. The influence of GO, ILs on the lubrication and wear reduction characteristics of silicon carbide (SiC) was studied. Additionally, the coefficient of friction (COF), wear characteristics, and triboelectric characteristics of water-lubricated SiC interface were studied through alterations in speed and load. It was found that the GO/ILs composite coatings effectively enhanced friction lubrication properties by increasing the open-circuit voltage at the liquid-solid interface, thereby strengthening the mutual repulsive polarization electric field. Notably, the GO/ILs composite coating consistently delivered continuous and stable lubrication across a broad speed range under the combined support of ILs and the friction voltage effect. When the load exceeded 80 N, the COF for SiC with the GO/ILs composite coating consistently remained below 0.02 throughout the friction process. Remarkably, the COF of GO/ILs composite coating exhibited a substantial reduction of 92.36 % in comparison to uncoated SiC under conditions of 120 N and 1200 r/min. It was further revealed that the improved tribological properties of the GO/ILs composite coatings stemmed from the combined effect of the in-situ GO friction film, self-lubricating properties of GO, and coupled effect of the polarized electric field at the interface.

中文翻译：

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氧化石墨烯/离子液体复合涂层的润滑减磨特性

氧化石墨烯（GO）由于其广泛的含氧官能团而表现出良好的亲水性和化学协调性，从而在水润滑系统中赋予优异的润滑和减少磨损的特性。在这项研究中，采用浸渍和超声波喷涂技术制备了氧化石墨烯/离子液体（GO/IL）复合涂层。研究了GO、ILs对碳化硅（SiC）润滑和减磨特性的影响。此外，通过改变速度和负载，研究了水润滑 SiC 界面的摩擦系数 (COF)、磨损特性和摩擦电特性。结果发现，GO/ILs复合涂层通过提高液固界面开路电压，从而加强相互排斥的极化电场，有效增强摩擦润滑性能。值得注意的是，GO/ILs 复合涂层在 ILs 和摩擦电压效应的共同支持下，在广泛的速度范围内始终如一地提供连续、稳定的润滑。当负载超过 80 N 时，具有 GO/ILs 复合涂层的 SiC 的 COF 在整个摩擦过程中始终保持在 0.02 以下。值得注意的是，在 120 N、1200 r/min 的条件下，GO/ILs 复合涂层的 COF 与未涂层的 SiC 相比显着降低了 92.36%。进一步揭示GO/ILs复合涂层摩擦学性能的改善源于原位GO摩擦膜、GO自润滑性能以及界面极化电场耦合效应的综合作用。