PDF(Pubmed)
Abstract：
Ionic liquid (IL) combined with graphene additives have garnered extensive attention in the field of high-performance lubricating materials. However, the ambiguous mechanism of graphene influencing the load-carrying and anti-wear capacity of ILs needs further study. In this work, friction simulation shows that adding graphene causes friction coefficient to reduce by up to 88% compared with pure ILs, but lubrication performance is lost due to the destruction of graphene under high stress. Meanwhile, multilayer graphene has better friction-reducing performance and friction durability as compared to the monolayer structure, which is attributed to the easy-shear property and the reduction in the percentage of high tensile stress sites in multilayer graphene structure. In addition, it was found that excessively thick ILs film would form a three-body abrasive wear structure with graphene, which accelerated the structural destruction of graphene and caused a decline in its tribological properties. It is believed these findings can be valuable for designing of high-performance lubricating oil for practical engineering.
摘要：
离子液体与石墨烯添加剂的结合在高性能润滑材料领域得到了广泛的关注。然而,石墨烯影响ILs承载和抗磨损能力的模糊机理有待进一步研究。在这项工作中,摩擦模拟表明，添加石墨烯导致摩擦系数降低高达88%，与纯IL相比，但由于石墨烯在高应力下的破坏，润滑性能丧失。同时,与单层结构相比，多层石墨烯具有更好的减摩性能和摩擦耐久性，这归因于多层石墨烯结构中的易剪切性质和高拉伸应力位点百分比的减少。此外,研究发现，过厚的ILs膜会与石墨烯形成三体磨料磨损结构，这加速了石墨烯的结构破坏，并导致其摩擦学性能下降。相信这些发现对于设计用于实际工程的高性能润滑油具有一定的参考价值。
