Tribological Properties and Interfacial Electrical Stability of Graphene/lonic Liquid Composites in Current-Carrying Conditions
In this study,a new type of lubricant additive,a graphene/ionic liquid(G/IL)composite by non-covalent modi-fication of graphene and ionic liquid,was prepared.Current-carrying friction experiments were operated in a multifunctional tribometer,and the effects of the additive on lubrication performance and electrical stability of lubricants were assessed when adding polyalpha-olefin 40 base oil.The results show that the friction coefficient increases significantly under the ac-tion of electric current and continues to rise with increase of current intensity.Compared to pure polyalpha-olefin 40,gra-phene and ionic liquid lubricants,the graphene/ionic composite has a better friction performance,which is mainly attributed to the synergistic effect between graphene and the ionic liquid.Additionally,the real-time contact resistance data obtained in an external voltage collection device provides a support for analyzing the correlation between friction coefficient and con-tact resistance,confirming the effectiveness of synergistic action.This study provides an insight into the lubrication mecha-nism of the graphene/ionic composite under current-carrying conditions and promotion of their application in tribology.
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