Abstract
Ionic liquid (IL) combined with 2D materials has evoked considerable attention in the field of lubrication applications because of their speical structure and outstanding lubrication properties. However, the ambiguous effect of the 2D materials on the friction and anti-wear properties of the IL needs futher study. Here, we have obtained two families of IL composite films with additives of MoS and graphene via a combined process of spin-coated and curing, and the distinction of the effects of two additives on the tribological performance of the IL films was studied. The friction tests showed that the friction coefficient and anti-wear life of the IL films were greatly enhanced after the addition of MoS or graphene, which could be attributed to the improved load-carrying capacity and the second lubrication phase. Under a low addition content, graphene had more advantages to reduce the friction of the films, and MoS was more beneficial to the tribological properties with the additional content increased. The films with low friction and good anti-wear properties may be valuable for the rational design of lubrication films for the practical engineering applications.
Highlights
Industrial equipment and devices are in constant motion, but the severe wear and interfacial adhesion have become great challenges for the moving and contact parts in the mechanical moving equipment [1,2,3]
Combining the results reported in the previous work, the ionic liquids (IL) composite film with MoS2 content increased to 0.3 wt%, and the anti-wear life of the composite film of IL/0.3M
A series of IL based composite films composed of IL and Two-dimensional materials (TDMs) (MoS2 or graphene) were obtained and the tribological properties of the composite films were studied
Summary
Industrial equipment and devices are in constant motion, but the severe wear and interfacial adhesion have become great challenges for the moving and contact parts in the mechanical moving equipment [1,2,3]. Based on the current reports, it has been supposed that the IL film could be used as a kind of important lubricant to reduce the friction and improve the anti-wear for the moving parts [6,11,12]. For the past few years, a lot of additives have been reported to enhance the tribological performance of IL with low friction coefficient and improved anti-wear ability [14,15,16,17]. Two-dimensional materials (TDMs), such as graphene and molybdenum disulfide (MoS2 ), with outstanding anti-wear and ultralow friction coefficient, have become attractive solid lubricants to be used as additives to enhance a lubricating property of mechanical components [18,19,20,21]
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