Abstract
Nanocarbon products and graphene derivatives are often applied to base lubricants as an additive to reduce contact-induced surface failures and improve the reliability of engineering applications. In this study, the effects of modified graphene oxide (MGO) on the lubricity of the ionic liquid (IL), 1-heptyl-3-methyl imidazolium bis[(trifluoromethane)sulfonyl]amide ([C7C1im][NTf2]), are investigated through systematic experiments and material characterizations. To enhance the stability of the dispersion of GO in the IL [C7C1im][NTf2] lubricant, 1-butyl-3-(9-carboxynonyl)imidazolium bromide (ILC9-COOH) is covalently grafted onto GO, which produces ILC9-COOH-modified graphene oxide (MGO). The synthesized MGO/IL lubricant is applied to the sliding contact between the stainless steel ball and the bearing steel plate. The measured friction and wear are analyzed with respect to the MGO concentration and temperature. The experimental results support that MGO is an effective additive to the IL [C7C1im][NTf2] lubricant in decreasing the friction, and its benefit is more obvious at the higher temperature. From the analysis of the 3D surface profilometer and scanning electron microscopy (SEM) measurements, it is found that the abrasive type of wear is dominant on the worn surface. If the MGO concentration is appropriately controlled, MGO additive can be beneficial in decreasing the wear at the higher temperature.
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