Abstract
Achieving good dispersion stability of graphene oxide (GO) nanosheets in lubricants remains a challenge due to its inherent nature. Here, the isopropyl triisostearyl titanate modified graphene oxide (T-GO) was prepared for improving its dispersion stability in hydraulic oil via a simple method, and for further enhancing the tribological behaviors. The chemical and structural features of T-GO illustrate that the titanate coupling agent (T) was successfully grafted on the plane or interlayer of GO via the interaction between T and hydroxy. The high dispersibility of T-GO in hydraulic oil was demonstrated by the sedimentation experiment and UV–vis absorption spectra (good stability and no sedimentation after 30 days). The 0.08 wt% T-GO hybrid hydraulic oil displayed excellent extreme pressure performance (load carrying capacity raises at least 400 N), friction reduction (friction cofficient reduces by nearly 50%) and wear resistance (wear volume decreases by about 20%). The surface/interface analysis on the worn surfaces testified the formation of graphene-based tribo-film on the contact interfaces. Hence, the excellent lubrication function of T-GO hybrid hydraulic oil was attributed to not only high dispersion stability of T-GO, but also the formation of graphene-like tribo-film, thereby reducing the friction and protecting the tribo-interfaces against wear.
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