▎ 摘　　要

Graphene oxide (GO) and anatase TiO2 are tried as lubricating additives for nanofluids due to their unique structure and physical properties. In this article, anatase TiO2 modified GO (GO-TiO2) have been synthesized via an improved and facile solvothermal method. The physical and chemical properties of as-prepared samples were characterized by means of X-ray diffraction, Fourier transformed infrared spectra, Raman spectra and transmission electron microscopy. The tribological properties and rolling lubrication performance of the control group and 0.5 wt% of GO, TiO2, GO + TiO2, GO-TiO2 nanofluids were investigated using a four-ball tribometer and two-high rolling mill. The microscopic morphologies of the rolled strips were measured and analyzed by a series of physical characterizations. The results showed that spherical TiO2 was successfully anchored on GO nanosheets. 0.5 wt% of GO-TiO2 nanofluid had excellent friction reducing and wear resistance. It had the largest film thickness and was nanoscale (28.07 nm). And the rolled strip lubricated by 0.5 wt% of GO-TiO2 nanofluid had few defects and minimal roughness. The superior lubricating properties of GO-TiO2 nanocomposites were attributed to the excellent dispersion stability and the formation of absorption films, carbonaceous protective films and transfer films. (C) 2018 Elsevier Ltd. All rights reserved.