▎ 摘　　要

To evaluate the potential lubricating properties of graphene oxide (GO) as an oil additive, the tribological behaviors of Si3N4/GCr15 sliding pairs lubricated with Mobil DTE oil light (MDOL) containing different GO concentrations (0-0.3 wt%) were investigated with a ball-on-disc tribometer. The wear scar widths (WSWs) of the GCr15 discs were characterized via digital 3D microscopy. Scanning electron microscopy, energy-dispersive x-ray spectroscopy, and Raman spectroscopy were employed to investigate the lubricating mechanism of the base oil containing the GO additive. The frictional properties of the Si3N4/GCr15 sliding pairs were significantly improved after adding GO into the base lubricating oil, and a good cooling effect was observed. For MDOL containing 0.15 wt% GO at a rotational speed of 2500 r.min(-1) and 80 N load, the average friction coefficient (AFC) was reduced by 67.37%. For MDOL containing 0.15 wt% GO at a rotational speed of 2000 r.min(-1) and 80 N load, the temperature rise (TR) and WSW were decreased by 39.86% and 28.37%, respectively. The lubrication mechanism was studied to explain the improvements in the AFC and WSW, which were attributed to the formation of a protective deposited film. The decrease in the TR for the Si3N4/GCr15 sliding pairs was ascribed to the high thermal conductivity and large specific surface area of the GO additive.