▎ 摘　　要

In this work, graphene nanoplatelets have been synthesized using liquid phase exfoliation of graphite flake powder. The exfoliated graphene nanoplatelets were identified and characterized by using UV-Visible-NIR spectroscopy, High resolution transmission electron microscopy, electron diffraction, scanning electron microscopy and X-ray diffraction. The obtained graphene nanoplatelets and nano alumina at various weight ratios were dispersed in an epoxy matrix to enhance the surface roughness (R-a), micro hardness (H-v) and coefficient of friction (CoF) of epoxy hybrid nanocomposites. The results showed that the R-a and CoF value for the combined loading of 0.2 wt% of graphene nanoplatelets and 0.8 wt% of alumina into the epoxy was decreased to 41.02 and 20.01% whereas, the H-v value was increased to 10.04% when compared with the neat epoxy. The improved mechanical and tribological behaviors are suitable for the applications bearing and coating.