▎ 摘　　要

Tribological characteristics of pure poly(methyl methacrylate) (PMMA) reinforced with nano graphene and hybrid dioxides nano particles, SiO2 - TiO2, with weight fraction of 0.2%, 0.4%, 0.6%, 0.8% and 1% were investigated. Durometer device, Shore D, is used to measure the hardness. Friction and wear of composites is examined on the reciprocating tribometer. Based on the experiments, it can be concluded that hybrid of the nano dioxides NH-NG-PMMA composite gives the best tribological characteristics. The minimum weight loss ratio is observed by adding hybrid dioxides of 0.4 wt.%. In addition, the hardness of the nanocomposite increases by 18% more than pure PMMA.