Preparation of graphene‐loading copper nanoparticles by freeze drying and its tribological properties

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Abstract
To reduce the agglomeration of graphene and improve the synergistic friction‐reducing and anti‐wear action of graphene loading copper, one‐step preparation of reduced graphene oxide/copper(RGO/Cu) nanoparticles by freeze‐drying method was used, the influence of process parameters on particles size of RGO/Cu is studied by orthogonal experiments. The microstructures of RGO/Cu nanoparticles are characterized by SEM and AFM, and the tribological properties of RGO/Cu nanoparticles are studied on a tribometer. The results show that the purity of RGO/Cu nanoparticles prepared by freeze‐drying was higher, and the copper nanoparticles 100–200 nm are uniformly attached to the graphene surface. It was found that RGO/Cu nanoparticles have better friction reduction and anti‐wear properties than graphene mono‐agent as lubricant additive. The synergistic anti‐friction and anti‐wear performance are better at the addition of 0.10 wt% for RGO/Cu nanoparticles. Compared with the base oil, the friction coefficient decreases by 23.1%, and the width of wear scar decreases by 62.5%.
Funding Information
  • National Natural Science Foundation of China (52175113)

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