首页|Tribological properties and self-lubrication mechanism of in-situ grown graphene reinforced nickel matrix composites in ambient air
Tribological properties and self-lubrication mechanism of in-situ grown graphene reinforced nickel matrix composites in ambient air
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NSTL
Elsevier
In situ synthesis of graphene reinforcements in Ni matrix is a promising strategy to manufacture graphene/Ni composites for advanced lubrication. However, the influence of in situ grown graphene content on the tribological properties and the lubricating mechanisms of the graphene/Ni composites under ambient air are far from clear. According to the dissolution and precipitation of carbon on Ni grain surface, this paper reports a high-quality graphene/Ni self-lubricating composite synthesized by in situ powder metallurgy process. The micro-structure and tribological behaviours of the composites with different graphene content are elaborated. It is found that the in situ grown few-layer graphene can induce a significant grain refinement effect and simultaneously achieve excellent anti-friction and wear performances. The lowest friction coefficient and wear rate of 0.254 and 4.385 × 10~(-5) mm~3/(N·m) are obtained by the graphene/Ni composite with 0.6 wt% carbon. In comparison with pure Ni, the friction coefficient and wear rate are reduced by 3.02-fold and 3.44-fold, respectively. The tribological improvements of the presented graphene/Ni composite is related to the high H/E ratio and homogenous dispersion of graphene nanosheets.
NSTL
Elsevier
