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In Situ Friction-Induced Graphene Originating from Methanol at Sliding Interface between the WC Self-Mated Tribo-Pair and Its Tribological Performance.

Alcohols were reported superlubricity at low loads during sliding, however, there were rarely reported on their lubricity under high loads, meanwhile, the lubrication mechanism of them under high loads was still not well understood. Here, we first reported the lubricity of methanol under 98 N and 1450 rpm and demonstrated the formation of graphene and fullerene-like nanostructures induced by tribochemical reactions. Results showed that the lubrication mechanism was mainly attributed to the friction-induced graphene under boundary lubrication condition. Besides, the wear rate of YG8 hard alloy ball mainly occurred at the run-in processes, the friction-induced graphene effectively inhibited the further wear after run-in processes. The formation mechanism of graphene was well investigated, the flash temperature rise and catalyst (WC, WO2 and WO3) was the major causes for the formation of graphene.