Abstract:A systematic experimental investigation was conducted to study the effect of graphene and polytetrafluoroethylene (PTFE) micro powder mixed additives with different weight ratios on the wear behavior of 65Mn spring steel by using CETR UMT2 wear tester.SEM,3Dprofiler and Raman spectra tester were used to observe the morphology of worn scar and analyze the chemical composition,in order to study the wear mechanism of 65Mn spring steel lubricated by PAO4 with the additives of different weigh ratios.The results show that the PAO4 additive mixed by graphene and PTFE micro powder provides a much better performance of friction reducing and antiwear than pure graphene additive.When the weight ratio of graphene and PTFE micro powder is 6∶4,the averaged friction coefficient and wear rate are reduced by 44.3% and 77.75%,respectively,compared with that of pure graphene.The abrasive wear is the major mechanism of 65Mn spring steel when lubricated by PAO4 with the additives of PTFE and graphene.