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ABSTRACT
In our earlier study, epoxy-based composites with graphene (10 wt-%) and in situ liquid fillers (base oil SN150 or perfluoropolyether at 10 wt-%) were found to provide low friction and highly wear durable as thin coatings on the steel substrate in dry interfacial state. In this present work, we have tested this composite in the presence of an external lubricant (base oil SN150). The lowest coefficient of friction was recorded as 0.04 and the lowest specific wear rate was measured as 9.8 × 10−7 mm3 Nm−1 for the composites without any failure of the coating up to 200,000 sliding cycles. It is shown that such polymeric coatings can be an excellent boundary film in both dry and lubricated conditions for various bearings.
Acknowledgements
The provision of research facilities and internal grants by IIT Kanpur and IIT Delhi is gratefully acknowledged by the authors.
Disclosure statement
No potential conflict of interest was reported by the authors.
Notes
1 A normal load of 10 N for EGNSN and EGNPFPE coatings would impose Hertzian maximum stress of 45.9 MPa and 50.7 MPa against a steel ball (4 mm diameter) in dry contact condition. Elastic moduli of steel, EGNSN coating and EGNPFPE are taken as 200 GPa, 0.716 GPa and 0.832 GPa.