Diamond-like carbon coating under oleic acid lubrication: Evidence for graphene oxide formation in superlow friction.

ABSTRACT: The achievement of the superlubricity regime, with a friction coefficient below 0.01, is the Holy Grail of many tribological applications, with the potential to have a remarkable impact on economic and environmental issues. Based on a combined high-resolution photoemission and soft X-ray absorption study, we report that superlubricity can be realized for engineering applications in bearing steel coated with ultra-smooth tetrahedral amorphous carbon (ta-C) under oleic acid lubrication. The results show that tribochemical reactions promoted by the oil lubrication generate strong structural changes in the carbon hybridization of the ta-C hydrogen-free carbon, with initially high sp³ content. Interestingly, the macroscopic superlow friction regime of moving mechanical assemblies coa

SUBMITTER: De Barros Bouchet MI 

PROVIDER: S-EPMC5388889 | biostudies-literature | 2017 Apr

REPOSITORIES: biostudies-literature