Abstract
Abstract
The study, presented in this paper, aims to shed some light on the effect of deposited polytetrafluorothylene (PTFE) on the tribological performance of Al bronze and Mo coatings in rolling/sliding contact conditions by using a two-disc machine.
The experimental results revealed that both PTFE-Al bronze and PTFE-Mo coatings had outstanding wear and surface fatigue resistance. Although PTFE-Al bronze coatings had relatively better wear behaviour than PTFE-Mo coatings under both pure rolling and rolling/sliding conditions, both coatings had no significant surface damage after 1.2 × 106 load cycles. Optical microscopy and scanning electron microscopy studies suggest that metallic asperities in the coating matrix acted as the load carrier. PTFE was lost by an adhesive wear due to transfer film formation on the counter steel surface, which in turn provided good lubrication of the contact zone.
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