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PTFE/Pyrroline and no obvious transfer film in the case of the PEEK/PTFE film. Note that in the case of PEEK/PTFE there appears to be some spotty transfer films on the valleys of the machining marks of the pin surface, which are not effective under sliding conditions, as the rubbing surface (surface peaks) are bare exposing metal-to-metal contact. Such transfer film formation has also been documented in the case of bulk polymers in contact with a metal counterpart (Wang and Yan, 2007 and Bahadur and Schwartz, 2008). In the present study, it was found that the tribological performance of the polymeric coatings was greatly influenced by the ability of each coating to form a stable and continuous transfer film on the counterface. 6.3.2.2 Mechanism of transfer film Understanding the mechanism of transfer film formation on the metal counterface will enable us to design better coating systems for improved tribological performance. In general, material transfer of soft polymeric coatings to metal counterface (pin surface) could be attributed to the coupled effects of chemical (adhesion) and mechanical interaction between the two surfaces. In polymer-to-metal contacts, there is a natural propensity for polymer materials to be adhered to metallic counterfaces, which can be the fundamental basis for transfer film formation. There are different mechanisms for adhesion, including Coulomb electrostatic forces, van der Waals forces, and bonding from chemical reactions. In the case of PTFE-based coatings, as the coating is being rubbed against the pin surface, the adhesive junctions are thought to develop due to cohesive bonding between the PTFE-end caps or other free radicals, and the metallic surface (Bahadur, 2000). At the same time, the mechanical transfer of soft coating 119PDF Image | TRIBOLOGY OF POLYMERIC COATINGS FOR AGGRESSIVE BEARING APPLICATIONS
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