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ABSTRACT To meet the higher performance requirements of today’s air-conditioning and refrigeration (ACR) compressors, their operating conditions have been getting harsher under higher speed and load, thus making tribological characteristics of interacting surfaces playing a significant role in compressor’s reliability. However, the capabilities of conventional fluid lubricants are limited such that the state of lubrication is usually unknown, and, at best, in the boundary/mixed lubrication regimes. Therefore, it becomes necessary to implement some type of advanced protective coatings on the interacting surfaces to withstand stringent contact conditions. Due to favorable tribological performance, polytetrafluoroethylene (PTFE)- and polyetheretherketone (PEEK)-based polymeric coatings have received interest in ACR compressor applications, as a potential solution to supplement and potentially replace conventional oil lubricants. However, compared to a great amount of research and experiments done so far for bulk of polymers, there is limited literature on the tribological performance of PTFE- and PEEK-based polymeric coatings. In this work, several PTFE-, PEEK-, resin- and fluorocarbon-based polymeric coatings, coated on gray cast iron were tribologically evaluated using a specialized tribometer under compressor specific conditions. The coatings showed good to excellent tribological performance, and in general PTFE-based coatings exhibited better friction and wear behavior than the rest of the coatings, including PEEK-based coatings. The micromechanical properties of polymeric coatings were examined using instrumented microindentation. The load-unload responses were used to measure the iiPDF Image | TRIBOLOGY OF POLYMERIC COATINGS FOR AGGRESSIVE BEARING APPLICATIONS
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