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CHAPTER 6: FRETTING EXPERIMENTS AND TRANSFER FILM EFFECTS OF POLYMERIC COATINGS 6.1 Introduction The sliding contact of polymers in the form of coatings against metallic counterfaces is becoming increasingly common in industrial applications due to improved coating processes on light weight substrates as well as favorable tribological behavior of polymeric coatings under moderate to severe contact conditions. A type of motion encountered in industrial bearing contact applications is reciprocating motion with extremely small amplitude of few mm to sub-mm, which is usually referred to as fretting motion or dithering motion. Of particular interest in this work is the tribological performance of polymeric coating contact surfaces in air-conditioning and refrigeration compressors experiencing such motion, e.g., in a scroll compressor. The tribological behavior of advanced blended bulk polymers has been extensively studied, and their superior tribological performance is usually attributed to their unique property of effective transfer film formation on the counterface during dry sliding (Burris et al., 2008, Wang and Yan, 2006, Wang and Yan, 2007, Lu and Friedrich, 1995, Bahadur and Schwartz, 2008, Bahadur and Sunkara, 2005, and Bahadur, 2000). Specifically, Burris et al. (2008) and Wang and Yan (2006) showed that the retention of protective transfer films strongly adhered to the counterface is primarily responsible for the improvements in wear resistance. Studies about the effects of fillers on the tribological behavior of polymer composites also show that improved wear performance is related to how well the fillers improved the ability of composites to form transfer films (Wang and Yan, 2006, Bahadur, 2000, and Friedrich et al., 2005). The mechanism of 103PDF Image | TRIBOLOGY OF POLYMERIC COATINGS FOR AGGRESSIVE BEARING APPLICATIONS
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