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CHAPTER 3: TRIBOLOGICAL TESTING OF PTFE- AND PEEK- BASED POLYMERIC COATINGS FOR COMPRESSOR APPLICA TIONS 3.1 Introduction Compared to the abundance of research on the tribology of bulk polymers as discussed in Chapter 2, there is little work on the tribological behavior of polymeric- based coatings (with thicknesses in the 10’s of micrometers). The tribological behavior of polymeric coatings may not necessarily follow the same behavior as that of their bulk counterparts. This is partly due to the fact that the structure of the polymer materials changes during the coating process, which is known to affect the tribological performance, e.g., being amorphous or crystalline (Zhang et al., 2007). Research examining the tribological behavior of polymeric coatings (Zhang et al., 2006 and McCook et al., 2005), under mild conditions of 1 ~ 10 N normal load and 0.25 ~ 2.5 m/s sliding speed have been reported. Tribological testing of commercially available PTFE- and PEEK-based polymeric coatings under realistic compressor operating conditions (4.5 m/s sliding speed and normal loads of 400 N ~ 2,000 N) has also been reported. Demas and Polycarpou (2008) evaluated the tribological performance of two different PTFE/Pyrrolidone coatings and a Resin/PTFE/MoS2 coating under unlubricated and carbon dioxide (CO2) refrigerant environments with reciprocating motion, simulating the wrist pin in a piston-type compressor. The PTFE-based coatings showed excellent frictional characteristics, with friction coefficient values as low as 0.1, and good wear resistance attributed to the beneficial effects of the generated wear debris at the interface. Escobar Nunez et al. (2011) performed a comparative testing of PEEK-based coatings 22PDF Image | TRIBOLOGY OF POLYMERIC COATINGS FOR AGGRESSIVE BEARING APPLICATIONS
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