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(Cannaday and Polycarpou, 2005) and hard coatings (Solzak and Polycarpou, 2006), in the presence of different refrigerants, sliding velocities and temperatures typical to compressor surfaces. Sheiretov et al. (1995) conducted a tribological study of polymer materials (polyimide and poly(amide-imide) polymers) for ACR compressor-specific applications for the first time. Then, Cannaday and Polycarpou (2005) characterized the tribological performance of bulk form of unfilled and filled polymers based on polytetrafluoroethylene (PTFE) and polyetheretherketone (PEEK) for compressor applications. Even though these bulk polymers showed promising tribological performance, their cost issues and especially thermal instability under high temperature were still significant barriers for actual industrial applications. Recently, therefore, tribologically advanced coatings are getting attention for new type of surface treatments of sliding/bearing contact parts of compressors. A further advantage of polymeric coatings on engineering surfaces is that their cost low, compared to advanced hard coatings. Coatings can be broadly classified as either “hard” or “soft” coatings, with one category of soft coatings being polymer-based coatings. Conventionally, hard coatings such as diamond-like carbon (DLC), Ti-N and WC/C synthesized through physical vapor deposition (PVD) techniques are thought to be effective in preventing both abrasive and adhesive wear of metal sliding contacts (Bloyce, 2000). DLC is one of the most researched tribological coatings, and is found in commercial applications such as magnetic storage hard disk drives (Suh and Polycarpou, 2006) and in automotive applications. These coatings are in the form of a hard film on the surface that are able to 4PDF Image | TRIBOLOGY OF POLYMERIC COATINGS FOR AGGRESSIVE BEARING APPLICATIONS
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