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because, with increasing NCT, polymer surface becomes more plastic resulting in more real contact area, and thus more adhesion on the interfacial zone. Then, as the NCT exceeds the Tg, the COF decreases due to the rapid decline of viscosity and shearing strength on the subsurface zone of polymer caused by the complete scission of molecular chains at temperature higher than Tg. Therefore, it can be summarized that the overall frictional behavior of polymer surface is determined by the viscoelastic property of polymers which directly depends on its near contact temperature. (9) In order to verify the fact that the polymer surfaces with higher recovery usually had lower COF, the elastic recovery of PTFE-, PEEK-, and ATSP-based polymeric coating surfaces was examined using the scratch testing. As expected, the PTFE/Pyrrolidone-2 coating surface exhibited three times higher elastic recovery (60 %) than PEEK/PTFE coating surface (20 %). Also, ATSP-based coating surface showed the highest recovery around 90 % with the lowest COF values observed directly from the in-situ COF measurements during the scratching process. (10) The tribological performance of the polymeric coatings under fretting conditions was greatly influenced by the ability of the polymers to form a transfer film on the metal pin counterface. The pin surface tested with PTFE/Pyrrolidone showed a continuous and stable transfer film, while in the case of PEEK/PTFE, only small amount of material was transferred to the counterface, thus exposing hard metal asperities on the contact interface. (11) Transfer film formation was initiated by interlocking of polymer wear debris within the counterface asperities, thus gradually smoothening and filling the rough pin 132PDF Image | TRIBOLOGY OF POLYMERIC COATINGS FOR AGGRESSIVE BEARING APPLICATIONS
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