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performed. The morphology of the transfer films on the counterface was observed using SEM and profilometer measurements. 7.2 Main Conclusions Several conclusions could be made based on the tribological characterization of PTFE- and PEEK-based polymeric coatings performed in this work. These are itemized below: (1) Unidirectional sliding test of polymeric coatings exhibited acceptable to superior tribological performance with friction coefficient values of 0.04 ~ 0.1 and wear rates -7 3 of 10 mm /N·m under aggressive oil-less compressor conditions. Therefore, polymeric coatings are likely viable candidates for the next generation of oil-less compressors. (2) PTFE-based coatings (PTFE/Pyrrolidone and PTFE/MoS2) generally performed better than PEEK-based coatings (PEEK/PTFE and PEEK/Ceramic) under both piston-type (oscillatory motion) and swash plate (unidirectional motion) compressor conditions, which was not the case for bulk polymer blends (where typically PEEK composites filled with PTFE performed best). (3) Durability or time-to-failure (3-hour duration) unidirectional testing corresponding to 40.5 km sliding distance showed superb friction and wear behavior of PTFE-based coatings, especially PTFE/Pyrrolidone-2, thus demonstrating its potential applicability for use in oil-less compressors. 130PDF Image | TRIBOLOGY OF POLYMERIC COATINGS FOR AGGRESSIVE BEARING APPLICATIONS
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