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studied to extract the pure polymeric coating’s properties decoupled from the substrate effect. Also, the root causes of tribological performance difference among various coatings were investigated from this material property characterization. Not only mechanical properties such as reduced modulus and hardness, but the micro-structural properties of polymeric coatings could be also explained from their load-displacement behavior during indenting. Additionally, the polymeric coatings were tested under more aggressive contact conditions such as elevated temperature to investigate the effect of increasing temperature on the tribological behavior of polymeric coatings, as well as to examine the performance limit of PTFE- and PEEK-based polymeric coatings. It was observed that the behavior of polymeric coatings greatly depended on the near contact temperature which eventually determined the visco-elastic property of polymers. Therefore, the visco-elastic property, especially recovery of polymeric coatings was further investigated using instrumented scratch test to directly correlate the recovery property and the frictional behavior of polymeric surfaces. Finally the tribological performance of two representative PTFE- and PEEK- based polymeric coatings was further evaluated under special conditions, namely, aggressive small amplitude reciprocating (fretting) pin-on-disk conditions. Such a condition is encountered by modern machinery, including air-conditioning and refrigeration compressors, and is sometimes also referred as “dithering” motion. Unlubricated step load-to-failure experiments to determine their scuffing resistance, as well as the effect of liquid lubricant on their friction and wear behavior have been 129PDF Image | TRIBOLOGY OF POLYMERIC COATINGS FOR AGGRESSIVE BEARING APPLICATIONS
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