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composite coatings, and found that the behavior was determined by the interfacial contact temperature of the sliding parts, which was induced by the coupling effect of both sliding velocity and normal load. Therefore, the decrease in shear strength of the coating caused by increasing contact temperature could explain the reduction of friction coefficient with increasing sliding velocity. Also, they showed that the frictional behavior of polymer surfaces was significantly changed especially in the vicinity of its glass transition temperature (Tg). Chang et al. (2007) and Zhang et al. (2008) measured the frictional force changes of polymer composites with increasing temperature. They showed that the frictional force was determined by the product of adhesion (depending on the real contact area) on the interfacial zone and the shearing strength of the subsurface zone of the polymers (both of which were determined by the interfacial contact temperature between the two sliding surfaces). Hanchi and Eiss (1997) discussed the frictional behavior of PEEK- based composite surfaces in terms of the impact of temperature on the worn surface morphology and recovery property. Specifically, they characterized the recovery property of polymer surfaces at elevated temperatures, and showed that surfaces with higher recovery exhibited lower friction coefficient. Therefore, in this work, the elastic recovery property of polymeric coatings is further investigated quantitatively using an instrumented scratch test. Scratch testing is commonly used to examine not only the mechanical properties and damage mechanism of thin films, but also the elastic-plastic properties of polymer surfaces (Lin et al., 2000). Using a ‘3-step measurement method’ (pre-scan, actual in-situ scratch and post-scan) (Lin et al., 2000), elastic, plastic, and thus recovery rate of polymer surfaces can be quantitatively measured. 78PDF Image | TRIBOLOGY OF POLYMERIC COATINGS FOR AGGRESSIVE BEARING APPLICATIONS
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