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agreement with earlier studies of polymer materials at elevated temperatures (Hanchi and Eiss, 1997, Zhang et al., 2008, and Lu and Friedrich, 1995). 0.15 (a) 0.10 0.05 o 23 C o 75 C o 110 C o NCT ( C) COF 0.00 0 20 40 60 (b) 200 150 100 0 20 40 60 Time (min) Figure 5.6 In-situ (a) friction coefficient and (b) NCT of PTFE/Pyrrolidone-2 coating during 60 min dry unidirectional sliding test under three different temperatures. 5.3.1.2 Friction mechanism of polymer surfaces at elevated temperatures To better understand this behavior, we need to understand how the frictional force is determined for sliding wear of a polymer surface against a metallic counterpart. The surface layer of the polymer involved in the frictional process can be classified into two zones: the interfacial zone with a depth of about 100 nm and the subsurface zone 88PDF Image | TRIBOLOGY OF POLYMERIC COATINGS FOR AGGRESSIVE BEARING APPLICATIONS
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