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Figure 5.3 (a) Scanning electron microscopy (SEM) image of conical tip used for scratch testing in this work, (b) zoomed in image showing the tip radius. 5.3 Results and discussion 5.3.1 Tribology of polymeric coatings at elevated temperatures 5.3.1.1 Elevated temperature tribological testing Figure 5.4(a) and 5.4(b) show the in-situ friction coefficient and NCT, respectively, with respect to the duration of the test under unidirectional sliding for three different polymeric coatings tested under room temperature conditions. As shown, all three coatings survived the duration of the 30 min tests, showing acceptable frictional behavior with average friction coefficient values (taken from 10-30 min) of 0.079 (and a standard deviation, std of 0.008) for PEEK/PTFE, 0.047 (std 0.007) for PTFE/Pyrrolidone-1, and 0.043 (std 0.003) for PTFE/Pyrrolidone-2. As already pointed out, even though the environmental (machine) temperature was set to 23°C, the NCT (which is close to the actual interfacial temperature) is significantly higher due to friction-induced heating. The NCT clearly differentiated PTFE- and PEEK-based coatings as seen in Figure 5.4(b). Both PTFE/Pyrrolidone-1 and PTFE/Pyrrolidone-2 coatings had similar NCT between 100°C and 150°C (gradually increased to a maximum 84PDF Image | TRIBOLOGY OF POLYMERIC COATINGS FOR AGGRESSIVE BEARING APPLICATIONS
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