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COF and NCT at around 23 min. Interestingly, this classification corresponded to the matrix the coating was made out of, in that PTFE-based coatings were the best performing group, PEEK-based coatings the second best group, and the others the worst performing group. It can be noticed from Figure 3.7(a) that the friction coefficient of PTFE-based coatings such as PTFE/Pyrrolidone-2 and PTFE/MoS2 is not only low, but their values are also stable with very small deviations during the whole test, compared to fluctuating friction coefficient of PEEK-based coatings. This fluctuation of the COF is related to friction-induced wear mode, which is seen in the wear track profiles, shown next. Figure 3.8 shows the wear track profiles of all seven polymeric coatings after 30 min testing under dry-unidirectional conditions. PEEK-based coatings that exhibited fluctuating friction coefficient also show material removal, due to friction-induced wear mode. On the other hand, PTFE-based coatings experienced only mild burnishing of less than 5 μm deep. Figure 3.8(a,b) and (c,d) show line scans of two different wear track locations for PTFE/Pyrrolidone-1 and PTFE/Pyrrolidone-2 coating, respectively. Both coatings exhibited similar mild wear behavior with an average wear depth of 2 ~ 4 μm, which was significantly lower compared to oscillatory testing results. The PTFE/MoS2 coating showed slightly higher wear resistance with less than 2 μm of wear as seen in Figure 3.8(e). PEEK/PTFE was worn out completely, Figure 3.8(f), and its wear profile was the same as the crown shape of the counter-surface shoe. Despite this high wear, the PEEK-based coating survived the total 30 min testing due to the beneficial effect of the generated wear debris. The two scuffed coatings showed over 60 μm of sharp and deep wear scars, which penetrated through the coating and wear the cast iron substrate as well. 36PDF Image | TRIBOLOGY OF POLYMERIC COATINGS FOR AGGRESSIVE BEARING APPLICATIONS
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