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with red color (that includes both elastic and plastic deformation) as well as the post scan with green color that shows the permanent (or plastic) deformation only (the difference being the elastic recovery). In the case of PEEK/PTFE, most deformation was plastic as seen in Figure 5.9(d). Also, compared to the smooth scratch curves of PTFE/Pyrrolidone-2, Figure 5.9(c), PEEK/PTFE showed significant fluctuations. This can be attributed to both its rougher surface, and also to its non-uniform (semi- crystalline) structure which was also examined in Chapter 4. Along with the scratch curves, the in-situ friction coefficient corresponding to the scratch curve (red) was also measured as seen in Figure 5.9(e) and 5.9(f). Relatively stable COF was observed for PTFE/Pyrrolidone-2 coating, while PEEK/PTFE coating showed some fluctuation due to its rough surface as well as its semi-crystalline microstructure. Figure 5.10(a,c,e) and Figure 5.10(b,d,f) show the microscratch results obtained with ramp loading up to 20 mN for 1% ATSP/PTFE and 5% ATSP/MoS2 coatings, respectively. Compared to PTFE- and PEEK-based coatings, these coatings showed relatively smoother scratch curves and thus stable friction coefficient during the scratch. Also, it was observed that most of deformation was elastic for ATSP-based coatings showing significant amount of recovery of deformed surfaces. 95PDF Image | TRIBOLOGY OF POLYMERIC COATINGS FOR AGGRESSIVE BEARING APPLICATIONS
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