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increasing temperature, and also could potentially explain as to why PTFE/Pyrrolidone-2 exhibited better frictional behavior than PEEK/PTFE coatings. The clear difference of elastic recovery (plasticity) between PTFE/Pyrrolidone-2 and PEEK/PTFE coatings can be qualitatively seen from their worn surfaces examined by SEM, as seen in Figure 5.8. Figure 5.8(a) and 5.8(b) depict the worn surface of PEEK/PTFE coating tested at 23°C, showing “regular” material stacks perpendicular to the direction of sliding caused by adhesion-induced plastic deformation (stick-slip of shoe). Also, from Figure 5.8(b), it can be observed that the coating material is removed as a big chunk from the surface. Therefore, relatively high friction coefficient along with higher friction-induced heating of PEEK/PTFE coating is ascribable to these severe plastic deformation and material removal caused by its significantly plastic surface. In the case of PTFE/Pyrroildone-2, even though some plastic plowing was observed from the worn surface tested at 23°C (Figure 5.8(c) and 5.8(d)), it was not as severe as PEEK/PTFE coating due to PTFE/Pyrrolidone-2 coating’s relatively elastic surface, thus resulting in relatively low COF. In the next section, the elastic recovery property of these coatings is quantitatively examined using scratch tests and correlated with their frictional behavior. From the elevated temperature tribotesting, it was shown that the overall frictional behavior of polymer surfaces was determined by their viscoelastic properties, which also changes with their NCT. The more elastic is the polymer surface (with higher recovery) the lower is the COF because a plastic surface has a higher real contact area, thus resulting in higher adhesion and adhesion-induced plastic deformation/plowing leading to higher frictional force. 93PDF Image | TRIBOLOGY OF POLYMERIC COATINGS FOR AGGRESSIVE BEARING APPLICATIONS
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