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in Figure 6.13(c), the roughness was slightly reduced to 288 nm Rq compared to the original pin surface, but it still showed a much rougher pin surface compared to the PTFE/Pyrrolidone case. Because the transfer film was not effectively formed, the pin surface showed clear asperities and valleys, as seen in Figure 6.13(d). In this case, the hard asperities are continuously wearing out the soft polymeric coating surface with repeated fretting cycles, resulting in higher wear rate and eventually scuffing. The ability of polymer materials to form a transfer film is known to be greatly dependent on their wear debris shape and size. Studies, e.g., Burris et al. (2008), Wang and Yan (2007) and Bahadur (2000) showed that smaller and fine wear debris were more favorable and helpful to fill the crevices of asperities on the counterface as shown in Figure 6.13. Transferred layers that are formed with larger and flake-like debris are more easily removed from the valleys of metal surfaces with continuous sliding, and need more rapid replenishment, thus resulting in higher wear rate of the polymer surface (Wang and Yan, 2006). The PTFE/Pyrrolidone coating showed very fine wear debris, while the wear debris of PEEK/PTFE coating were larger and flake-like as seen in Figure 6.6 and also in Figure 3.9. Therefore, transferred PTFE/Pyrrolidone is stable on the metal pin surface, and fewer debris are extruded from the contacting region, thus resulting in a smooth metal counterface, as seen in Figure 6.13(b). 6.3.2.4 Transfer films under liquid lubricated conditions Figure 6.14(a) shows a typical SEM image of the pin surface tested with PTFE/Pyrrolidone coating under liquid lubricated conditions as discussed in Figure 6.8. Compared to the pin surface tested with the same coating under dry conditions in Figure 124PDF Image | TRIBOLOGY OF POLYMERIC COATINGS FOR AGGRESSIVE BEARING APPLICATIONS
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