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surface with transferred polymer material. Most of the wear of the polymer film occurred during this initial process of transfer film formation. Once a stable transfer film was formed on the counterface, it acted as a lubricating layer on the interface by protecting the soft polymers from further damage by hard and sharp metal asperities on the counterface. (12) The addition of liquid lubricant on the contact interface in the presence of the polymeric films was not tribologically beneficial all the time. Specifically under such more complex interface conditions, higher wear rate was measured compared to the unlubricated case. This is likely due to the fact that the liquid lubricant was washing away the polymer wear debris thus not allowing it to form a beneficial transfer film on the metal counter surface. 7.3 Recommendations and Future Work From the work reported in this dissertation, author has realized that one of the most significant factors affecting the tribological behavior of polymeric coatings might be the microstructure and consequently the wear debris of polymers. Even though Chapter 4 already investigated the microstructure of two representative PTFE- and PEEK-based coatings using indentation and SEM measurements, still there are unanswered questions about more precise and quantitative structural properties of polymeric coatings. Therefore, more preferred and common method to characterize the structure of materials such as transmission electron microscopy (TEM) and X-ray diffraction (XRD) should be used for the polymeric coatings studied in this work. The clear understanding of polymer structure will also explain the formation of wear debris of 133PDF Image | TRIBOLOGY OF POLYMERIC COATINGS FOR AGGRESSIVE BEARING APPLICATIONS
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