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Cannaday and Polycarpou (2005), for example, demonstrated that bulk form of PEEK blended with graphite exhibited the lowest friction coefficient and wear rate compared to PTFE blended with graphite in both R-134A and ambient air environments (under unidirectional sliding conditions). Also, it was shown in Ref. Burris and Sawyer (2007) that bulk form of PEEK blended with PTFE exhibited lower wear rate than any other PTFE blends, such as PTFE/PEEK, PTFE/CNT and PTFE/Si3N4. These performance variations of PTFE and PEEK polymers depending on their form, either bulk or coating, could be attributed to the different wear mechanism for each case. For bulk materials, continuous scratching and peeling of polymers are the dominant wearing mechanism, and thus making harder materials tend to exhibit lower wear rate. This is why the harder PEEK blends usually perform better than PTFE blends when they are used in bulk form. In the case of coatings, wear debris comes to effectively serve as solid lubricant at some point due to usually very hard substrate material (cast iron in this work) which is not the case in bulk polymers where continuous material removal occurs. Therefore, the filling effect of the wear debris explained in Figure 3.8 becomes dominant in the wear behavior of polymeric coatings. In this case, the structure of the coating plays a key role in determining the formation of wear debris and the overall behavior of the coating. Originally, both PTFE and PEEK polymers are classified as crystalline thermoplastic along with the most widely used low density polyethylene (LDPE) (Brinson and Brinson, 2008). However, the sputtered PTFE films usually have an amorphous structure, resulting in very fine wear debris (Holmberg and Matthews, 2009) which is more favorable for effective lubrication. Obtaining an amorphous PEEK is almost impossible due to its high crystallizing speed and low thermal conductivity (Zhang et al., 2007). 42PDF Image | TRIBOLOGY OF POLYMERIC COATINGS FOR AGGRESSIVE BEARING APPLICATIONS
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