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The tribological performance of PTFE- and PEEK-based polymeric coatings was investigated under room temperature environmental conditions in Chapter 3. PTFE- based coatings showed exceptional friction behavior with acceptable wear resistance, and PEEK-based coatings exhibited promising tribological performance as a solid lubricant, thus necessitating further investigation of these coatings under aggressive higher temperature conditions. In this work, PTFE- and PEEK-based polymeric coatings were tribologically tested under elevated temperature conditions to examine their high temperature tribology along with their performance limits. Also, scratch measurements were performed on polymeric coating surfaces to measure their elastic recovery properties, and to correlate them with their frictional behaviors. 5.2 Experimental 5.2.1 Samples Three of the seven coatings listed in Table 4.1, namely, PTFE/Pyrrolidone-1 (DuPontTM Teflon® 958-303), PTFE/Pyrrolidone-2 (DuPontTM Teflon® 958-414), ® PEEK/PTFE (1704 PEEK/PTFE ) were used in this chapter. Additionally, two different Aromatic Thermosetting Polyesters (ATSP)-based coatings, 1 % ATSP/PTFE (where there is 1 % of PTFE in ATSP without any additional materials) and 5 % ATSP/MoS2 (i.e., 5 % MoS2 in ATSP), were prepared by ATSP Innovations LLC (ATSP Innovations). The same substrate material, gray cast iron, was used for these coatings as well, but these coating materials were differently deposited on the substrate using a solution cast method. For all polymeric coatings, their thickness values, measured over 200 μm areas were relatively uniform, and in the range of 25 μm to 35 μm, which is much thicker than 79PDF Image | TRIBOLOGY OF POLYMERIC COATINGS FOR AGGRESSIVE BEARING APPLICATIONS
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