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-4 3 but the wear rate was estimated to be 1.23 × 10 mm /N·m, which was over 150 times higher than for ATSP/Fluoroadditive coatings. Coating processes and blend compositions are being developed and optimized to find out the best performing coatings, and some preliminary tribo-testing of these new coatings was performed to examine their frictional and wear behaviors under aggressive sliding/bearing contact conditions. Therefore, in this section, 5% (wt%) ATSP/PTFE coating solution-casted on the cast iron substrate was tested under aggressive and realistic compressor specific conditions, namely the conditions under which PTFE- and PEEK- based coating were already tested in Chapter 3, which enables the direct comparison of tribological performance between ATSP- and PTFE/PEEK-based coatings. A.2 Results and discussion A.2.1 Dry-unidirectional testing under room temperature For the swash plate compressor simulation, the unidirectional sliding tests were performed with a rotating speed of 1500 rpm and an average wear track diameter of 43.2 mm which corresponded to a linear speed of 3.75 m/s. Environmental conditions include 445 N normal load, room temperature without any feedback control, 172 kPa (25 psi) of CO2 refrigerant with no lubricant, and 30 min duration, corresponding to 6.75 km sliding distance. The crowned 52100 steel shoes with 9.6 mm diameter were used as a counter part. More details about the experimental setup can be found in Section 3.2 and Table 3.2 as well. Figure A.1(a) and (b) show the in-situ measurements of the friction coefficient and near contact temperature, respectively, of 5% ATSP/PTFE coating during 30 min 142PDF Image | TRIBOLOGY OF POLYMERIC COATINGS FOR AGGRESSIVE BEARING APPLICATIONS
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