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3.3.2.3 Durability unidirectional testing Since the 30 min tests (corresponding to 6.75 km sliding distance) might not be sufficiently long to validate the polymeric coating’s reliability in compressor applications, and to also further substantiate the superiority of the PTFE-based coatings, 3 hour long duration unidirectional tests (corresponding to 40.5 km sliding distance) were performed for PTFE/Pyrrolidone-2, PTFE/MoS2, and PEEK/PTFE coatings, and shown in Figure 3.12. 0.2 0.1 0.0 0 40 80 120 160 (a) PTFE/MoS2 PTFE/Pyrrolidone-2 PEEK/PTFE 300 200 100 Time (min) (b) PTFE/MoS2 PTFE/Pyrrolidone-2 PEEK/PTFE 0 0 40 80 120 160 Time (min) Figure 3.12 In-situ (a) friction coefficient and (b) near contact temperature of PTFE/MoS2, PTFE/Pyrrolidone-2, and PEEK/PTFE coatings during 3 hour unidirectional testing. Even though none of these coatings showed scuffing with the 30 min tests, PEEK/PTFE coating eventually scuffed after 105 min, with sharp increase of the friction coefficient as seen in Figure 3.12(a). Both PTFE-based coatings exhibited very stable 44 NCT .(C) COFPDF Image | TRIBOLOGY OF POLYMERIC COATINGS FOR AGGRESSIVE BEARING APPLICATIONS
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