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that the surface with higher elastic recovery property had better frictional behavior than surfaces with highly plastic property such as PEEK/PTFE coating. 1.0 0.8 0.6 0.4 0.2 0.0 Figure 5.12 In-situ friction coefficient vs. normal loads of 4 different polymeric coating surfaces measured during actual scratch cycle. 5.4 Conclusion PTFE- and PEEK-based polymeric coatings were tribologically tested using a specialized tribometer under unidirectional sliding conditions with elevated temperatures simulating the aggressive ACR compressor operations. Also, these polymeric coating surfaces were subjected to scratch testing to investigate their viscoelastic (recovery) properties and to correlate them with their frictional behaviors from the tribometer testing, and the following conclusions could be drawn: (a) Among various PTFE- and PEEK-based coatings, PTFE/Pyrrolidone-2 was the only coating which survived the whole duration of 60 min testing under 75°C setting PTFE/Pyrrolidone-2 PEEK/PTFE 1% ATSP/PTFE 5% ATSP/MoS2 0 10 20 30 Normal Load (mN) 100 COFPDF Image | TRIBOLOGY OF POLYMERIC COATINGS FOR AGGRESSIVE BEARING APPLICATIONS
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