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(PTFE/MoS2 and Resin/PTFE/MoS2) exhibited higher wear resistance, as MoS2 offers favorable surface properties due to its lamellar structure (which can sustain high normal loads and at the same time low shear strength between its planes, resulting in a lubricious low friction surface (Holmberg and Matthews, 2009)). The PEEK coating blended with ceramics exhibited the highest friction coefficient and wear rate among the seven coatings tested under dry-oscillatory conditions. Even though PEEK is usually known to be harder than PTFE, and thus expected to have better wear performance, this is not the case in our experiments, where polymeric coatings were tested (versus bulk). This performance variation of PTFE and PEEK polymers, depending on their form, either bulk or coating, is further discussed in conjunction to unidirectional testing results. 3.3.2 Unidirectional testing simulating swash plate compressors 3.3.2.1 Detailed experiments results The aforementioned seven polymeric coatings are now evaluated using dry- unidirectional testing to better understand their behavior under simulated swash plate compressor conditions. Figure 3.7(a) and (b) show the in-situ measurements of the friction coefficient and near contact temperature, respectively. Lower friction coefficient values in the range of 0.04 ~ 0.1 were observed under unidirectional conditions, while their near contact temperature was 3 to 4 times higher compared to the oscillatory experiments (likely due to an order of magnitude higher sliding speed). The near contact temperature behavior for all the coatings was similar in that at the start of the tests, it was around 22 °C and reached 100 °C immediately after test initiation. After that, depending on the coating, it either remained steady under 150 °C or reached values up to 250 °C. 34PDF Image | TRIBOLOGY OF POLYMERIC COATINGS FOR AGGRESSIVE BEARING APPLICATIONS
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