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The wear track profiles of the two PTFE-based coatings after the durability 3 hour tests are shown in Figure 3.13(c,d) and compared with the 30 min test results, which are repeated in Figure 3.13(a,b). Both coatings exhibited only mild burnishing with less than 5 μm of wear depth after 30 min test. After the 3 hour tests, more material removal occurred with the PTFE/MoS2 coating surface showing over 20 μm of wear depth, whereas, in the case of PTFE/Pyrrolidone-2 coating, surprisingly, still only 5 μm depth of material removal was observed. As discussed earlier, after 30 min testing, PTFE/MoS2 coating seemed to perform the best under unidirectional sliding conditions. However, as shown after the 3 hour tests, PTFE/Pyrrolidone-2 coating had superior wear performance to the other coatings, relevant to compressor applications. 3.4 Conclusion Different polymeric coatings based on PTFE, PEEK, fluorocarbon and resin were tested using a specialized tribometer under aggressive conditions simulating critical tribopairs of both piston-type (reciprocating motion) and swash plate (unidirectional motion) air-conditioning and refrigeration compressors. The following conclusions could be drawn: (a) Higher friction coefficient values in the range of 0.1 ~ 0.2 and wear rate values of -5 3 10 mm /N·m were measured under oscillatory conditions. Better performance with -7 3 lower friction coefficient values of 0.04 ~ 0.1 and wear rates of 10 mm /N·m were measured under unidirectional conditions. Under both operating conditions (but more so for unidirectional), polymeric coatings exhibited acceptable to superior tribological 46PDF Image | TRIBOLOGY OF POLYMERIC COATINGS FOR AGGRESSIVE BEARING APPLICATIONS
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