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under starved lubricated (mixture of R-134A refrigerant and polyalkylene glycol lubricant) and unidirectional sliding conditions simulating swash plate compressors. A study of a newly developed Aromatic Thermosetting Copolyester applied as a coating, has showed exceptionally low wear performance and reasonable friction behavior, and is under further development (Zhang et al., 2010). A research question that still remains unanswered is which of the two families of coatings; PTFE-based or PEEK-based offer superior tribological performance under either piston-type (reciprocating) or swash plate (unidirectional) compressor conditions, as well as their comparison with their bulk counterparts. In this chapter, therefore, seven different PTFE- and PEEK-based coatings are tribologically evaluated under different operating conditions, simulating both unidirectional and oscillatory motions, and compared to bulk polymers. Additionally, newly developed ATSP-based coatings were also tested under identical conditions as commercial coatings, and discussed in detail in Appendix A. 3.2 Experimental Oscillatory and unidirectional testing conditions (simulating piston-type and swash plate compressors) were performed. Photographs of typical piston-type and swash plate compressors and their corresponding critical tribo-contacts are shown in Figure 3.1. To simulate the contact geometry in a wrist pin/ connecting rod interface of piston-type compressors, shown in Figure 3.1(a), the cylindrical pins were cut to length and oriented to create a line contact with a reciprocating disk coated with different polymeric coatings. The photograph and illustration in Figure 3.1(b) shows the contact configuration for 23PDF Image | TRIBOLOGY OF POLYMERIC COATINGS FOR AGGRESSIVE BEARING APPLICATIONS
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