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CHAPTER 7: CONCLUSION AND FUTURE WORK 7.1 Summary of dissertation Nowadays significant research is conducted in addressing and examining the applicability of polymer materials for use in various industrial sliding/bearing contact surfaces including air-conditioning and refrigeration compressors. Especially, with the development of polymer composite technology, some forms of polymers often have an advantage over other materials such as metals and ceramics showing superior frictional and wear performances. In the past few years, however, majority of research effort was focused only on the bulk form of polymers although the polymer coatings might be more economical and realistic for the actual applications. Therefore, in this dissertation, advanced polymer-based coatings were tribologically characterized for use in aggressive sliding/bearing contact surface applications. First, several PTFE-, PEEK-, Fluorocarbon- and Resin-based polymer materials were selected and prepared (coated) on gray cast iron substrates (disks). Then, these coatings were comparatively tested using a specialized tribometer to simulate the actual compressor operating conditions including oscillatory motion (simulating piston-type compressors) and unidirectional motion (simulating swash plate compressor operation). It was examined if these polymeric coatings could be used such aggressive sliding/bearing conditions as ACR compressors, and also which coatings between PTFE- and PEEK-based performed better. Micromechanical properties of these polymeric coatings were examined using instrumented high-load indentation technique. Optimized indentation method was 128PDF Image | TRIBOLOGY OF POLYMERIC COATINGS FOR AGGRESSIVE BEARING APPLICATIONS
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