Tribological Performance of Polymer-Based Coatings for Oil-Less Piston-Type Compressor Applications
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Due to thermodynamically adverse effects of liquid-type lubricants on the operation of air conditioning and refrigeration compressors, oil-less compressors are of current research interest. Under such conditions, advanced tribologically coatings are needed for critical interacting surfaces to ensure reliable operation under oil-less conditions. In this paper, seven commercially available polymeric coatings (PTFE-, PEEK-, resin- and fluorocarbon-based coatings) coated on gray cast iron were tribologically evaluated through unlubricated oscillatory experiments simulating a realistic wrist pin interface in a piston-type compressor. The experiments were performed in the presence of the environmentally friendly (as far as minimal global warming potential is concerned) carbon dioxide refrigerant, simulating oil-less piston-type compressors. It was found that polymer-based coatings exhibited excellent tribological performance, and in general PTFE-based coatings performed better than PEEK-based coatings. Also, their friction and wear behavior is affected by additives, which polymeric coatings were blended with. Specifically, PTFE coatings blended with pyrrolidone showed relatively low friction coefficient, and coatings blended with MoS2 had higher wear resistance. Copyright © 2010 by ASME.
author list (cited authors)
Yeo, S. M., Nunez, E. E., & Polycarpou, A. A.