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Problems of Conventional Compressors using Oils - Not sufficient liquid film at all parts of compressor - Adverse effect of lubricant on refrigeration cycle - Adverse environmental effects of both lubricants and refrigerants - Emergence of ‘CO2 Compressors’: CO2 (R744)’s immiscibility with lubricant, and CO2 significantly affect the properties of the lubricant Oil-less Compressors - Excessive wear & premature failure of conventional tribo-pair materials (ex. Al390-T6 vs. 52100 steel) without surface treatments 1. BULK Polymers for interacting components (Cannaday and Polycarpou, 2005) - PTFE- and PEEK-blends materials, Low COF but high wear rate - Cost and long term reliability of polymers (creep, thermal instability) 2. Hard Coatings (Solzak and Polycarpou, 2008) - WC/C, WC/C + DLC, Relatively low COF and strong wear resistance - Expensive and difficulties in coating certain substrate 3. Soft (polymeric) Coatings - PTFE- and PEEK-based polymeric coatings - COF as low as 0.04 with relatively low wear rate ( ~ 10-7mm3/N·m) Figure 1.1 Motivation and development of advanced coating materials for oil-less compressor applications. Lastly, due to thermodynamically negative effects of lubricants on the refrigeration cycle of typical refrigeration and air conditioning compressors (Solzak and Polycarpou, 2006), recent research interest has focused on oil-less type compressors. Under these oil less and new refrigerant conditions, some form of surface treatments become necessary on the interacting surfaces for reliable operation of compressors. As described in Figure 1.1, extensive tribological studies have been performed by Prof. Polycarpou’s group using different method of surface treatments, namely bulk polymers 3PDF Image | TRIBOLOGY OF POLYMERIC COATINGS FOR AGGRESSIVE BEARING APPLICATIONS
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