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Additionally, liquid lubricated testing was performed under exactly the same testing conditions to investigate the interaction between lubricant and the polymeric coatings under fretting conditions (the need for such testing is that even though polymeric coatings are envisioned to replace liquid lubricants in the future, it is likely that there will be a transitional phase where the polymeric coatings will be used together with existing liquid lubricants). For the lubricated tests, a commercially available polyolester (POE)-based lubricant (RL32-3MAF) that was currently used in existing air-conditioning and refrigeration compressors was used. This lubricant has a viscosity of 31.2 cSt at 40 °C and 5.8 cSt at 100 °C, and its viscosity index (VI) is 125. Before each test, the non-coated pin samples were ultrasonically cleaned in acetone for 10 min, rinsed with 2-propanol, and dried with a warm air blower. The polymeric coated disk samples were cleaned in 2-propanol and were not exposed to acetone. Table 6.2 Summary of experimental conditions Temperature (°C) Environment (refrigerant) Reciprocating frequency (Hz) Reciprocating amplitude (mm) Average linear sliding speed (mm/s) Contact geometry Normal load (N) Nominal contact pressure (MPa) Test duration (min) Testing conditions 23 (room temperature) R-134A at 40 psi 4.4 3 26.4 Nominally flat surface contact 133 - 1334 4.28 – 42.8 (6.3mm pin), 16.58 – 165.8 (3.2 mm pin) 20 (up to failure) 108PDF Image | TRIBOLOGY OF POLYMERIC COATINGS FOR AGGRESSIVE BEARING APPLICATIONS
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