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For the swash plate compressor simulation, the unidirectional sliding tests were performed with a rotating speed of 1500 rpm and an average wear track diameter of 43.2 mm which corresponded to a linear speed of 3.75 m/s. Environmental conditions were the same as oscillatory testing (i.e., 445 N normal load, room temperature without any feedback control, 172 kPa of CO2 refrigerant with no lubricant, and 30 min duration, corresponding to 6.75 km sliding distance). As the shoe is crowned the exact contact pressure is difficult to calculate and thus the contact load is used instead of the contact pressure. Similarly, two tests were performed for each condition, showing repeatable behavior. For the group of coatings which exhibited better tribological performance, additional unidirectional 3-hour long duration (durability) tests were performed to examine their long-term behavior, simulating compressor life tests (the 3 hour duration tests corresponded to 40.5 km sliding distance). Table 3.2 summarizes the experimental conditions for both oscillatory and unidirectional testing conditions. Table 3.2 Summary of experimental conditions. Oscillatory Unidirectional Temperature (°C) Environment (Refrigerant) Normal load (N) Contact geometry Contact pressure (MPa) Sliding speed (m/s) Test duration 21 ~ 23 25 psi of R744 (CO2) 445 Line contact 450 0.22 30 min Crowned contact - 3.75 30 min, 3 hours Using a stylus profilometer (Tencor P-15TM), four different line scans were taken across the wear tracks generated on the disk surfaces after testing, and an average value 29PDF Image | TRIBOLOGY OF POLYMERIC COATINGS FOR AGGRESSIVE BEARING APPLICATIONS
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