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coated disk samples were cleaned in 2-propanol and dried, but were not exposed to acetone. For the oscillatory experiments simulating piston-type compressor operation (Figure 3.1(a)), a constant normal load of 445 N was applied on the stationary pin (corresponding to a nominal mean contact pressure of 450 MPa), representing aggressive compressor conditions. To enable run-in and avoid initial abrupt failures, the pin was gently brought into contact with the disk surface with a 44.5 N preload before test initiation. The coated disk was reciprocating at a frequency of 4.5 Hz with 60° amplitude (peak-to-peak) and an average wear track diameter of 47.6 mm producing an average linear velocity of 0.22 m/s. To examine the applicability of these coatings for use in oil- less compressors, tests were performed at 172 kPa (25 psi) R744 (CO2) refrigerant environment with no lubricant. Also, all tests were performed at room temperature (21~23°C) conditions without any temperature feedback control on the HPT, thus allowing natural increase of the temperature on both pin and disk samples (with continuous sliding during testing). Two tests were performed for each condition for repeatability, and each test was run for 30 min, corresponding to a sliding distance of 396 m. Tests were stopped earlier when the friction coefficient and near contact temperature abruptly increased, indicating destruction of the coating and sudden catastrophic failure of the interface. Under oscillatory testing conditions, four of the coatings (PEEK/PTFE, PEEK/Ceramic, Fluorocarbon, PTFE/MoS2) were tested in this work, as the other three coatings were tested under identical conditions in earlier work (Demas and Polycarpou, 2008) and were directly used in this work. For unidirectional testing, all seven coatings were tested. 28PDF Image | TRIBOLOGY OF POLYMERIC COATINGS FOR AGGRESSIVE BEARING APPLICATIONS
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