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with different polymeric coatings. The shoe is made out of 52100 steel, and is 9.6 mm in diameter with a 1 mm diameter hole drilled up to 2 mm below the contact surface (on the back side) to accept a miniature thermocouple and measure the in-situ near contact temperature (NCT) during testing. The RMS roughness and hardness of the shoe surface was measured and found to be 0.03 ~ 0.04 μm and 11 ~ 12.5 GPa, respectively. These values are significantly smoother and harder than the polymeric coated disk surfaces. Three different chamber temperatures, room (23°C), 75°C and 110°C were used, where a recirculating heat transfer fluid was used to achieve these temperatures in the tribochamber. Note that the measured NCT is typically higher than the set chamber temperature due to frictional heating. Table 5.1 summarizes the experimental conditions for unidirectional sliding tests. Before each test, the non-coated pin samples were ultrasonically cleaned in acetone for 10 min, rinsed with 2-propanol, and finally dried with a warm air blower. The polymeric coated disk samples were cleaned in 2-propanol and were not exposed to acetone. A specialized High-Pressure- Tribometer (HPT) enabling high temperature testing up to 120°C was used for the tribological testing in this work (detailed explanation of the HPT can be found in chapter 3 and the cited references). Table 5.1 Summary of experimental conditions Machine setting temperature (°C) Environment (refrigerant) Normal load (N) Contact geometry Nominal contact pressure (MPa) Sliding speed (m/s) Test duration (mins) Testing conditions 23, 75 and 110 R744 (CO2) at 25 psi 445 Complex, primarily nominally flat 30 3.75 30, 60 81PDF Image | TRIBOLOGY OF POLYMERIC COATINGS FOR AGGRESSIVE BEARING APPLICATIONS
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