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which can be attributed to the coating powder/particle size used. The thickness of the two coatings was measured using cross section SEM, and found to be 23 ± 5 μm and 40 ± 5 μm, respectively, for PTFE/ Pyrrolidone and PEEK/PTFE coatings. Table 6.1 Physical properties of the polymeric coatings used in this work. Color Thickness (μm) Rq (Std.) (μm) Elastic modulus (Std.) (GPa) Hardness (Std.) (MPa) PTFE/Pyrrolidone Dark green 23 ± 5 0.61 (0.08) 3.7 (0.1) 51 (3) PEEK/PTFE Dark gray 40 ± 5 1.00 (0.03) 4.5 (0.8) 42 (13) 6.2.2 Tribological testing conditions A high pressure tribometer (HPT) enabling the application of a precisely controlled (closed loop) normal load and the measurement of in-situ friction coefficient on the pin-on-disk (coated) contact interface was used for the fretting experiments. The pin is placed on the lower stationary holder which is directly mounted on a force transducer sensing both normal force and friction force, thus obtaining the friction coefficient. The coated disk is securely attached on the upper oscillating spindle, enabling fretting-type of motion at the interface. Further details of the HPT can be found in Escobar Nunez et al. (2011) and Demas and Polycarpou (2008). The pins were also made out of the same gray cast iron as the substrates, and machined as seen in Figure 6.2. In addition to the “standard” cylindrical pin having 6.3 mm diameter (of contact area), a reduced diameter (3.2 mm) pin was also used to achieve 106PDF Image | TRIBOLOGY OF POLYMERIC COATINGS FOR AGGRESSIVE BEARING APPLICATIONS
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