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correlation with their tribological performance (section 4.3.3). Figure 4.10(a) and 4.10(b) show the load-displacement curves of PTFE/Pyrrolidone-2 and PEEK/PTFE coatings, respectively. The elastic modulus and hardness values determined from these curves (six measurements for each maximum load instead of the two shown in the figure) are plotted in Figure 4.10(c) and 4.10(d), respectively. Clear differences on load-displacement curves between the two coatings could be observed; PTFE/Pyrrolidone-2 in Figure 4.10(a) exhibited repeatable load-displacement behavior, namely, the two curves at the same maximum load showed exactly the same path. Also, note that the loading curves in this case are almost identical, for all peak load experiments. Considering that each indentation was performed at a different area of the coating surface, this repeatability implies very uniform structure and mechanical properties over the whole coating surface area. At the same time, the smoothly increasing loading curve shows their structural uniformity through the coating thickness. These characteristics explain the small x- and y-axis error bars of the elastic modulus and hardness of PTFE/Pyrrodlidone-2 coating, as seen in Figure 4.10(c) and 4.10(d). Thus, PTFE/Pyrrolidone-2 coating can be thought to have amorphous-like microstructure. In the case of PEEK/PTFE coating, the load-displacement curves showed completely different paths for all indentations, and the slopes of the loading curves differ significantly. This implies that the mechanical properties of PEEK/PTFE coating differ from location-to-location on the surface, which can also be seen by the large error bars of elastic modulus and hardness of PEEK/PTFE coating in Figure 4.10(c) and 4.10(d). Also, examining the loading curve, its slope is not smoothly increasing, but changing at some penetration depth, which means its microstructure is not uniform through the coating 67PDF Image | TRIBOLOGY OF POLYMERIC COATINGS FOR AGGRESSIVE BEARING APPLICATIONS
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