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When a coating has uniform mechanical properties over the whole surface area as PTFE/Pyrrolidone-2, it exhibits very consistent load-bearing properties through the whole coating surface as the sliding tests proceed, thus resulting in stable friction behavior. Also, due to its uniform (amorphous) microstructure through the thickness, it can maintain its consistent frictional performance in spite of removal of coating material (wear) with sliding; consequently assuring long-term reliability of PTFE/Pyrrolidone-2 coating (survived over 40 km sliding distance test in section 3.3.2.3). However, the significantly varying (inconsistent) mechanical properties of PEEK/PTFE coating (over its surface and also through its thickness) resulted in inconsistent load-bearing properties as the pin is sliding over the coating surface, thus exhibiting fluctuations in friction coefficient and consequently higher wear. Therefore, it can be thought that the repeatability of the load-displacement curves during the indentation measurements (Figure 4.10(a) and 4.10(b)) could be directly related to their tribological performance. Similarly, this correlation can also be seen from the mechanical property plots in Figure 4.14. What appears to be more important than the averaged property values in Figure 4.14 is the relative length of the error bars for each coating (variability). The length of error bars of each coating caused by inconsistent mechanical properties is directly related to their frictional behavior under sliding tests. The most stable friction coefficient of PTFE/Pyrrolidone-2 coating corresponded to the shortest error bars in the mechanical properties in Figure 4.14, and the second most stable friction coefficient of PTFE/MoS2 also agreed with its mechanical property results. The most fluctuating friction coefficient with PEEK/PTFE coating showed the largest error bars in their mechanical property plots. As already discussed above, this is because coatings with 74PDF Image | TRIBOLOGY OF POLYMERIC COATINGS FOR AGGRESSIVE BEARING APPLICATIONS
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