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influences the results at lower contact depths. The tested polymeric coatings in this work also showed very small range of plateau regions corresponding to actual coating’s properties as seen in Figure 4.8. Therefore, the best choice for obtaining the coating properties (that are both surface roughness- and substrate-independent) is at the critical contact depth where the substrate effect starts because the surface uncertainties mainly caused by surface roughness effect decrease with increasing contact depth. Knowing the critical contact depth (which is found to be 8-11 % for the polymeric coatings deposited on a hard substrate system), then the exact coating thickness can also be obtained without the need to measure it via cross section SEM. However, to precisely estimate the coating thickness, the critical contact depth and the precise geometry of the probe tip are needed to calculate the exact size of the plastic zone (Mata et al., 2006). 4.3.2 Mechanical properties In this section, the full-unloading method (multiple single-loadings) was used to perform indentation measurements on seven different coating samples to compare their micromechanical properties. Moreover, these readily obtained micromechanical properties were correlated with the coating’s structural properties and tribological performance. For each coating, a trapezoidal loading profile at a constant loading/unloading rate of ±10mN/s was used for nine to eleven varying maximum loads between 5 mN to 400 mN. For each maximum load, six indentations were repeated on different areas that were 150 μm apart from each other, as seen in Figure 4.9. The group of these six indentations was at least 2 mm apart from the other group of six indentations performed under a different maximum load. As can be seen in Figure 4.9, the condition 65PDF Image | TRIBOLOGY OF POLYMERIC COATINGS FOR AGGRESSIVE BEARING APPLICATIONS
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