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is a semi-crystalline polymer, was compared to three amorphous polymers, PMMA, PC, and polystyrene (PS). These works showed that micromechanical properties of polymers were significantly affected by their microstructure. In measuring the mechanical properties of coatings on a substrate, there is a complexity in obtaining coating properties that are not affected by the substrate properties (or to what extend they are affected). Strojny et al. (1998) and Xia et al. (1998) measured the properties of thin (less than 5 μm thick) PMMA and polyurethane-based coatings under controlled laboratory conditions, and showed the significant effect of substrate and surface topography on the measured modulus values. Tayebi et al. (2004) examined the substrate effects on the hardness of two coating/substrate systems, representative of a soft coating on a hard substrate (Au/Fused Quartz) and a hard coating on a soft substrate (SiO2/Al), using both the nanoindentation and nanoscratch techniques. It was validated that at sufficiently shallow depths (which depend on the coating system as mentioned above and technique used), one can obtain “true coating” mechanical properties. Hay (2009) studied the substrate influence on the mechanical properties of three different kinds of dielectric films (5 GPa, 7 GPa, 15 GPa of modulus, respectively) on silicon wafers using instrumented indentation. It was observed that, at small contact depths, the error due to the substrate influence was small, but the uncertainty was greater due to “skin” effects such as surface roughness, tip variations, and stage vibrations. However, as indentation depth increased, the error due to substrate effects became dominant. In this chapter, we report on the micromechanical properties of seven different PTFE- and PEEK-based polymeric coatings, with particular emphasis placed on the cast 49PDF Image | TRIBOLOGY OF POLYMERIC COATINGS FOR AGGRESSIVE BEARING APPLICATIONS
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