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(4) (5) Procedures were established for high-load instrumented indentation on polymeric coatings, considering loading profiles (trapezoidal and single loading) and loading rates (10 mN/s) as well as their effect on the measured micromechanical properties. Using high-load indentations over the thickness of the coating, it was found that at lower contact depths (indenting 1-2 percent of the coating thickness) inconsistent elastic modulus and hardness values were measured due to surface “skin” effects. After that, there was a small plateau region up to a critical contact depth, which was found to be about 10 % of the coating thickness, where substrate effects become evident. This plateau region gives the “true” mechanical properties of the coatings. PTFE coating exhibited very repeatable load-displacement behavior and extracted micromechanical properties, indicating a uniform and amorphous microstructure, while PEEK coating’s load-displacement behavior was quite variable and unpredictable, which was attributed to its semi-crystalline porous microstructure demonstrated from SEM measurements. Tribological performance of polymeric coatings is not as much directly related to their micromechanical properties, but rather to the coating’s structural uniformity, as evident form the instrumented load/unload curves and manifested in their consistent (in the case of PTFE coatings) versus variable (in the case of PEEK coatings) micromechanical properties. From the frictional behavior of PTFE/Pyrrolidone-2 coating with elevated temperatures, it was observed that COF of amorphous structured polymer surface increased with increasing near contact temperatures (NCT), showing the maximum COF value at its NCT in the vicinity of its glass transition temperature. This is (6) (7) (8) 131PDF Image | TRIBOLOGY OF POLYMERIC COATINGS FOR AGGRESSIVE BEARING APPLICATIONS
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