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found to be about 10 % of the coating thickness, where substrate effects become evident. This plateau region gives the “true” micromechanical properties of the coatings. (c) One of the PTFE- and one of the PEEK-based coatings were further examined after nanoindentation using SEM, and it was found that the PTFE coating exhibited very repeatable load-displacement behavior and extracted micromechanical properties, indicating a uniform and amorphous microstructure. The PEEK coating’s load- displacement behavior was quite variable and unpredictable, which was attributed to its semi-crystalline porous microstructure. The consistent behavior of the PTFE coating was correlated with its superior tribological behavior. (d) The measured micromechanical properties of the various polymeric coatings tested showed that PEEK-based coatings exhibited higher elastic modulus than PTFE-based coatings, while their hardness values showed the opposite trend. Their tribological performance, however, is not as much directly related to their micromechanical properties, but rather to the coating 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. 76PDF Image | TRIBOLOGY OF POLYMERIC COATINGS FOR AGGRESSIVE BEARING APPLICATIONS
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