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TRIBOLOGY OF POLYMERIC COATINGS FOR AGGRESSIVE BEARING APPLICATIONS

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TRIBOLOGY OF POLYMERIC COATINGS FOR AGGRESSIVE BEARING APPLICATIONS ( tribology-polymeric-coatings-for-aggressive-bearing-applicat )

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polymer surface, and their size and shape as well, which was known to greatly affect the tribological behavior of polymeric coatings. It should be also noted that the structure of polymeric coatings can be significantly affected by the coating process, thus necessitating further investigation of detailed coating process and their effect on the eventual tribological performance of polymeric coatings. It was shown in Chapter 5 that another important factor determining the tribological behavior of polymeric coatings was the temperature, more specifically near contact temperature (NCT) of polymer interface. Therefore, further study should be focused on the material property characterization under elevated temperature conditions compared to room temperature measurements in this work. Various material properties such as modulus, hardness, scuffing resistance and recovery under varying temperature will give us insight of different tribological behavior of different polymer materials. Lastly, these polymeric coating can be combined with advanced surface technology such as surface texturing to result in superior lubricity on the contact interface. During the last dozen years the use of surface texturing has been shown to reduce friction and prolonged component life, under primarily lubricated conditions (Etsion, 2004 and Etsion, 2005). Also, initial study of this laser-texturing technique by Mishra and Polycarpou (2011) already showed their significant effect on the tribological performance improvement of compressor-specific surfaces under starved lubrication conditions. Therefore, now, further tribological investigation of textured surface not only with oils but also with polymeric coatings will be needed to better understand their interaction with solid lubricants, consequently resulting in promising tribological performance for compressor use. 134

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