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2.2 Applications and performance determining factors 2.2.1 Applications of polymer surfaces Due to their unique properties such as self-lubricity, resistance to impact, corrosion, chemicals, solvents, nuclear radiation, contamination with oils, etc., apart from easy processibility in complex shapes and capacity to absorb vibrations leading to quiet operation, tribological applications of polymers include gears, a range of bearings, bearing cages, and also conventional macro-scale automotive and marine applications. With recent technological advances in composite materials and coating process, the application of polymeric coatings has expanded to include biomedical, food processing and sports devices such as tennis racquets. Especially, these polymer-based tribo- components can be used in extreme conditions of temperatures (up to 300 ◦C) and pressures (vacuum to high), where liquid lubricants cannot be considered. Such tribo- components fabricated from the polymer composites are used in typical situations where either hydrodynamic lubrication is not possible because of frequent starts and stops or low PV (pressure–velocity) conditions. Therefore, polymeric bearing surfaces are the unique solution in the following situations where (Bijwe et al., 2009), • lubrication is a problem (tribological components in inaccessible equipment; for example, in nuclear reactors and in hazardous conditions in chemical plants or in vacuum or space); • conventional lubricants cannot be employed (in space or cryogenic temperatures where liquid lubricants will either freeze or evaporate); 12PDF Image | TRIBOLOGY OF POLYMERIC COATINGS FOR AGGRESSIVE BEARING APPLICATIONS
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