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CHAPTER 2: FUNDAMENTALS OF POLYMER TRIBOLOGY 2.1 Introduction Polymers play an important part in materials and mechanical engineering, not just for their ease in manufacturing and low unit cost, but also for their potentially excellent tribological performance in engineered forms. Recently, with improvement of coating processing technology, polymeric-based coatings are increasingly used not only for aesthetic reasons, but more importantly for improving component functional performance, such as improving lubricity, corrosion, and wear, which will be studied in detail in this work. Polymers have various tribological advantages such as, 1) relatively low friction coefficient (0.1 to 0.3 during unlubricated sliding against either themselves or metals), 2) dispensable periodic maintenance (self-lubricating properties), 3) high resistance to chemical attack such as acids and alkalis, and 4) low noise emission (Holmberg and Matthews, 2009). However, polymers also have such limitations as, 1) poor wear resistance, 2 visco-elastic and creep behaviors, 3) lower ultimate strength and elastic modulus than metals, typically by a factor of ten, 4) relatively high thermal expansion coefficient (dimensional stability problem), 5) very low thermal conductivities (poor dissipation of frictional heat), and 6) low limiting temperatures (< 300°C, thus easy softening, melting, oxidation and thermal degradation). Usually, therefore, single component polymers are weak for external load and hardly meet most of the tribological requirements. However, in the composite and hybrid forms these days, polymers satisfy performance requirement for specific applications, often surpassing other traditional materials such as metals and ceramics in tribological point of view. 11PDF Image | TRIBOLOGY OF POLYMERIC COATINGS FOR AGGRESSIVE BEARING APPLICATIONS
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