Abstract
Lubrication plays a key role in reducing friction and wear. This chapter outlines the range of materials that can be used as lubricants and describes the composition and properties of oils and greases, including widely-used additives. It presents the fundamental concepts of viscosity and describes the variation of viscosity with temperature and pressure. Models are presented for hydrodynamic and elastohydrodynamic lubrication (EHL), in linear sliding and rotating journal bearings. The roles of friction modifiers, antiwear additives and EP additives in boundary lubrication are explained. The properties of the most common solid lubricants, lamellar solids and linear polymers, are discussed.
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