This review considers the present state of coating technology. The various methods of forming a coating which have been developed are described and an attempt is made to indicate their relative advantages and disadvantages. Many of these methods are well established industrial practice, while others are only at the laboratory stage of development. Two basic types of system are considered. In the first system, the alloy composition is optimised to give enhanced oxidation resistance using either diffusion or overlay processes; in the second system, the component is coated directly with an inert stable diffusion barrier, usually an oxide layer.
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