Abstract
Gas turbines have been developed to be used in a wide variety of applications ranging from aeroengines to large-scale power generation. Each of these applications presents its own particular set of challenges. However, many of these systems experience damage related to oxidation and hot corrosion in the hot gas paths of the gas turbines. These forms of damage are related to a combination of the operating conditions of the particular gas turbine and its components together with contaminants entering the hot gas paths via the air or fuel streams. Such types of oxidation and hot corrosion are well-known and characterized, with qualitative descriptions of the potential mechanisms available. However, quantitative data on the various damaging reactions are not readily available. The development of models to enable the prediction of such damage is the subject of current research. The use of new materials designed for strength rather than corrosion resistance is proving to be problematic for some gas turbine applications. Increasing gas turbine efficiencies, while also widening the range of potential fuels and power generation systems, is presenting a new series of challenges in terms of the oxidation and hot corrosion performance of components in gas turbine hot gas paths.
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