INTERMETALLIC COATINGS FOR HIGH TEMPERATURE APPLICATIONS - A REVIEW

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Abstract
Protection of high temperature materials in the aggressive environment is achieved by the use of coatings. Various types of high temperature coatings have been developed over the years to accomplish this protection. One class of coating is based exclusively on the use of intermetallic compounds such as aluminides and silicides of transition and refractory metals. These intermetallic coatings are produced by pack cementation, chemical vapor deposition, slurry, hot-dipping and detonation gun techniques. Of all these techniques, pack cementation and chemical vapor deposition processes are widely popular. The basic principles of these two processes and the recent advances in terms of understanding the underlying thermodynamic and kinetic aspects are briefly reviewed. Industrial applications of these coatings are also discussed.