Abstract

Present day high strength, oxidation resistant materials for advanced heat engine applications are susceptible to contact stress damage at ceramic/ ceramic interfaces. It has been suggested that substantial reductions in surface damage and strength loss under sliding contact can be attained by the application of a thin ceramic coating. However, the stringent conditions imposed by heat engine environments mandates that these coatings be adherent, capable of withstanding thermal cycling, and oxidation resistant at extremely high temperatures. Finite element analysis and equilibrium thermodynamic calculations were used to aid in the design of a coating configuration that can achieve these objectives. The conceptual design and development of the proposed coating is discussed.

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