Thermocycling of ceramic-coated turbomachine components produces high thermomechanical stresses that are mitigated by plasticity and creep but aggravated by oxidation, with residual stresses exacerbated by all three. These residual stresses, coupled with the thermocyclic loading, lead to high compressive stresses that cause the coating to spall. In the paper a ceramic-coated gas path seal is modeled with consideration given to creep, plasticity, and oxidation. The resulting stresses and possible failure modes are discussed.
NASA Technical Memorandum
Padovan, J.; Chung, Benjamin T.F.; McDonald, Glen E.; and Hendricks, Robert C., "Thermomechanical Design Criteria for Zr02-Y203 Coated Surfaces" (1987). Mechanical Engineering Faculty Research. 1078.