Lifetime Modeling of Thermal Barrier Coatings

Doctoral thesis (2009)

Authors

Contributors

R. De Borst (promotor)
S.R. Turteltaub (promotor)
Department
Mechanics, Aerospace Structures and Materials (Aerospace Engineering) (TU Delft)
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Published Date

08-05-2009

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Faculty

Aerospace Engineering

Department

Mechanics, Aerospace Structures and Materials

Abstract

Thermal barrier coatings (TBCs) are applied in gas turbines to enhance their thermal efficiency by isolating the metallic components from the aggressive hot gas. TBC lifetime is limited by damage processes originating at internal interfaces, which may ultimately lead to delamination and spallation. In the present thesis constitutive models are presented for the coating components and the most detrimental failure mechanisms. To simulate the thermomechanical failure response, the numerical models are applied to boundary value problems representative of conditions typically encountered during service and/or experiments. Based on the results, recommendations are given for TBC manufacturing.