SEDL / STP / STP1428-EB / STP11428S

Damage and Failure Mechanisms of Thermal Barrier Coatings under Thermomechanical Fatigue Loadings

Tzimas, E
Scientific officer, European Commission, DG-JRC, Institute for Energy, ZG Petten,

Hähner, P
Scientific officer, European Commission, DG-JRC, Institute for Energy, ZG Petten,

Moretto, P
Scientific officer, European Commission, DG-JRC, Institute for Energy, ZG Petten,

Peteves, SD
Scientific officer, European Commission, DG-JRC, Institute for Energy, ZG Petten,

Bressers, J
Retired scientific officer, European Commission, DG-JRC, Institute for Energy,

Pages: 15    Published: Jan 2003

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Abstract

The mechanical behavior of thermal barrier coated (TBC) systems under the influence of combined thermal and mechanical cyclic loading has been studied using a prototype experimental configuration that simulates realistically the operational conditions within a gas turbine. This study has demonstrated that the failure mechanisms of TBC systems under thermomechanical fatigue (TMF) conditions depend on the range of applied mechanical strain and on the phase angle between thermal and mechanical loading. The results highlight the importance of proper design of TMF experiments so that the failure mechanisms activated and studied during the experiments are the mechanisms responsible for the failure of TBC systems under service conditions.