Strain response of thermal barrier coatings captured under extreme engine environments through synchrotron X-ray diffraction

Kevin Knipe, Albert Manero, Sanna F. Siddiqui, Carla Meid, Janine Wischek, John Okasinski, Jonathan Almer, Anette M. Karlsson, Marion Bartsch and Seetha Raghavan ()
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Kevin Knipe: University of Central Florida
Albert Manero: University of Central Florida
Sanna F. Siddiqui: University of Central Florida
Carla Meid: Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR), Institut für Werkstoff-Forschung
Janine Wischek: Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR), Institut für Werkstoff-Forschung
John Okasinski: Advanced Photon Source, Argonne National Laboratory
Jonathan Almer: Advanced Photon Source, Argonne National Laboratory
Anette M. Karlsson: Cleveland State University
Marion Bartsch: Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR), Institut für Werkstoff-Forschung
Seetha Raghavan: University of Central Florida

Nature Communications, 2014, vol. 5, issue 1, 1-7

Abstract: Abstract The mechanical behaviour of thermal barrier coatings in operation holds the key to understanding durability of jet engine turbine blades. Here we report the results from experiments that monitor strains in the layers of a coating subjected to thermal gradients and mechanical loads representing extreme engine environments. Hollow cylindrical specimens, with electron beam physical vapour deposited coatings, were tested with internal cooling and external heating under various controlled conditions. High-energy synchrotron X-ray measurements captured the in situ strain response through the depth of each layer, revealing the link between these conditions and the evolution of local strains. Results of this study demonstrate that variations in these conditions create corresponding trends in depth-resolved strains with the largest effects displayed at or near the interface with the bond coat. With larger temperature drops across the coating, significant strain gradients are seen, which can contribute to failure modes occurring within the layer adjacent to the interface.

Date: 2014
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DOI: 10.1038/ncomms5559

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