Title

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

Authors

Authors

K. Knipe; A. Manero; S. F. Siddiqui; C. Meid; J. Wischek; J. Okasinski; J. Almer; A. M. Karlsson; M. Bartsch;S. Raghavan

Comments

Authors: contact us about adding a copy of your work at STARS@ucf.edu

Abbreviated Journal Title

Nat. Commun.

Keywords

STRESS; OXIDATION; SYSTEMS; SCALES; OXIDE; DELAMINATION; MECHANISMS; GRADIENT; DAMAGE; ALLOY; Multidisciplinary Sciences

Abstract

The mechanical behaviour of thermal barrier coatings in operation holds the key to under-standing 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.

Journal Title

Nature Communications

Volume

5

Publication Date

1-1-2014

Document Type

Article

Language

English

First Page

7

WOS Identifier

WOS:000340658700001

ISSN

2041-1723

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