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Title: On the role of imperfections in the failure of a thermal barrier coating made by electron beam deposition

Abstract

An impression test has been used to explore the remnant toughness and the delamination characteristics of thermal barrier coatings (TBCs) after extended thermal exposure. The delamination trajectory is found to change as the thermally grown oxide (TGO) thickens. At small thicknesses, delamination occurs predominantly within the TGO and TBC. With a thicker TGO, developed after 100 h exposure at 1,100 C, the delamination extends predominantly along the TGO/bond coat interface, but with small oxide domains remaining embedded in the bond coat. The changes in the interface adhesion and the mechanics responsible for this transition are addressed, along with a discussion of the role of morphological imperfections in the TGO in failure nucleation. A method for determining the effective in-plane modulus of the TBC from the curvature of decohered TGO/TBC bilayers is also presented.

Authors:
;
Publication Date:
Research Org.:
Princeton Univ., NJ (US)
OSTI Identifier:
20075936
Resource Type:
Journal Article
Journal Name:
Acta Materialia
Additional Journal Information:
Journal Volume: 48; Journal Issue: 8; Other Information: PBD: 11 May 2000; Journal ID: ISSN 1359-6454
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; MORPHOLOGY; FRACTURE PROPERTIES; OXIDATION; METALS; COATINGS; THERMAL SHIELDS; INTERFACES; TEMPERATURE RANGE 1000-4000 K; DEFECTS

Citation Formats

Mumm, D.R., and Evans, A.G. On the role of imperfections in the failure of a thermal barrier coating made by electron beam deposition. United States: N. p., 2000. Web. doi:10.1016/S1359-6454(99)00473-5.
Mumm, D.R., & Evans, A.G. On the role of imperfections in the failure of a thermal barrier coating made by electron beam deposition. United States. doi:10.1016/S1359-6454(99)00473-5.
Mumm, D.R., and Evans, A.G. Thu . "On the role of imperfections in the failure of a thermal barrier coating made by electron beam deposition". United States. doi:10.1016/S1359-6454(99)00473-5.
@article{osti_20075936,
title = {On the role of imperfections in the failure of a thermal barrier coating made by electron beam deposition},
author = {Mumm, D.R. and Evans, A.G.},
abstractNote = {An impression test has been used to explore the remnant toughness and the delamination characteristics of thermal barrier coatings (TBCs) after extended thermal exposure. The delamination trajectory is found to change as the thermally grown oxide (TGO) thickens. At small thicknesses, delamination occurs predominantly within the TGO and TBC. With a thicker TGO, developed after 100 h exposure at 1,100 C, the delamination extends predominantly along the TGO/bond coat interface, but with small oxide domains remaining embedded in the bond coat. The changes in the interface adhesion and the mechanics responsible for this transition are addressed, along with a discussion of the role of morphological imperfections in the TGO in failure nucleation. A method for determining the effective in-plane modulus of the TBC from the curvature of decohered TGO/TBC bilayers is also presented.},
doi = {10.1016/S1359-6454(99)00473-5},
journal = {Acta Materialia},
issn = {1359-6454},
number = 8,
volume = 48,
place = {United States},
year = {2000},
month = {5}
}