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Piezospectroscopic evaluation and damage identification for thermal barrier coatings subjected to simulated engine environments

Manero, Albert and Selimov, Alex and Fouliard, Quentin and Knipe, Kevin and Wischek, Janine and Meid, Carla and Karlsson, Anette M. and Bartsch, Marion and Raghavan, Seetha (2016) Piezospectroscopic evaluation and damage identification for thermal barrier coatings subjected to simulated engine environments. Surface and Coatings Technology. Elsevier. DOI: 10.2016/j.surfcoat.2016.09.059 ISSN 0257-8972

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Abstract

The application of high temperature ceramic coatings has enabled aircraft and power generation turbines to run at higher inlet temperatures for greater efficiency. Their use extends the lifetime of the superalloy blades that bear thermal gradients and mechanical loads during operation. In this work, ex-situ photoluminescence spectroscopy was conducted to investigate the stresses within the thermally grown oxide of a thermal barrier coated tubular sample following complex realistic conditions, such as induced thermal gradients, and long duration aging. The resulting high spatial resolution stress contour maps highlight the development of the thermally grown oxide in response to the complex conditions. The outcomes Highlight both the role of the aging process and the oxide growth’s influence on the stress profile which varies spatially across the specimen. The results further provide early detection of micro-damaged zones in the oxide layer nondestructively. Improving the understanding of the coating system’s response to loading conditions will allow for more accurate system modeling and early detection and monitoring of damage zones, which is critical for improving efficiency and longevity of aircraft and power generation turbines.

Item URL in elib:https://elib.dlr.de/108396/
Document Type:Article
Title:Piezospectroscopic evaluation and damage identification for thermal barrier coatings subjected to simulated engine environments
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Manero, Albertuniversity of central florida, orlando, fl, usaUNSPECIFIED
Selimov, Alexuniversity of central florida, orlando, fl, usaUNSPECIFIED
Fouliard, Quentinuniversity of central florida, orlando, fl, usaUNSPECIFIED
Knipe, Kevinuniversity of central florida, orlando, fl, usaUNSPECIFIED
Wischek, Janinejanine.wischek (at) dlr.deUNSPECIFIED
Meid, Carlacarla.meid (at) dlr.deUNSPECIFIED
Karlsson, Anette M.cleveland state university, ohio, usaUNSPECIFIED
Bartsch, Marionmarion.bartsch (at) dlr.dehttps://orcid.org/0000-0002-3952-2928
Raghavan, Seethauniversity of central florida, orlando, fl, usaUNSPECIFIED
Date:29 September 2016
Journal or Publication Title:Surface and Coatings Technology
Refereed publication:Yes
Open Access:No
In DOAJ:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.2016/j.surfcoat.2016.09.059
Publisher:Elsevier
ISSN:0257-8972
Status:Published
Keywords:Thermal barrier coatings, Thermal gradient mechanical load, Damage identification
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:propulsion systems
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Virtual Engine and Validation methods
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Experimental and Numerical Methods
Deposited By: Bartsch, Dr.-Ing. Marion
Deposited On:01 Dec 2016 14:25
Last Modified:10 Apr 2019 11:55

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