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Time economic lifetime assessment for high performance thermal barrier coating systems

Bartsch, Marion and Baufeld, Bernd and Dalkilic, Serdar and Mircea, Iulian and Lambrinou, Konstantza and Leist, Thorsten and Yan, Jin and Karlsson, Anette M. (2006) Time economic lifetime assessment for high performance thermal barrier coating systems. Key Engineering Materials, 333, pp. 147-154. Trans Tech Publications, Switzerland. ISSN [1013-9826]

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Abstract

Strategies for time economic lifetime assessment of thermal barrier coatings (TBC) in service are described and discussed on the basis of experimental results, achieved on material systems with coatings applied by electron beam physical vapour deposition. Service cycles for gas turbine blades have been simulated on specimens in thermo-mechanical fatigue tests, accelerating the fatigue processes by an increase of load frequency. Time dependent changes in the material system were imposed by a separate ageing, where the samples where pre-oxidized, before the fatigue test. Results of thermo-mechanical fatigue tests on pre-aged and as-coated specimens gave evidence of interaction between fatigue and ageing processes. An alternative approach is used, which is focused on the evolution of a failure relevant damage parameter in the TBC system. The interfacial fracture toughness was selected as a damage parameter, since one important failure mode of TBCs is the spallation near the interface between the metal and the ceramic. Fracture mechanical experiments based on indentation methods have been evaluated for monitoring the evolution of the interfacial fracture toughness as a function of ageing time. It was found that the test results were influenced by both changes of the interface (which is critical in service) and changes in the surrounding material.

Item URL in elib:https://elib.dlr.de/45985/
Document Type:Article
Title:Time economic lifetime assessment for high performance thermal barrier coating systems
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Bartsch, MarionUNSPECIFIEDUNSPECIFIED
Baufeld, BerndKatholieke Universiteit Leuven, BelgiumUNSPECIFIED
Dalkilic, SerdarAnadoulu University, Eskisehir, TurkeyUNSPECIFIED
Mircea, IulianUNSPECIFIEDUNSPECIFIED
Lambrinou, KonstantzaKatholieke Universiteit Leuven, BelgiumUNSPECIFIED
Leist, ThorstenTechnische Universität DarmstadtUNSPECIFIED
Yan, JinUniversity of Delaware, DE, USAUNSPECIFIED
Karlsson, Anette M.University of Delaware, DE, USAUNSPECIFIED
Date:2006
Journal or Publication Title:Key Engineering Materials
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:Yes
Volume:333
Page Range:pp. 147-154
Publisher:Trans Tech Publications, Switzerland
ISSN:[1013-9826]
Status:Published
Keywords:Lifetime assessment, Thermal Barrier Coating, accelerated testing, damage parameter
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:Propulsion Systems (old)
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Virtual Engine and Validation Methods (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research
Deposited By: Bartsch, Dr.-Ing. Marion
Deposited On:08 Dec 2006
Last Modified:27 Apr 2009 13:18

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