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Defect evolution in thermal barrier coating systems under multi-axial thermomechanical loading

Baufeld, Bernd and Bartsch, Marion and Dalkilic, Serdar and Heinzelmann, Michael (2005) Defect evolution in thermal barrier coating systems under multi-axial thermomechanical loading. Surface and Coatings Technology (200), pp. 1282-1286. Elsevier B.V.. doi: 10.1016/j.surfcoat.2005.07.098.

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In service, gas turbine components with thermal barrier coatings experience high cyclic mechanical and thermal loading. Important, but not yet considered sufficiently, are the multi-axial stresses arising from thermal gradients. In this study, multi-axial stresses were simulated in laboratory experiments using a specially designed test rig. Cyclic thermomechanical fatigue experiments with radial thermal gradients (TGMF) were performed on tubular specimens consisting of a directionally densified superalloy substrate, a NiCoCrAlY bond coat, and a ceramic thermal barrier coating (TBC). The test setup enables surface temperatures of 1000°C, temperature differences over the whole wall thickness of the specimen of about 170°C, and high heating and cooling rates. The resultant defects have specific features consisting of cracks parallel to the bond coat/TBC interface. They are located within the bond coat close to this interface. Weakening thus this interface, the defects enhance TBC spallation. Finite element analyses, calculating stress distributions during the quasi-stationary condition of the TGMF test cycle at high temperature and the transient stress distributions during cooling, were used to discuss the evolution of these specific defects.

Item URL in elib:https://elib.dlr.de/19725/
Document Type:Article
Title:Defect evolution in thermal barrier coating systems under multi-axial thermomechanical loading
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Baufeld, BerndKatholieke Universiteit Leuven, BelgiumUNSPECIFIEDUNSPECIFIED
Dalkilic, SerdarAnadolou University, Eskisehir, TurkeyUNSPECIFIEDUNSPECIFIED
Heinzelmann, MichaelUniversity of Applied Science, Rheinbach, DeutschlandUNSPECIFIEDUNSPECIFIED
Journal or Publication Title:Surface and Coatings Technology
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 1282-1286
Publisher:Elsevier B.V.
Keywords:Interfaces; Defects; Nickel alloy; Zirconium oxide; Multilayer; Thermal barrier coating
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:L VU - Air Traffic and Environment (old)
DLR - Research area:Aeronautics
DLR - Program:L VU - Air Traffic and Environment
DLR - Research theme (Project):L - Quiet Air Traffic (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research
Deposited By: Bartsch, Dr.-Ing. Marion
Deposited On:02 Dec 2005
Last Modified:27 Apr 2009 04:43

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