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Effects of ageing on mechanical properties and damage behavior of EB-PVD thermal barrier coating systems

Bartsch, Marion and Chernova, Liudmila and Dzodzovic, Nicolas and Hernandez, Mercedes T. and Karlsson, Anette M. and Zotov, Nikolay and Eggeler, Gunther (2011) Effects of ageing on mechanical properties and damage behavior of EB-PVD thermal barrier coating systems. 35th International Conference & Exposition on Advanced Ceramics & Composites, 23.-28. Jan. 2011, Daytona Beach, Florida, USA.

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Abstract

Multilayered materials subjected to high temperatures exhibit time and temperature dependent microstructure evolution, which alter the mechanical properties of the respective components and consequently the damage behavior of the layered structure. The here presented investigation was motivated by the observation that in complex thermal mechanical fatigue tests pre aged and as coated specimens of a thermal barrier coating (TBC) system showed completely different damage behaviour. The pre aged specimens displayed perpendicular to the mechanical fatigue load cracks in the thermally grown oxide (TGO) between ceramic top coat and underlying metallic bond coat. The cracks started in the TGO, propagated into top coat and bond coat, entailing a scenario of local oxidation and crack kinking at the bond coat, and finally spallation of the ceramic coating. In contrast, the as coated TBC-system did not show crack formation even after a higher number of test cycles. In order to explain the effect of ageing on the crack initiation, changes of the TBC microstructure and related mechanical properties have been investigated experimentally (scanning electron microscopy, nanoindentation) and by means of finite element analyses. The investigations suggest that only in the aged TBC system tensile stresses can accumulate in the TGO, which are sufficient to initiate the observed cracks.

Item URL in elib:https://elib.dlr.de/71547/
Document Type:Conference or Workshop Item (Speech)
Title:Effects of ageing on mechanical properties and damage behavior of EB-PVD thermal barrier coating systems
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Bartsch, Marionmarion.bartsch (at) dlr.deUNSPECIFIED
Chernova, LiudmilaLiudmila.Chernova (at) dlr.deUNSPECIFIED
Dzodzovic, NicolasDLR WF-ENUNSPECIFIED
Hernandez, Mercedes T.University of DelawareUNSPECIFIED
Karlsson, Anette M.University of DelawareUNSPECIFIED
Zotov, NikolayRuhr-Universität BochumUNSPECIFIED
Eggeler, GuntherRuhr-Universität BochumUNSPECIFIED
Date:25 January 2011
Open Access:No
In DOAJ:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:thermal barrier coating, TBC, material model, thermal mechanical fatigue, ageing
Event Title:35th International Conference & Exposition on Advanced Ceramics & Composites
Event Location:Daytona Beach, Florida, USA
Event Type:international Conference
Event Dates:23.-28. Jan. 2011
Organizer:American Ceramic Society
HGF - Research field:Aeronautics, Space and Transport
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 > Experimental and Numerical Methods
Deposited By: Bartsch, Dr.-Ing. Marion
Deposited On:14 Nov 2011 10:24
Last Modified:14 Nov 2011 10:24

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