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Microstructure characteristics and temperature dependent local elastic response of EB-PVD thermal barrier coatings examined by in-situ synchrotron X-ray diffraction

Bartsch, Marion and Knipe, Kevin and Manero, Albert and Sofronsky, Stephen and Meid, Carla and Wischek, Janine and Smith, Matthew and Lacdao, Claudine and Okasinski, John and Almer, Jonathan and Karlsson, Anette M. and Raghavan, Seetha (2015) Microstructure characteristics and temperature dependent local elastic response of EB-PVD thermal barrier coatings examined by in-situ synchrotron X-ray diffraction. 39th International Conference & Exposition on Advanced Ceramics & Composites, 25.-30. Jan. 2015, Daytona, U.S.A..

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Abstract

Elastic properties of the constituents of a coating system are basic input data for stress analyses. In the case of EB-PVD thermal barrier coatings elastic properties of the ceramic topcoat depend on temperature and stress state, with the latter controlled by (1) the assembly of the different layers, (2) the mismatch of their elastic properties and thermal expansion coefficients, (3) their thermal conductivities, (4) the residual stresses and (5) the temperature field. Furthermore, elastic topcoat properties are non-uniform across the coating thickness due to gradients in microstructure parameters such as porosity and column spacing. For determining comprehensive temperature- and stressdependent elastic topcoat properties local strains were measured by means of high energy X-ray diffraction. Tubular coated specimens were loaded with systematically varying thermal and mechanical loads while recording the strains in situ. Test parameters were surface temperature, applied mechanical load, and heat flux through the specimens’ wall, latter controlled by internal cooling of the tubular specimen. The topcoat surface was heated by infrared radiation up to 1000°C. For capturing ageing effects associated to microstructural evolution due to sintering a pre-aged specimen was investigated besides such in as-coated condition.

Item URL in elib:https://elib.dlr.de/98275/
Document Type:Conference or Workshop Item (Speech)
Title:Microstructure characteristics and temperature dependent local elastic response of EB-PVD thermal barrier coatings examined by in-situ synchrotron X-ray diffraction
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Bartsch, Marionmarion.bartsch (at) dlr.deUNSPECIFIED
Knipe, KevinUniversity of Central Florida, Orlando, FL, USAUNSPECIFIED
Manero, AlbertUniversity of Central Florida, Orlando, FL, USAUNSPECIFIED
Sofronsky, StephenUniversity of Central Florida, Orlando, FL, USAUNSPECIFIED
Meid, Carlacarla.meid (at) dlr.deUNSPECIFIED
Wischek, Janinejanine.wischek (at) dlr.deUNSPECIFIED
Smith, MatthewCleveland State University, Ohio, USAUNSPECIFIED
Lacdao, ClaudineCleveland State University, Ohio, USAUNSPECIFIED
Okasinski, JohnAdvanced Photon Source, Argonne National Laboratory, Argonne, IllinoisUNSPECIFIED
Almer, JonathanAdvanced Photon Source, Argonne National Laboratory, Argonne, IllinoisUNSPECIFIED
Karlsson, Anette M.Cleveland State University, Ohio, USAUNSPECIFIED
Raghavan, SeethaUniversity of Central Florida, Orlando, FL, USAUNSPECIFIED
Date:28 January 2015
Refereed publication:No
Open Access:No
In DOAJ:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Thermal barrier coating, elastic properties, microstructure, X-ray diffraction
Event Title:39th International Conference & Exposition on Advanced Ceramics & Composites
Event Location:Daytona, U.S.A.
Event Type:international Conference
Event Dates:25.-30. Jan. 2015
Organizer:The American Ceramic Society
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:28 Sep 2015 08:53
Last Modified:28 Sep 2015 08:53

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