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Testing of free standing EB-PVD Thermal Barrier Coatings

Bartsch, Marion and Fuchs, Uwe and Xu, Jianmin (2009) Testing of free standing EB-PVD Thermal Barrier Coatings. In: Proceedings of the Second German-Japanes Workshop on Thermal Barrier Coating Systemes for Gas Turbines, USB-Paper D2-2. Second German-Japanes Workshop on Thermal Barrier Coating Systemes for Gas Turbines, Kyoto, Japan.

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Thermal barrier coatings (TBC) processed by electron beam physical vapor deposition (EB-PVD) show complex deformation behavior due to their columnar microstructure and multi-scale porosity. The existing data for the elastic properties of EB-PVD coatings varies in a wide range, depending on the measurement method. In most cases, the fragile EB-PVD coatings are tested on the substrate, onto which they were deposited. Since the ceramic coatings are deposited onto metallic substrates, having about 1000°C, compressive residual stresses develop in the coating after cooling down. Since the deformation behavior of EB-PVD coatings is known to be stress dependent, the residual stresses cannot be calculated without knowledge of the stress-strain response, and without knowledge of the residual stress the elastic properties cannot be measured correctly. To overcome this dilemma, tubular free standing EB-PVD coating samples with a thickness of 250µm have been processed and tested in compression at room temperature. For introducing the mechanical load safely into the gauge length a soft clamping has been developed, and the strain was measured using a contact-free laser extensometer. Several subsequent loading and unloading cycles were performed on specimens with different thermal pre heat treatments. Specimens in as coated condition displayed non-linear stress-strain behavior, showing increasing stiffness with increasing compressive stress. Long term thermally aged specimens showed higher stiffness than as processed specimens and linear stress-strain behaviour. The data measured on the free standing tubular specimens are compared to the data obtained from the same coating system but using different testing methods.

Item URL in elib:https://elib.dlr.de/61353/
Document Type:Conference or Workshop Item (Speech, Paper)
Title:Testing of free standing EB-PVD Thermal Barrier Coatings
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Xu, JianminRolls Royce DeutschlandUNSPECIFIEDUNSPECIFIED
Date:29 May 2009
Journal or Publication Title:Proceedings of the Second German-Japanes Workshop on Thermal Barrier Coating Systemes for Gas Turbines
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Volume:USB-Paper D2-2
EditorsEmailEditor's ORCID iDORCID Put Code
Okazaki, MasakazuNagaoka University of TechnologyUNSPECIFIEDUNSPECIFIED
Keywords:Thermal Barrier Coatings, elastic response
Event Title:Second German-Japanes Workshop on Thermal Barrier Coating Systemes for Gas Turbines
Event Location:Kyoto, Japan
Event Type:international Conference
Organizer:The Society of Material Science Japan (JSMS)
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:other
DLR - Research area:Aeronautics
DLR - Program:L - no assignment
DLR - Research theme (Project):L - Low-Emission Air Traffic (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Experimental and Numerical Methods
Deposited By: Bartsch, Dr.-Ing. Marion
Deposited On:03 Dec 2009 15:25
Last Modified:03 Dec 2009 15:25

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