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Elastic and inelastic mechanical behaviour of free standing EB-PVD thermal barrier coatings

Bartsch, Marion and Fuchs, Uwe and Xu, Jianmin (2009) Elastic and inelastic mechanical behaviour of free standing EB-PVD thermal barrier coatings. In: Seminar on Material Science - Department of Intelligent Mechanical Engineering. Seminar on Materials Science - Department of Intelligent Mechanical Engineering, 2. Juni 2009, Fukuoka, 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/61355/
Document Type:Conference or Workshop Item (Speech)
Title:Elastic and inelastic mechanical behaviour of free standing EB-PVD thermal barrier coatings
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Xu, JianminRoll Royce DeutschlandUNSPECIFIEDUNSPECIFIED
Date:2 June 2009
Journal or Publication Title:Seminar on Material Science - Department of Intelligent Mechanical Engineering
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:Thermal Barrier Coating System, EB-PVD, elastic deformation, creep
Event Title:Seminar on Materials Science - Department of Intelligent Mechanical Engineering
Event Location:Fukuoka, Japan
Event Type:Other
Event Dates:2. Juni 2009
Organizer:Prof. Shijie Zhu, Department of Intelligent Mechanical Engineering, Fukuoka Institute of Technology
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 15:23
Last Modified:03 Dec 2009 15:23

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