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Indentation creep of free-standing EB-PVD thermal barrier coatings

Jan, Vit and Dorcakova, F. and Dusza, Jan and Bartsch, Marion (2007) Indentation creep of free-standing EB-PVD thermal barrier coatings. Journal of the European Ceramic Society, 28 (1), pp. 241-246. Elsevier. doi: 10.1016/j.jeurceramsoc.2007.04.011.

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The indentation creep behavior of a free-standing 7 wt%Y-ZrO2 thermal barrier coating (TBC) prepared by electron beam physical vapor deposition (EB-PVD) has been investigated. The specimens in the form of discs with 5mm in diameter and 1.2mm thickness were used for experiments in the temperature ranging from 1100 to 1300 ◦C and at stresses from 30 to 70MPa, in air. A flat-ended cylindrical indenter has been used. The strain–time relationship was recorded, and the creep exponents and activation energies of the creep have been calculated. The creep micromechanisms have been also studied by means of scanning electron microscopy. The obtained creep stress exponent varied from 0.05 to 1.12 and the obtained activation energy in the interval from 215 to 329 kJ/mol. The main creep mechanisms are densification of the sub-layers with fine columnar crystals, bending of crystals and leaning down of sets of crystals.

Item URL in elib:https://elib.dlr.de/51872/
Document Type:Article
Title:Indentation creep of free-standing EB-PVD thermal barrier coatings
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Jan, VitToyota Technological Institute, Nagoya, JapanUNSPECIFIEDUNSPECIFIED
Dorcakova, F.Slovak Academy of Science, KosiceUNSPECIFIEDUNSPECIFIED
Dusza, JanSlovak Academy of Science, KosiceUNSPECIFIEDUNSPECIFIED
Date:July 2007
Journal or Publication Title:Journal of the European Ceramic Society
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 241-246
Keywords:Creep; ZrO2; Engine components; Thermal barrier coatings
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 - Low-Emission Air Traffic (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research
Deposited By: Bartsch, Dr.-Ing. Marion
Deposited On:16 Nov 2007
Last Modified:27 Apr 2009 14:29

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