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Erosion behavior of EB-PVD 7YSZ coatings under corrosion/erosion regime: Effect of TBC microstructure and the CMAS chemistry

Steinberg, Lars and Naraparaju, Ravisankar and Heckert, Mirko and Mikulla, Christoph and Schulz, U. and Leyens, C. (2018) Erosion behavior of EB-PVD 7YSZ coatings under corrosion/erosion regime: Effect of TBC microstructure and the CMAS chemistry. Journal of the European Ceramic Society. Elsevier. ISSN 0955-2219

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Abstract

Aero-engines operating in dust-laden environments often encounter a lot of dust/sand that causes a severe problem to the TBCs by means of erosion. As the turbine entry temperatures are rising, molten sand is also a big concern to the life-time of TBCs. This paper deals with the TBC behavior under the combined influence of erosion and corrosion attack. Variations in TBC morphology, CMAS infiltration time and CMAS composition and their influence on the erosion resistance at room temperature were investigated. Two different EB-PVD 7YSZ morphologies consisting of a different porosity arrangement were tested in the erosion/corrosion regime. The more ‘Feathery’ structure has a better resistance to erosion compared to a more columnar ‘Normal’ structure, which leads to less degradation of the TBC. However, under the influence of CMAS infiltration the effect was found to be reversed. In general, CMAS-infiltrated EB-PVD TBCs exhibit a higher erosion resistance than the non-infiltrated ones

Item URL in elib:https://elib.dlr.de/121520/
Document Type:Article
Title:Erosion behavior of EB-PVD 7YSZ coatings under corrosion/erosion regime: Effect of TBC microstructure and the CMAS chemistry
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Steinberg, LarsTU dresdenUNSPECIFIED
Naraparaju, Ravisankarravisankar.naraparaju (at) dlr.deUNSPECIFIED
Heckert, MirkoUNSPECIFIEDUNSPECIFIED
Mikulla, ChristophUNSPECIFIEDUNSPECIFIED
Schulz, U.UNSPECIFIEDUNSPECIFIED
Leyens, C.UNSPECIFIEDUNSPECIFIED
Date:2018
Journal or Publication Title:Journal of the European Ceramic Society
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Publisher:Elsevier
ISSN:0955-2219
Status:Published
Keywords:TBC, Erosion, CMAS, EB-PVD, 7YSZ
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 - Turbine Technologies
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > High Temperature and Functional Coatings
Deposited By: Naraparaju, Dr Ravisankar
Deposited On:08 Nov 2018 11:27
Last Modified:08 Nov 2018 11:27

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