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Tailoring the EB-PVD columnar microstructure to mitigate the infiltration of CMAS in 7YSZ thermal barrier coatings

Naraparaju, Ravisankar and Hüttermann, Mario and Schulz, Uwe and Mechnich, Peter (2016) Tailoring the EB-PVD columnar microstructure to mitigate the infiltration of CMAS in 7YSZ thermal barrier coatings. Journal of the European Ceramic Society. Elsevier. DOI: 10.1016/j.jeurceramsoc.2016.07.027 ISSN 0955-2219

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Abstract

The CMAS associated degradation of 7YSZ TBC layers is one of the serious problems in the aero enginesthat operate in dusty environments. CMAS infiltrates into TBC at high temperatures and stiffens the TBCwhich ultimately loses its strain tolerance and gets delaminated. The EB-PVD technique is used to coatTBCs exhibiting a columnar microstructure on parts such as blades and on vanes. By varying the EB-PVDprocess parameters, columnar morphology and porosity of the 7YSZ coating is changed and its effect onthe CMAS infiltration behaviour is studied in detail. Two different TBC pore geometries were created andinfiltration experiments were carried out at 1250◦C and 1225◦C for different time intervals. The 7YSZcoating with more ‘feathery’ features has resulted in higher CMAS resistance by at least by a factor of 2than its less ‘feathery’ counterpart. These results are explained on the basis of a proposed physical model.

Item URL in elib:https://elib.dlr.de/107378/
Document Type:Article
Title:Tailoring the EB-PVD columnar microstructure to mitigate the infiltration of CMAS in 7YSZ thermal barrier coatings
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Naraparaju, Ravisankarravisankar.naraparaju (at) dlr.deUNSPECIFIED
Hüttermann, MarioUNSPECIFIEDUNSPECIFIED
Schulz, UweUwe.Schulz (at) dlr.deUNSPECIFIED
Mechnich, PeterPeter.Mechnich (at) dlr.deUNSPECIFIED
Date:2016
Journal or Publication Title:Journal of the European Ceramic Society
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1016/j.jeurceramsoc.2016.07.027
Publisher:Elsevier
ISSN:0955-2219
Status:Published
Keywords:CMAS, Thermal barrier coatings, 7YSZ, CMAS Infiltration, EB-PVD coatings
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:30 Nov 2016 06:33
Last Modified:31 Jul 2019 20:04

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