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Influence of Microstructure on CMAS Resistance and Lifetime of EB-PVD Gadolinium Zirconate TBCs

Mikulla, Christoph and Naraparaju, Ravisankar and Schulz, Uwe (2020) Influence of Microstructure on CMAS Resistance and Lifetime of EB-PVD Gadolinium Zirconate TBCs. 44th International Conference on Advanced Ceramics and Composites, 26.-31. Jan. 2020, Daytona Beach, USA.

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Abstract

Thermal barrier coatings (TBCs) used in high-temperature sections of aero-engines and gas turbines are often subjected to severe degradation by molten calcium-magnesium-alumina-silica (CMAS) minerals mainly found in volcanic ashes (VA), runway dust, desert sands and air pollution. The application of reactive TBCs such as gadolinium zirconate (GZO) on the affected parts is one of the successful approaches to protect the TBCs against CMAS attack. Being exposed to molten CMAS, the coatings form crystalline reaction products that seal pores and gaps and hinder further infiltration of the deposit. However, the microstructure of these coatings plays a significant role on both the infiltration and reaction kinetics of the sacrificial layers with CMAS. GZO layers with different columnar microstructure and porosity were deposited by varying the electron beam physical vapor deposition (EB-PVD) process parameters. Infiltration experiments with CMAS or VA were carried out at 1250°C for different time intervals between 5 min and 50 h. It was found that microstructural features influence greatly the infiltration depth and reaction kinetics. Lifetime of these coatings was tested by doing thermal cyclic testing and a correlation with their microstructure is drawn.

Item URL in elib:https://elib.dlr.de/136074/
Document Type:Conference or Workshop Item (Speech)
Title:Influence of Microstructure on CMAS Resistance and Lifetime of EB-PVD Gadolinium Zirconate TBCs
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Mikulla, ChristophChristoph.Mikulla (at) dlr.deUNSPECIFIED
Naraparaju, RavisankarRavisankar.Naraparaju (at) dlr.deUNSPECIFIED
Schulz, UweUwe.Schulz (at) dlr.dehttps://orcid.org/0000-0003-0362-8103
Date:29 January 2020
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Thermal Barrier Coatings, CMAS, GZO, EB-PVD, microstructure, lifetime, Wärmedämmschicht, TBC, WDS, Mikrostruktur, Lebensdauer
Event Title:44th International Conference on Advanced Ceramics and Composites
Event Location:Daytona Beach, USA
Event Type:international Conference
Event Dates:26.-31. Jan. 2020
Organizer:The American Ceramic Society
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 (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > High Temperature and Functional Coatings
Deposited By: Mikulla, Christoph
Deposited On:19 Oct 2020 09:53
Last Modified:19 Oct 2020 09:53

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