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Microstructure Refinement of EB-PVD Gadolinium Zirconate Thermal Barrier Coatings to Improve Their CMAS Resistance

Mikulla, Christoph and Steinberg, Lars and Niemeyer, Philipp David and Schulz, Uwe and Naraparaju, Ravisankar (2023) Microstructure Refinement of EB-PVD Gadolinium Zirconate Thermal Barrier Coatings to Improve Their CMAS Resistance. Coatings, 13 (5), p. 905. Multidisciplinary Digital Publishing Institute (MDPI). doi: 10.3390/coatings13050905. ISSN 2079-6412.

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Official URL: https://www.mdpi.com/2079-6412/13/5/905


Rare-earth zirconates are proven to be very effective in restricting the CMAS attack against thermal barrier coatings (TBCs) by forming quick crystalline reaction products that seal the porosity against infiltration. The microstructural effects on the efficacy of Electron Beam-Physical Vapor Deposition gadolinium zirconate (EB-PVD GZO) against CMAS attack are explored in this study. Four distinct GZO microstructures were manufactured and the response of two selected GZO variants to different CMAS and volcanic ash melts was studied for annealing times between 10 min and 50 h at 1250°C. A significant variation in the microstructural characteristics was achieved by altering substrate temperature and rotation speed. A refined microstructure with smaller intercolumnar gaps and long feather arms lowered the CMAS infiltration by 56%-72%. Garnet phase, which formed as a continuous layer on top of apatite and fluorite, is identified as a beneficial reaction product that improves the CMAS resistance.

Item URL in elib:https://elib.dlr.de/195080/
Document Type:Article
Title:Microstructure Refinement of EB-PVD Gadolinium Zirconate Thermal Barrier Coatings to Improve Their CMAS Resistance
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Mikulla, ChristophUNSPECIFIEDhttps://orcid.org/0000-0001-9367-8301135484513
Niemeyer, Philipp DavidUNSPECIFIEDhttps://orcid.org/0000-0002-4386-2589UNSPECIFIED
Schulz, UweUNSPECIFIEDhttps://orcid.org/0000-0003-0362-8103UNSPECIFIED
Naraparaju, RavisankarUNSPECIFIEDhttps://orcid.org/0000-0002-3944-1132UNSPECIFIED
Date:11 May 2023
Journal or Publication Title:Coatings
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In ISI Web of Science:Yes
Page Range:p. 905
Publisher:Multidisciplinary Digital Publishing Institute (MDPI)
Keywords:TBCs thermal barrier coatings gadolinium zirconate GZO rare earth zirconates EB-PVD microstructure CMAS volcanic ash infiltration
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Clean Propulsion
DLR - Research area:Aeronautics
DLR - Program:L CP - Clean Propulsion
DLR - Research theme (Project):L - Advanced Materials and New Manufacturing Technologies
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > High Temperature and Functional Coatings
Deposited By: Mikulla, Christoph
Deposited On:22 May 2023 09:21
Last Modified:24 May 2023 11:02

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