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Microstructure Modification of EB-PVD GZO TBCs and the effect on their Resistance against Siliceous CMAS melts

Mikulla, Christoph and Naraparaju, Ravisankar and Mechnich, Peter and Schulz, Uwe (2022) Microstructure Modification of EB-PVD GZO TBCs and the effect on their Resistance against Siliceous CMAS melts. ECI Thermal and Environmental Barrier Coatings VI 2022, 2022-06-19 - 2022-06-24, Irsee, Deutschland.

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Gadolinium zirconate TBCs are proven to be very effective in restricting the CMAS attack by forming quick crystalline reaction products such as apatite and garnet that seal the porosity against infiltration. However, the microstructural effects on the efficacy of GZO against CMAS attack is less explored and especially the microstructures that are obtained by the Electron Beam-Physical Vapor Deposition method. Several distinct GZO microstructures are created by EB-PVD deposition method and assessed with regard to their microstructural characteristics. The response of elected microstructures to CMAS melts with different chemical compositions was studied for up to 50h at 1250°C. An optimized columnar microstructures with smaller intercolumnar gaps and long featherarms was found to significantly lower the CMAS infiltration compare to those microstructures created with standard parameters. The formation the reaction products such as Apatite, Fluorite, Garnet etc. was found to be strongly dependent on the CMAS melt composition as well as on the local microstructure. Garnet, which formed as a continuous layer on top of Apatite and Fluorite, is identified as a beneficial reaction product that improves the CMAS resistance, as it slows down the consumption of GZO, binds high amounts of CMAS and stabilizes the subjacent Apatite-Fluorite reaction layer.

Item URL in elib:https://elib.dlr.de/187157/
Document Type:Conference or Workshop Item (Speech, Poster)
Title:Microstructure Modification of EB-PVD GZO TBCs and the effect on their Resistance against Siliceous CMAS melts
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Mikulla, ChristophUNSPECIFIEDhttps://orcid.org/0000-0001-9367-8301UNSPECIFIED
Naraparaju, RavisankarUNSPECIFIEDhttps://orcid.org/0000-0002-3944-1132UNSPECIFIED
Mechnich, PeterUNSPECIFIEDhttps://orcid.org/0000-0003-4689-8197UNSPECIFIED
Schulz, UweUNSPECIFIEDhttps://orcid.org/0000-0003-0362-8103UNSPECIFIED
Date:23 June 2022
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Keywords:CMAS, TBCs, Gadolinium Zirconate, rare earth zirconates, EB-PVD
Event Title:ECI Thermal and Environmental Barrier Coatings VI 2022
Event Location:Irsee, Deutschland
Event Type:international Conference
Event Start Date:19 June 2022
Event End Date:24 June 2022
Organizer:Engineering Conferences International
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
Institute of Materials Research > Structural and Functional ceramics
Deposited By: Mikulla, Christoph
Deposited On:04 Jul 2022 08:58
Last Modified:24 Apr 2024 20:48

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