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Y2O3-ZrO2 ratio studies for CMAS resistant thermal barrier coatings prepared by EB-PVD

Gomez, J. Gomez and Naraparaju, Ravisankar and Mechnich, Peter and Schulz, Uwe and Chintalapalle, Ramana (2018) Y2O3-ZrO2 ratio studies for CMAS resistant thermal barrier coatings prepared by EB-PVD. Thermal Barrier Coatings 5, 25-29 th June, Irsee, Germany.

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Abstract

Thermal barrier coatings based on the yttria-zirconia system with compositions over 50 mol. % YO1.5 rest ZrO2 have shown potential as CMAS/Volcanic ash (VA) resistant coatings1–4. However, it is still not clear what Y-Zr ratio is the optimal to promote effective CMAS/VA arrest. A previous study has shown that pure Y2O3 coatings are not as effective as their yttria-zirconia counterpart4 making this topic of high relevance for the development of CMAS/VA resistant coatings. Therefore, this study is based on the determination of the optimal Y-Zr ratio for EB-PVD TBCs produced with compositions ranging from 40-70 mol. % YO1.5. Preliminary results for short term infiltration (up to 7 min.) at 1250°C with natural VA from the Eyjafjallajökull volcano show a tendency of increased infiltration resistance with coatings having a higher yttria composition (70 mol. %) seen from Figure 15. The experiments indicate formation of reaction products when a 50 mol. % YO1.5 coating composition is used and no significant reaction with lower yttria compositions. Thus, it appears that the threshold point to saturate the glass promoting formation of reaction products (apatite and garnet) is for compositions with at least 50 mol % YO1.5. A systematic study will be presented to determine the optimum yttia content in EB-PVD coatings for effective glass crystallization.

Item URL in elib:https://elib.dlr.de/123673/
Document Type:Conference or Workshop Item (Poster)
Title:Y2O3-ZrO2 ratio studies for CMAS resistant thermal barrier coatings prepared by EB-PVD
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Gomez, J. GomezUNSPECIFIEDUNSPECIFIED
Naraparaju, RavisankarRavisankar.Naraparaju (at) dlr.deUNSPECIFIED
Mechnich, PeterUNSPECIFIEDUNSPECIFIED
Schulz, UweUwe.Schulz (at) dlr.dehttps://orcid.org/0000-0003-0362-8103
Chintalapalle, RamanaUNSPECIFIEDUNSPECIFIED
Date:29 November 2018
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:TBcs, CMAS, Yttrai rich TBCS
Event Title:Thermal Barrier Coatings 5
Event Location:Irsee, Germany
Event Type:international Conference
Event Dates:25-29 th June
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
Institute of Materials Research > Structural and Functional ceramics
Deposited By: Naraparaju, Dr Ravisankar
Deposited On:29 Nov 2018 10:03
Last Modified:29 Nov 2018 10:03

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