Naraparaju, Ravisankar and Mikulla, Christoph and Mechnich, Peter and Kelm, Klemens and Schulz, Uwe and Gomez Chavez, Juan J (2022) Comparison of the performance of EB-PVD GZO and Yttria rich zirconate coatings against CMAS infiltration. ICACC, 23-28 January, Daytona Beach, USA.
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Abstract
This detailed study compare and contrast the calcium-magnesium-aluminosilicate (CMAS) infiltration resistance behavior of electron-beam physical vapor deposition (EB-PVD) produced gadolinium zirconate (GZO) and yttria rich zirconia (65YZ, 65 wt % Y2O3 rest zirconia) coatings. The infiltration kinetics, as well as the stability and protective nature of different reaction products, was studied by performing long term infiltration tests (up to 50 h) at 1250 °C. The results reveal that for the specific microstructures used in this study, 65YZ has a higher infiltration resistance and forms a thinner reaction layer compared to GZO. The analysis indicates that the better performance of 65YZ is associated with a synergetic reaction mechanism, which includes the formation of Carich apatite and a uniform layer of a garnet phase. The formation of apatite requires more rare-earth (RE) in the case of GZO than its 65YZ counterpart, meaning that more Gd would be dissolved before forming apatite crystals, which leads to higher consumption of the GZO layer compared to that of 65YZ. The implications of these mechanisms are discussed in detail concerning the tendency of garnet formation, equilibration of the apatite phase with Ca and RE content, and the effects of the reduction in viscosity due to the RE dissolution into the glass. However, microstructural differences in the coatings used in this study might also affect the diverging infiltration resistance and reaction kinetics and need to be considered.
Item URL in elib: | https://elib.dlr.de/191150/ | ||||||||||||||||||||||||||||
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Document Type: | Conference or Workshop Item (Speech) | ||||||||||||||||||||||||||||
Title: | Comparison of the performance of EB-PVD GZO and Yttria rich zirconate coatings against CMAS infiltration | ||||||||||||||||||||||||||||
Authors: |
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Date: | January 2022 | ||||||||||||||||||||||||||||
Refereed publication: | Yes | ||||||||||||||||||||||||||||
Open Access: | No | ||||||||||||||||||||||||||||
Gold Open Access: | No | ||||||||||||||||||||||||||||
In SCOPUS: | No | ||||||||||||||||||||||||||||
In ISI Web of Science: | No | ||||||||||||||||||||||||||||
Status: | Published | ||||||||||||||||||||||||||||
Keywords: | EB-PVD thermal barrier coatings CMAS attack Infiltration kinetics Microstructures Reaction mechanism Phase formation | ||||||||||||||||||||||||||||
Event Title: | ICACC | ||||||||||||||||||||||||||||
Event Location: | Daytona Beach, USA | ||||||||||||||||||||||||||||
Event Type: | international Conference | ||||||||||||||||||||||||||||
Event Dates: | 23-28 January | ||||||||||||||||||||||||||||
Organizer: | American Ceramic Society | ||||||||||||||||||||||||||||
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 Institute of Materials Research > Administrativ-Technische Betriebsleitung / Mikroanalytik und Metallographie | ||||||||||||||||||||||||||||
Deposited By: | Naraparaju, Dr Ravisankar | ||||||||||||||||||||||||||||
Deposited On: | 05 Dec 2022 09:24 | ||||||||||||||||||||||||||||
Last Modified: | 15 Feb 2023 09:04 |
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