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Single and multi-component REDS systems for TEBC application: Synthesis and study of high temperature interaction with CMAS

Guijosa-Garcia, Cynthia Y. and Mechnich, Peter and Schulz, Uwe and Naraparaju, Ravisankar (2023) Single and multi-component REDS systems for TEBC application: Synthesis and study of high temperature interaction with CMAS. The XVIIIth Conference of the European Ceramic Society, 2023-07-02 - 2023-07-06, Lyon, France.

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Multi-component rare earth disilicates RE2Si2O7 (REDS) are considered as promising materials to be used as thermal environmental barrier coatings (TEBCs) to protect ceramic matrix composites (CMCs) against environmental degradation. The combination of multiple cations in a single phase is expected to decrease the overall thermal conductivity of the material. In addition, they can also increase the phase stability at high temperatures, toughness, inertness to water vapor attack, and stability against molten deposits (CMAS) attack. In this work, single and multi-component rare earth disilicates have been successfully synthesized using a novel and quick synthesis method through solid-state reaction. The main goal of this study is to understand the thermochemical interactions of single cation (Y, Yb, Er, Ho, Lu, and Sc) disilicates and multiple cation disilicates e.g. (Y,Yb)2Si2O7, (Y,Yb,Er)2Si2O7, (Y,Yb,Er,Ho)2Si2O7 with CMAS at 1350 and 1400°C for 1h. Results have shown that the synthesized powders exhibit formation of a single monoclinic phase (β or γ types) both in single and multi-component disilicate systems. The CMAS interaction resulted in formation of REDS reprecipitates (Yb, Lu, Sc), apatite (Er, Ho, Y), and diopside (Sc) as reactive crystallization products. Finally, the multiple cation effect on the formation of the reaction products will be discussed.

Item URL in elib:https://elib.dlr.de/195952/
Document Type:Conference or Workshop Item (Speech)
Title:Single and multi-component REDS systems for TEBC application: Synthesis and study of high temperature interaction with CMAS
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Guijosa-Garcia, Cynthia Y.UNSPECIFIEDhttps://orcid.org/0000-0001-7784-3768UNSPECIFIED
Mechnich, PeterUNSPECIFIEDhttps://orcid.org/0000-0003-4689-8197146019632
Schulz, UweUNSPECIFIEDhttps://orcid.org/0000-0003-0362-8103UNSPECIFIED
Naraparaju, RavisankarUNSPECIFIEDhttps://orcid.org/0000-0002-3944-1132UNSPECIFIED
Date:4 July 2023
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:Disilicates, Synthesis, CMAS, Multi-component, TEBC
Event Title:The XVIIIth Conference of the European Ceramic Society
Event Location:Lyon, France
Event Type:international Conference
Event Start Date:2 July 2023
Event End Date:6 July 2023
Organizer:European Ceramic Society, ECerS
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: Garcia, Cynthia Yanel Guijosa
Deposited On:06 Nov 2023 09:12
Last Modified:24 Apr 2024 20:56

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