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Rare-earth disilicate systems for T/EBC application: Synthesis and high temperature interaction with CMAS

Guijosa-Garcia, Cynthia Y. and Naraparaju, Ravisankar and Mechnich, Peter and Schulz, Uwe (2023) Rare-earth disilicate systems for T/EBC application: Synthesis and high temperature interaction with CMAS. 47th International Conference and Expo on Advanced Ceramics and Composites (ICACC2023), 2023-01-22 - 2023-01-27, Florida, United States.

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Abstract

Thermal and environmental barrier coatings (TEBCs) that are intended to be used on top of ceramic matrix composites (CMCs) require complex properties such as high temperature phase stability, toughness, inertness to water vapor attack, and protection against silica deposit (CMAS) attack. Multi component rare earth disilicates RE2Si2O7 (REDS) such as mixtures of Y, Yb, Er, Ho, Lu, and Sc have been identified as promising TEBC materials due to their high-temperature phase stability, low thermal conductivity, and coefficients of thermal expansion similar to SiC-CMCs (4.5x10-6). A novel synthesis method using high-energy milling and solid-state reaction has been successfully developed for producing multi-component REDS powders rapidly. The current work also focuses on understanding the thermochemical reactions between single-component Y, Yb, Er, Ho, Lu, and Sc disilicates as well as multi-component REDS with different CMAS sources at 1350 and 1400 °C for 1h using REDS+CMAS powder mixtures (), respectively. Results showed the successful synthesis of monoclinic RE disilicatephases (β and γ types). Structural and chemical analysis confirmed the formation of REDS (Yb, Lu, Sc) reprecipitates, reactive crystallization products as apatite (Er), and intrinsic crystallization products such as diopside. Additionally, Y and Ho thermochemical reactions will be discussed.

Item URL in elib:https://elib.dlr.de/193769/
Document Type:Conference or Workshop Item (Speech)
Title:Rare-earth disilicate systems for T/EBC application: Synthesis and high temperature interaction with CMAS
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Guijosa-Garcia, Cynthia Y.UNSPECIFIEDhttps://orcid.org/0000-0001-7784-3768UNSPECIFIED
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:25 January 2023
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:TEBCs, RE-silicates, CMAS, Multi-components
Event Title:47th International Conference and Expo on Advanced Ceramics and Composites (ICACC2023)
Event Location:Florida, United States
Event Type:international Conference
Event Start Date:22 January 2023
Event End Date:27 January 2023
Organizer:The 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
Deposited By: Garcia, Cynthia Yanel Guijosa
Deposited On:03 Feb 2023 08:28
Last Modified:24 Apr 2024 20:54

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