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Protective Coatings for Enhanced Performance of Oxide-Oxide Composites

Mechnich, Peter and Alkan, Gözde and Flucht, Ferdinand (2023) Protective Coatings for Enhanced Performance of Oxide-Oxide Composites. 11th International Conference on High-Temperature Ceramic Matrix Composites, 2023-08-27 - 2023-08-31, Jeju, Korea.

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Abstract

Ceramic matrix composites based on oxide fibers and porous oxide matrices are materials developed for various applications in harsh environments. State-of-the art oxide/oxide CMC are based on alumina or mullite fibers and porous alumina matrices. Thermal-chemical degradation of the fibers and matrices is associated with sintering/grain growth, surface reactions with mineral dusts or molten salts, and hydroxylation/volatilization of Si- or Al-hydroxide species. All mechanisms are typically relevant for applications in combustion atmospheres. Moreover, the relatively low mechanical stability of the porous oxide matrices makes CMC surfaces prone to surface degradation by abrasion. Degradation of CMC can effectively be mitigated by functional and protective oxide coatings which can be deposited e.g. by thermal spraying or in the form of particle dispersions and subsequent consolidation by sintering. Thermal protection as well as improved chemical stability are provided by low-thermal conductivity and environmentally stable coating materials. Additional benefits of ceramic coatings can be improved mechanical stability, reduced gas permeability, or thermo-optical properties for enhanced performance of all-oxide CMC in special applications. On the other hand, typical coating deposition processes are associated with additional thermal loads or surface effects which may significantly alter properties of the CMC substrate. Various types of oxide coatings for oxide/oxide CMC and their specific functionalities are presented. The impact of coatings on the overall performance of coated CMC materials is discussed.

Item URL in elib:https://elib.dlr.de/201672/
Document Type:Conference or Workshop Item (Speech)
Title:Protective Coatings for Enhanced Performance of Oxide-Oxide Composites
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Mechnich, PeterUNSPECIFIEDhttps://orcid.org/0000-0003-4689-8197150708194
Alkan, GözdeUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Flucht, FerdinandUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Date:31 August 2023
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Oxide, CMC, coatings
Event Title:11th International Conference on High-Temperature Ceramic Matrix Composites
Event Location:Jeju, Korea
Event Type:international Conference
Event Start Date:27 August 2023
Event End Date:31 August 2023
Organizer:The Korean 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 > Structural and Functional ceramics
Deposited By: Mechnich, Dr.rer.nat. Peter
Deposited On:15 Jan 2024 09:53
Last Modified:24 Apr 2024 21:02

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