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Environmental Barrier Coatings for SiC/SiC-CMCs - Manufacture and Behaviour Under Cyclic Oxidation and Flowing Water Vapour

Leisner, Vito and Schulz, Uwe (2016) Environmental Barrier Coatings for SiC/SiC-CMCs - Manufacture and Behaviour Under Cyclic Oxidation and Flowing Water Vapour. 9th International Conference on High Temperature Ceramic Matrix Composites, 26. Juni - 01. Juli 2016, Toronto, Kanada.

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Abstract

Silicon carbide ceramic matrix composites (SiC/SiC-CMCs) are promising materials for application in the hot section of gas turbines. SiC forms a protective SiO2 scale (TGO) which sufficiently protects the underlying material from oxidation at high temperatures in dry air. However, if rapidly flowing water vapour in a combustion environment is present, the TGO is subjected to severe volatilization by formation of silicon hydroxide. Thus, an environmental barrier coating (EBC) system is required which needs to have thermochemically compatible interfaces and a coefficient of thermal expansion (CTE) matching the SiC/SiC-CMC. In this study, CMCs were coated by magnetron sputtering and EB-PVD with silicon-based bond coats, Y2Si2O7, and Y2SiO5 or combinations thereof. The coating architecture was designed namely to minimize chemical interactions among different layers and with a strain tolerant micro structure. The samples were cyclically tested up to 1250°C in air with and without thermal gradient, respectively. Their degradation behaviour in flowing water vapour was additionally investigated. Emphasis was put on both interfacial chemical reactions, and phase evolution. While the uncoated SiC/SiC-CMC suffered from severe degradation under water vapour, the EBC system proved to be stable and provides good protection of the SiC/SiC-CMC.

Item URL in elib:https://elib.dlr.de/108165/
Document Type:Conference or Workshop Item (Speech)
Title:Environmental Barrier Coatings for SiC/SiC-CMCs - Manufacture and Behaviour Under Cyclic Oxidation and Flowing Water Vapour
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Leisner, VitoVito.Leisner (at) dlr.deUNSPECIFIED
Schulz, UweUwe.Schulz (at) dlr.deUNSPECIFIED
Date:June 2016
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:EBC, SiC, CMC, Yttriumsilicate, Silicon, PVD, Water vapour
Event Title:9th International Conference on High Temperature Ceramic Matrix Composites
Event Location:Toronto, Kanada
Event Type:international Conference
Event Dates:26. Juni - 01. Juli 2016
Organizer:American Ceramic Society
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Structures and Materials
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > High Temperature and Functional Coatings
Deposited By: Leisner, Vito
Deposited On:24 Nov 2016 08:22
Last Modified:24 Nov 2016 08:22

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