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Development of a SiNx-based barrier coating for SiC fibres

Roder, Kristina and Nestler, Daisy and Wett, Daniel and Mainzer, Bernd and Frieß, Martin and Wöckel, Lydia and Ebert, Thomas and Wagner, Guntram and Koch, Dietmar and Spange, Stefan (2015) Development of a SiNx-based barrier coating for SiC fibres. In: Materials Science Forum, 825, pp. 256-263. Trans Tech Publications. 20. Symposium Verbundwerkstoffe und Werkstoffverbunde, 1.-3. Juli 2015, Wien/ Österreich.

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Abstract

Uncoated SiC fibres in SiC/SiC composites manufactured by the liquid-silicon infiltration (LSI) process show a strong degradation as a result of silicon attack. The goal of this research is the development of a SiNx-based fibre coating, which acts as a barrier against the liquid silicon. The coating is applied by means of low-pressure chemical vapour deposition (LPCVD) utilising the gaseous precursors silane (SiH4) and ammonia (NH3) on a commercial SiC multifilament yarn. The result is an amorphous fibre coating with an increasing coating thickness and a variable chemical composition from the middle of the yarn to the edges. The coated fibres exhibit a reduced characteristic Weibull strength in comparison to the uncoated fibres. In order to examine the stability of the films, the coated fibres undergo a heat treatment at 1450 °C in different environments (vacuum, argon and nitrogen). In all environments, the amorphous SiNx coatings crystallise to the trigonal Si3N4. Depending on the coating thickness cracks and defects develop. However, the best results and the lowest amount of damaging occurs during the treatment in nitrogen.

Item URL in elib:https://elib.dlr.de/102608/
Document Type:Conference or Workshop Item (Speech)
Title:Development of a SiNx-based barrier coating for SiC fibres
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Roder, Kristinakristina.roder (at) mb.tu-chemnitz.deUNSPECIFIED
Nestler, Daisydaisy.nestler (at) mb.tu-chemnitz.deUNSPECIFIED
Wett, Danieldaniel.wett (at) mb.tu-chemnitz.deUNSPECIFIED
Mainzer, Berndbernd.mainzer (at) dlr.deUNSPECIFIED
Frieß, Martinmartin.friess (at) dlr.deUNSPECIFIED
Wöckel, Lydialydia.woeckel (at) chemie.tu-chemnitz.deUNSPECIFIED
Ebert, Thomasthomas.ebert (at) chemie.tu-chemnitz.deUNSPECIFIED
Wagner, Guntramguntram.wagner (at) mb.tu-chemnitz.deUNSPECIFIED
Koch, Dietmardietmar.koch (at) dlr.deUNSPECIFIED
Spange, Stefanstefan.spange (at) chemie.tu-chemnitz.deUNSPECIFIED
Date:2015
Journal or Publication Title:Materials Science Forum
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:Yes
Volume:825
Page Range:pp. 256-263
Editors:
EditorsEmail
Edtmaier, Christianchristian.edtmaier@tuwien.ac.at
Requena, Guillermoguillermo.requena@tuwien.ac.at
Publisher:Trans Tech Publications
Status:Published
Keywords:LPCVD, fibre coating, SiNx, SiC/SiC composite, LSI process
Event Title:20. Symposium Verbundwerkstoffe und Werkstoffverbunde
Event Location:Wien/ Österreich
Event Type:international Conference
Event Dates:1.-3. Juli 2015
Organizer:Deutsche Gesellschaft für Materialkunde
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: Stuttgart
Institutes and Institutions:Institute of Structures and Design > Ceramic Composite Structures
Deposited By: Mainzer, Bernd
Deposited On:28 Jan 2016 12:43
Last Modified:09 Feb 2017 19:22

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