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SiC/SiC(N) Composites: Manufacture and potential UHT Applications

Frieß, Martin and Mainzer, Bernd and Klatt, Enrico and Koch, Dietmar (2014) SiC/SiC(N) Composites: Manufacture and potential UHT Applications. Review of the NHSC Program and Future of High Temperature Structural Ceramics, 28.-31.Jul.2014, Boulder, Colorado, US.

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Abstract

State-of-the-art, highly porous oxide based CMCs with intrinsic oxidation stability and no need to fibre coating, suffer from enhanced chemical attack due to high surface areas as well as from grain coarsening and strength reduction under UHT loading conditions. Dense oxide/oxide and especially non-oxide CMCs in combination with integrated oxidation and environmental protection systems have a real chance to overcome this problem, due to much lower attack surface area. Therefore, it is, of inevitable necessity to provide a suitable weak fibre/matrix bonding by fibre coating for both, oxide/oxide and non-oxide/non-oxide CMCs, which will be reliable for a limited time, in case of protection system failure. For PIP-processing, lanthanum phosphate is a prime candidate for this challenge due to inherent oxidation stability, high thermal resistance (m.p. 2058 °C) and chemical inertness to oxide as well as some non-oxide materials based on silicon carbide based materials. At DLR fundamental research based on commercial fabrics of alumina type (Nextel 610) as well as silicon carbide type (Tyranno Type SA3) was performed. According to effectiveness and performance of coating (number of cycles) fibre coatings applied by Foulard technique were further developed and evaluated. It turned out that an important factor is the surface roughness of the fibre. In addition, first results of mechanical properties before and after annealing at high temperature will be addressed. Moreover first results on plasma torch tests will be presented. In case of LSI-processing, providing pretty dense CMCs in one cycle, however, requiring severe processing conditions (>1410°C, Si-vapour conditions) new fibre coatings are under development in basic research programs and assessed to typical test conditions.

Item URL in elib:https://elib.dlr.de/91106/
Document Type:Conference or Workshop Item (Speech)
Title:SiC/SiC(N) Composites: Manufacture and potential UHT Applications
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Frieß, Martinmartin.friess (at) dlr.deUNSPECIFIED
Mainzer, Berndbernd.mainzer (at) dlr.deUNSPECIFIED
Klatt, Enricoenrico.klatt (at) dlr.deUNSPECIFIED
Koch, Dietmardietmar.koch (at) dlr.deUNSPECIFIED
Date:28 July 2014
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:SiC/SiC, CMC, interface, PIP
Event Title:Review of the NHSC Program and Future of High Temperature Structural Ceramics
Event Location:Boulder, Colorado, US
Event Type:Workshop
Event Dates:28.-31.Jul.2014
Organizer:University of Boulder
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 - Military Technologies
Location: Stuttgart
Institutes and Institutions:Institute of Structures and Design > Ceramic Composite Structures
Deposited By: Friess, Dr.rer.nat. Martin
Deposited On:23 Dec 2014 17:37
Last Modified:23 Dec 2014 17:37

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