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Interphase Challenges in Dense Oxide and Non-oxide CMCs for Long Term Applications

Frieß, Martin and Klatt, Enrico and Mainzer, Bernd and Hönig, Sandrine and Koch, Dietmar (2013) Interphase Challenges in Dense Oxide and Non-oxide CMCs for Long Term Applications. HTCMC8, 23--27.9.2013, Xian, China.

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Abstract

Under long-term HT-loading conditions, highly porous all oxide fibre based CMCs as well as porous non-oxide CMCs suffer from enhanced chemical attack due to high surface area and due to microstructural degradation depending on phase composition. Additionally, fibre/matrix interaction may change due to internal oxidation resulting in brittle fracture behavior. Dense CMCs in combination with an integrated oxidation and environmental protection system have a real chance to overcome these problems. Furthermore a suitable weak fiber matrix interface must be provided which will be reliable for sufficient time in case of protection system failure. LaPO4 is a prime candidate for this challenge due to inherent oxidation stability, high thermal resistance and chemical inertness to oxide as well as non-oxide CMCs based on SiC. At DLR fundamental research based on commercial fabrics of alumina silicate, alumina as well as SiC type was performed. Coatings applied by Foulard technique as well as dip-coating were investigated and evaluated according to effectiveness and performance of coating. First results of mechanical as well as microstructural properties considering roughness of the fibres will be addressed before and after annealing at high temperature. Furthermore, a perspective of new fibre coatings suitable for the development of dense SiC/SiC materials via LPI processing will be given.

Item URL in elib:https://elib.dlr.de/87471/
Document Type:Conference or Workshop Item (Speech)
Title:Interphase Challenges in Dense Oxide and Non-oxide CMCs for Long Term Applications
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Frieß, Martinmartin.friess (at) dlr.deUNSPECIFIED
Klatt, Enricoenrico.klatt (at) dlr.deUNSPECIFIED
Mainzer, Berndbernd.mainzer (at) dlr.deUNSPECIFIED
Hönig, Sandrinesandrine.hoenig (at) dlr.deUNSPECIFIED
Koch, Dietmardietmar.koch (at) dlr.deUNSPECIFIED
Date:23 September 2013
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:CMC, interface, fibre coating, lanthanum phosphate
Event Title:HTCMC8
Event Location:Xian, China
Event Type:international Conference
Event Dates:23--27.9.2013
Organizer:HTCMC
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research (old)
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Military Technologies (old)
Location: Stuttgart
Institutes and Institutions:Institute of Structures and Design > Ceramic Composite Structures
Deposited By: Friess, Dr.rer.nat. Martin
Deposited On:14 Jan 2014 09:10
Last Modified:08 May 2014 23:20

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