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Relation between interphase porosity and crack deflection tendency in all-oxide Ceramic Matrix Composites

Richter, Henning (2015) Relation between interphase porosity and crack deflection tendency in all-oxide Ceramic Matrix Composites. 90. DKG Jahrestagung & Symposium Hochleistungskeramik 2015, 15.–19. März 2015, Bayreuth.

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Abstract

The concept of Ceramic Matrix Composites (CMC) is aimed at overcoming the brittleness of conventional monolithic ceramics while retaining their favourable properties, such as high-temperature stability and thermal shock resistance. This concept is based on a sufficiently weak bonding between the ceramic fibres and the ceramic matrices, which is realized either by applying fibre coatings or by using low-strength, highly porous matrix interphases. Both approaches assure fibre-matrix de-bonding under mechanical loading, which is required to use the comparatively high failure strain of the fibres and to enable an overall damage tolerant behaviour of CMCs. During the service life of CMC components, however, the fibre-matrix interface or interphase is subject to changes: Due to exposure to high application temperatures, sintering processes re-initiate, leading to morphological alterations in the CMC microstructure, which ultimately affect the CMCs damage tolerance. For an all-oxide CMC with porous fibre-matrix interphase, the effect of varying interphase porosity on the expectable damage tolerance has been studied. The relation between interphase porosity and the tendency of a matrix crack to deviate in the vicinity of an embedded fibre was described by a simple analytical equation. The interphase properties required for solving this equation were predicted using microstructure-based numerical models. Experimental investigations were carried out to evaluate the analytical approach.

Item URL in elib:https://elib.dlr.de/96800/
Document Type:Conference or Workshop Item (Speech)
Title:Relation between interphase porosity and crack deflection tendency in all-oxide Ceramic Matrix Composites
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Richter, Henninghenning.richter (at) dlr.deUNSPECIFIED
Date:17 March 2015
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Ceramic Matrix Composite, interphase, crack deflection
Event Title:90. DKG Jahrestagung & Symposium Hochleistungskeramik 2015
Event Location:Bayreuth
Event Type:international Conference
Event Dates:15.–19. März 2015
Organizer:Deutsche Keramische Gesellschaft e. V.
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:propulsion systems
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Virtual Engine and Validation methods
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Experimental and Numerical Methods
Deposited By: Richter, Henning
Deposited On:06 Jul 2015 09:16
Last Modified:06 Jul 2015 09:16

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