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Long fibre reinforced ceramics with active fillers and a modified intra-matrix bond based on the LPI process

Stantschev, G. and Frieß, M. and Kochendörfer, R. and Krenkel, W. (2004) Long fibre reinforced ceramics with active fillers and a modified intra-matrix bond based on the LPI process. Journal of the European Ceramic Society (Elsevier), 25, pp. 205-209.

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Abstract

Silicon-based preceramic polymers are attractive candidates for the manufacture of high temperature and corrosion resistant ceramics, particularly in regard to the formation of a ceramic matrix in long fibre reinforced ceramic matrix composites (CMCs). The manufacture of CMCs constitutes of the infiltration of fibre preforms followed by a subsequent crosslinking and pyrolysis of the Si-precursor, yielding an amorphous ceramic matrix. However, due to the inherent shrinkage of ceramic precursors, a high number of polymer impregnation and pyrolysis (PIP) cycles is required to obtain dense composites. Nevertheless, their microstructure is characterized by large interbundle pores which show a negative impact on the mechanical properties. In order to improve the performance of the long fibre reinforced CMCs as well as to accelerate the manufacturing process, a novel approach was investigated. Thereby, micro-sized powders of Al and Ti are used as active fillers. The powders were strewed between the fabric plies and infiltrated by the resin transfer moulding (RTM) technique. Since reactions with the polymer matrix are associated with a volume increase during pyrolysis, a more dense ceramic matrix is obtained. The processing of the CMCs employs the commercial polysilazanes CERASET SN and VL20 as preceramic precursors. The reinforcement constitutes of Tyranno SA fibres. To densify the composites, up to five PIP cycles were performed. CMC samples were aged in air to evaluate the impact of oxidation on microstructure and mechanical properties. Microstructural characterization was conducted using both optical and electron microscopy. The conversion of the filler particles was analysed by means of EDX and XRD.

Document Type:Article
Additional Information: LIDO-Berichtsjahr=2005,
Title:Long fibre reinforced ceramics with active fillers and a modified intra-matrix bond based on the LPI process
Authors:
AuthorsInstitution or Email of Authors
Stantschev, G.UNSPECIFIED
Frieß, M.UNSPECIFIED
Kochendörfer, R.UNSPECIFIED
Krenkel, W.Universität Bayreuth
Date:2004
Journal or Publication Title:Journal of the European Ceramic Society (Elsevier)
Refereed publication:Yes
In ISI Web of Science:Yes
Volume:25
Page Range:pp. 205-209
Status:Published
Keywords:CMC, composites, ceramic, long fibre, fillers, interface, liquid polymer infiltration, LPI
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W RP - Raumtransport
DLR - Research area:Space
DLR - Program:W RP - Raumtransport
DLR - Research theme (Project):UNSPECIFIED
Location: Stuttgart
Institutes and Institutions:Institute of Structures and Design
Deposited By: elib DLR-Beauftragter
Deposited On:16 Sep 2005
Last Modified:14 Jan 2010 13:28

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