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

Stantschev, G. und Frieß, M. und Kochendörfer, R. und 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, Seiten 205-209.

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Kurzfassung

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.

Dokumentart:Zeitschriftenbeitrag
Zusätzliche Informationen: LIDO-Berichtsjahr=2005,
Titel:Long fibre reinforced ceramics with active fillers and a modified intra-matrix bond based on the LPI process
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Stantschev, G.NICHT SPEZIFIZIERT
Frieß, M.NICHT SPEZIFIZIERT
Kochendörfer, R.NICHT SPEZIFIZIERT
Krenkel, W.Universität Bayreuth
Datum:2004
Erschienen in:Journal of the European Ceramic Society (Elsevier)
Referierte Publikation:Ja
In ISI Web of Science:Ja
Band:25
Seitenbereich:Seiten 205-209
Status:veröffentlicht
Stichwörter:CMC, composites, ceramic, long fibre, fillers, interface, liquid polymer infiltration, LPI
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Weltraum (alt)
HGF - Programmthema:W RP - Raumtransport
DLR - Schwerpunkt:Weltraum
DLR - Forschungsgebiet:W RP - Raumtransport
DLR - Teilgebiet (Projekt, Vorhaben):NICHT SPEZIFIZIERT
Standort: Stuttgart
Institute & Einrichtungen:Institut für Bauweisen- und Konstruktionsforschung
Hinterlegt von: elib DLR-Beauftragter
Hinterlegt am:16 Sep 2005
Letzte Änderung:14 Jan 2010 13:28

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