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Al2O3–SiC composites prepared by infiltration of pre-sintered alumina with a poly(allyl)carbosilane

Galusek, Dušan and Klement, Róbert and Sedláček, Jaroslav and Balog, Miroslav and Fasel, Claudia and Zhang, J. and Crimp, M. A. and Riedel, Ralf (2011):
Al2O3–SiC composites prepared by infiltration of pre-sintered alumina with a poly(allyl)carbosilane.
In: Journal of the European Ceramic Society, pp. 111-119, 31, (1-2), ISSN 09552219,
[Online-Edition: http://dx.doi.org/10.1016/j.jeurceramsoc.2010.09.013],
[Article]

Abstract

The Al2O3/SiC nanocomposites containing 3–8 vol.% SiC were prepared through infiltration and in situ thermal decomposition of a preceramic polymer SiC precursor (poly(allyl)carbosilane) in pre-sintered alumina matrix. The volume fraction of SiC, and the microstructure of composites were adjusted by concentration of the polymer solution, and by the conditions of pyrolysis and sintering. The specimens were densified by pressureless sintering at temperatures between 1550 and 1850 °C in flowing argon. The use of powder bed producing SiO, CO and other volatile species suppressed decomposition reactions in the composites and was vital for their successful densification. The experimental results are discussed against thermodynamic analysis of the system Al2O3/SiC/SiO2 in an inert Ar atmosphere.

Item Type: Article
Erschienen: 2011
Creators: Galusek, Dušan and Klement, Róbert and Sedláček, Jaroslav and Balog, Miroslav and Fasel, Claudia and Zhang, J. and Crimp, M. A. and Riedel, Ralf
Title: Al2O3–SiC composites prepared by infiltration of pre-sintered alumina with a poly(allyl)carbosilane
Language: English
Abstract:

The Al2O3/SiC nanocomposites containing 3–8 vol.% SiC were prepared through infiltration and in situ thermal decomposition of a preceramic polymer SiC precursor (poly(allyl)carbosilane) in pre-sintered alumina matrix. The volume fraction of SiC, and the microstructure of composites were adjusted by concentration of the polymer solution, and by the conditions of pyrolysis and sintering. The specimens were densified by pressureless sintering at temperatures between 1550 and 1850 °C in flowing argon. The use of powder bed producing SiO, CO and other volatile species suppressed decomposition reactions in the composites and was vital for their successful densification. The experimental results are discussed against thermodynamic analysis of the system Al2O3/SiC/SiO2 in an inert Ar atmosphere.

Journal or Publication Title: Journal of the European Ceramic Society
Volume: 31
Number: 1-2
Uncontrolled Keywords: Nanocomposites, Al2O3, SiC, SiO2, Sintering
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Dispersive Solids
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 04 Apr 2012 11:30
Official URL: http://dx.doi.org/10.1016/j.jeurceramsoc.2010.09.013
Identification Number: doi:10.1016/j.jeurceramsoc.2010.09.013
Funders: The financial support of this work by the Alexander von Humboldt Foundation, Bonn, Germany (D. Galusek and R. Riedel), by the APVV grant No 0485-06, by the grant APVV LPP 0297-09, J. Fulbright Commission in the Slovak Republic (M. Balog)
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