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Influence of nano-aluminum filler on the microstructure of SiOC ceramics

Toma, Liviu and Fasel, Claudia and Lauterbach, Stefan and Kleebe, Hans-Joachim and Riedel, Ralf (2011):
Influence of nano-aluminum filler on the microstructure of SiOC ceramics.
In: Journal of the European Ceramic Society, pp. 1779-1789, 31, (9), ISSN 09552219,
[Online-Edition: http://dx.doi.org/10.1016/j.jeurceramsoc.2011.03.011],
[Article]

Abstract

Ceramic SiC–mullite–Al2O3 based nanocomposites were successfully obtained at temperatures below 1500 °C after pyrolysis and annealing of green compacts prepared by cross-linking and shaping in a warm press step of commercial poly(methylsilsesquioxane) MK polymer mechanically mixed with aluminum filler having nanoparticle size. The heat treatment takes place under the exclusion of oxygen (inert argon atmosphere) and temperatures as low as 800 °C initiate the crystallization of a silicon carbide phase. The influence of the nano-aluminum filler and of the pyrolysis temperature on the crystallization behavior of the materials has been investigated. It was confirmed that an appropriate amount of nano-aluminum filler leads to a cristobalite free bulk SiOC ceramic. In consequence, the received ceramic samples have to be considered as a nano/micro-ceramic composite consisting of crystals of mullite (average dimension in the range of 200 nm), silicon carbide (20 nm) and α-alumina (50 nm).

Item Type: Article
Erschienen: 2011
Creators: Toma, Liviu and Fasel, Claudia and Lauterbach, Stefan and Kleebe, Hans-Joachim and Riedel, Ralf
Title: Influence of nano-aluminum filler on the microstructure of SiOC ceramics
Language: English
Abstract:

Ceramic SiC–mullite–Al2O3 based nanocomposites were successfully obtained at temperatures below 1500 °C after pyrolysis and annealing of green compacts prepared by cross-linking and shaping in a warm press step of commercial poly(methylsilsesquioxane) MK polymer mechanically mixed with aluminum filler having nanoparticle size. The heat treatment takes place under the exclusion of oxygen (inert argon atmosphere) and temperatures as low as 800 °C initiate the crystallization of a silicon carbide phase. The influence of the nano-aluminum filler and of the pyrolysis temperature on the crystallization behavior of the materials has been investigated. It was confirmed that an appropriate amount of nano-aluminum filler leads to a cristobalite free bulk SiOC ceramic. In consequence, the received ceramic samples have to be considered as a nano/micro-ceramic composite consisting of crystals of mullite (average dimension in the range of 200 nm), silicon carbide (20 nm) and α-alumina (50 nm).

Journal or Publication Title: Journal of the European Ceramic Society
Volume: 31
Number: 9
Uncontrolled Keywords: Nanocomposites, Mullite, Al2O3, SiC
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 09:24
Official URL: http://dx.doi.org/10.1016/j.jeurceramsoc.2011.03.011
Identification Number: doi:10.1016/j.jeurceramsoc.2011.03.011
Funders: The work reported here is part of the Priority Program “Nanoscaled Inorganic Materials by Molecular Design: New Materials for Advanced Technologies” (DFG-SPP 1181) funded by the Deutsche Forschungsgemeinschaft, Bonn, Germany., Fonds der Chemischen Industrie, Frankfurt, Germany
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