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Carbon-rich SiCN ceramics derived from phenyl-containing poly(silylcarbodiimides)

Mera, Gabriela and Riedel, Ralf and Poli, Fabrizia and Müller, Klaus (2009):
Carbon-rich SiCN ceramics derived from phenyl-containing poly(silylcarbodiimides).
In: Journal of the European Ceramic Society, SciVerse, pp. 2873-2883, 29, (13), ISSN 09552219,
[Online-Edition: http://dx.doi.org/10.1016/j.jeurceramsoc.2009.03.026],
[Article]

Abstract

Novel phenyl-containing polysilylcarbodiimides were synthesized and their thermolysis and crystallization behavior up to 2000 °C was investigated. The Si/C ratio of the preceramic polymer was varied in a defined way by starting from dichlorosilanes with different organic substituents, namely R and R′ with R = phenyl and R′ = H, phenyl, methyl or vinyl. Several techniques were employed to study the structural features of the polymers and their thermolysis products. The temperature of crystallization depends on the carbon content of the precursors. Thus, in the sample with the highest carbon content the separation of β-SiC from the amorphous SiCN matrix is observed at T > 1500 °C, resulting in the highest temperature of thermal stability against crystallization ever reported for a SiCN ceramic derived from polysilylcarbodiimides. Moreover, no crystallization of β-Si3N4 was observed.

Item Type: Article
Erschienen: 2009
Creators: Mera, Gabriela and Riedel, Ralf and Poli, Fabrizia and Müller, Klaus
Title: Carbon-rich SiCN ceramics derived from phenyl-containing poly(silylcarbodiimides)
Language: English
Abstract:

Novel phenyl-containing polysilylcarbodiimides were synthesized and their thermolysis and crystallization behavior up to 2000 °C was investigated. The Si/C ratio of the preceramic polymer was varied in a defined way by starting from dichlorosilanes with different organic substituents, namely R and R′ with R = phenyl and R′ = H, phenyl, methyl or vinyl. Several techniques were employed to study the structural features of the polymers and their thermolysis products. The temperature of crystallization depends on the carbon content of the precursors. Thus, in the sample with the highest carbon content the separation of β-SiC from the amorphous SiCN matrix is observed at T > 1500 °C, resulting in the highest temperature of thermal stability against crystallization ever reported for a SiCN ceramic derived from polysilylcarbodiimides. Moreover, no crystallization of β-Si3N4 was observed.

Journal or Publication Title: Journal of the European Ceramic Society
Volume: 29
Number: 13
Publisher: SciVerse
Uncontrolled Keywords: Precursors-organic, Spectroscopy, Thermal properties, Carbon, C-rich SiCN ceramics
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: 12 Apr 2012 11:26
Official URL: http://dx.doi.org/10.1016/j.jeurceramsoc.2009.03.026
Identification Number: doi:10.1016/j.jeurceramsoc.2009.03.026
Funders: The authors acknowledge the Deutsche Forschungsgemeinschaft, Bonn, Germany (DFG-NSF research initiative) for their financial support., The authors acknowledge the Fonds der Chemischen Industrie, Frankfurt (Germany) for their financial support.
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