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Influence of the Precursor Cross-Linking Route on the Thermal Stability of Si−B−C−O Ceramics

Ischenko, Vladislav and Pippel, Eckhard and Woltersdorf, Jörg and Yappi, B. Rodrigue Ngoumeni and Hauser, Ralf and Fasel, Claudia and Riedel, Ralf and Poli, Fabrizia and Müller, Klaus (2008):
Influence of the Precursor Cross-Linking Route on the Thermal Stability of Si−B−C−O Ceramics.
In: Chemistry of Materials, pp. 7148-7156, 20, (22), ISSN 0897-4756,
[Online-Edition: http://dx.doi.org/10.1021/cm701916g],
[Article]

Abstract

The specifics of the cross-linking route of tris(1-(dichloro(methyl)silyl)ethyl)borane to form a preceramic polymer suitable for the subsequent synthesis of Si−B−C−O ceramics has significant influence on the local phase composition and the microstructural features of the resulting samples after their ceramization and subsequent annealing. Cross-linking of tris(1-(dichloro(methyl)silyl)ethyl)borane via hydrolysis used for the preceramic polymer synthesis increases the amount of nanocrystalline SiC in the resulting Si−B−C−O ceramics up to 1400 °C, while cross-linking with polyvalent alcohols allows the homogeneous component distribution to be preserved and the formation of crystalline phases to be retarded. The different contents of bound oxygen in the preceramic polymers, depending on the cross-linking route, may explain the observed different stabilities of amorphous Si−B−C−O against phase separation and crystallization.

Item Type: Article
Erschienen: 2008
Creators: Ischenko, Vladislav and Pippel, Eckhard and Woltersdorf, Jörg and Yappi, B. Rodrigue Ngoumeni and Hauser, Ralf and Fasel, Claudia and Riedel, Ralf and Poli, Fabrizia and Müller, Klaus
Title: Influence of the Precursor Cross-Linking Route on the Thermal Stability of Si−B−C−O Ceramics
Language: English
Abstract:

The specifics of the cross-linking route of tris(1-(dichloro(methyl)silyl)ethyl)borane to form a preceramic polymer suitable for the subsequent synthesis of Si−B−C−O ceramics has significant influence on the local phase composition and the microstructural features of the resulting samples after their ceramization and subsequent annealing. Cross-linking of tris(1-(dichloro(methyl)silyl)ethyl)borane via hydrolysis used for the preceramic polymer synthesis increases the amount of nanocrystalline SiC in the resulting Si−B−C−O ceramics up to 1400 °C, while cross-linking with polyvalent alcohols allows the homogeneous component distribution to be preserved and the formation of crystalline phases to be retarded. The different contents of bound oxygen in the preceramic polymers, depending on the cross-linking route, may explain the observed different stabilities of amorphous Si−B−C−O against phase separation and crystallization.

Journal or Publication Title: Chemistry of Materials
Volume: 20
Number: 22
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Dispersive Solids
Date Deposited: 16 Apr 2012 08:32
Official URL: http://dx.doi.org/10.1021/cm701916g
Identification Number: doi:10.1021/cm701916g
Funders: This work was financially supported by the German Science Foundation (DFG, Bonn, Germany) under Grants WO 482/11-2, RI 510/36-2, and MU 1166/12-1, This work was financially supported by the Fonds der Chemischen Industrie, Frankfurt, Germany.
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