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Journal of Ceramic Science and Technology

The Journal of Ceramic Science and Technology publishes original scientific articles on all topics of ceramic science and technology from all ceramic branches. The focus is on the scientific exploration of  the relationships between processing, microstructure and properties of sintered ceramic materials as well as on new processing routes for innovative ceramic materials. The papers may have either theoretical or experimental background. A high quality of publications will be guaranteed by a thorough double blind peer review process.

The Journal is published by Göller Verlag GmbH on behalf of the Deutsche Keramische Gesellschaft (DKG). Edited by Yu-Ping Zeng, Shanghai Institute of Ceramics, Chinese Academy of Sciences, China.

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New Si/B/N/C Ceramics from a Silaborazine-Type Single-Source Precursor

H. Cakmak, M. Jansen

Max Planck Institute for Solid State Research, Heisenbergstrasse 1, 70569 Stuttgart, Germany

received November 25, 2010, , accepted December 2, 2010

Vol. 2, No. 1, Pages 23-30   DOI: 10.4416/JCST2010-00044

Abstract

A new chloro-substituted monocyclic silaborazine derivative with a B/Si-ratio of 2, namely 1,1,3,5-tetrachloro-2,6-dimethyl-4-hydride-1-silaborazine (TDSB), has served as a single-source precursor for the synthesis of amorphous Si/B/N/C ceramics via the well-known „polymer route”. Accordingly, ammonia and methylamine were used as cross-linking reagents for polymerization of TDSB, leading to highly homogeneous pre-ceramic polymers, which were characterized with spectroscopic methods. In addition, subsequent thermal degradation of as-obtained polyborocarbosilazanes was monitored by means of DTA/TG/MS up to 1350 °C. The resulting amorphous ceramics exhibit excellent thermal durability up to 2000 °C under inert conditions. This is attributed to silaborazine rings (originating from the TDSB precursor molecule) still being present in the covalent Si/B/N/C network and reinforcing the final ceramics on atomic scale by acting as rigid structural units.

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Keywords

Silaborazine, single-source precursor, pre-ceramic polymer, precursor-derived ceramic, Si/B/N/C ceramics

References

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14 Wilfert, J., Meier, K., Hahn, K., Grin, Y., Jansen, M.: SiC/BN composites by spark plasma sintering (SPS) of precursor-derived SiBNC powders, J. Ceram. Sci. Tech., 1, 1-6, (2010).

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Copyright

© 2010 Göller Verlag

Acknowledgments

The authors are grateful to M.-L. Schreiber for supporting preparative and analytical work, and to J. Wilfert and T. Pilz for DTA/TG/MS measurements.

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