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

H. Cakmak, M. Jansen

Journal of Ceramic Science and Technology, Vol. 2, No. 1 (2011), pp. 23-30

DOI: 10.4416/JCST2010-00044

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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.

Keywords

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

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