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Isothermal oxidation behaviour of a polymer-derived amorphous SI/C/N ceramic

: Reschke, S.; Galusek, D.

Univ. Trencin, Falkultät für industrielle Technologien:
12th International Conference on Problems of Material Engineering, Mechanics and Design 2007. CD-ROM
Puchov, Slowakei, 2007
ISBN: 978-80-969728-0-7
3 S.
International Conference on Problems of Material Engineering, Mechanics and Design <12, 2007, Jasna>
Fraunhofer INT ()
polymer-derived ceramic; Oxidation; amorphous ceramics; non-oxide ceramics

Polymer-derived non-oxide ceramics are candidate materials for various applications especially in the high-temperature regime above 1200°C, where conventionally liquid-phase sintered ceramics start to fail due to softening of their glassy grain boundary phase. The polymer-to-ceramic approach uses high-purity educts from polymer chemistry. It allows for an additive-free synthesis of ceramic materials and thus avoids the presence of glassy grain boundary phases in the body. In this work, the oxidation behaviour of poly(hydridomethyl)silazane NCP200-derived ceramic materials is investigated in more detail. Therefore, after standardised crosslinking and ceramisation the amorphous ceramic material was milled and sieved to a powder fraction with r ? 32µm. These powders with high surface-to-volume ratio were isothermally oxidised for 20 h using a TGA at temperatures between 1000°C and 1500°C in steps of 100K, each a sample of approx. 120mg in an alumina crucible. Preliminary results on the oxidation behaviour of the specimens are reported and the mechanisms of oxidation are outlined.