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  4. Isothermal oxidation behaviour of a polymer-derived amorphous SI/C/N ceramic
 
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2007
Conference Paper
Titel

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

Abstract
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.
Author(s)
Reschke, S.
Fraunhofer-Institut für Naturwissenschaftlich-Technische Trendanalysen INT
Galusek, D.
Vitrum Laugaricio Joint Glass Centre, Trencin, Slowakei
Hauptwerk
12th International Conference on Problems of Material Engineering, Mechanics and Design 2007. CD-ROM
Konferenz
International Conference on Problems of Material Engineering, Mechanics and Design 2007
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Fraunhofer-Institut für Naturwissenschaftlich-Technische Trendanalysen INT
Tags
  • polymer-derived ceram...

  • Oxidation

  • amorphous ceramics

  • non-oxide ceramics

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