Galusek, D. ; Reschke, S. ; Riedel, R. (1999)
In-situ carbon content adjustment in polymer-derived Si/C/N ceramics by reactive heat treatment. Calculations of the pyrolysis product composition.
In: Silicate industriels, 64 (1-2)
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
A simplified mechanistic approach has been developed to estimate the range of compositional changes during the reactive heat treatment of different preceramic organosilicon precursors resulting in their conversion to amorphous Si/C/N ceramics. The calculations use the compositions of the respective crosslinked polyilazanes as starting values and combine the conversion degrees of chemical reactions with the highest thermodynamical probability taking part during heat treatment. This approach allows to estimate a processing-dependend stoichiometry of the Si/C/N ceramics, assuming the reactions yield thermodynamically stable equilibrium products. Calculated data are consistent with experimental results and indicate, that the stoichiometry of the product is determined by structure and chemical composition of the polymer rather than by the conditions applied during heat treatment. However, within the restrictions through the chemistry of the polymer, the stoichiometry of the productcan be controlled by proper adjustment of the experimental conditions.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 1999 |
| Autor(en): | Galusek, D. ; Reschke, S. ; Riedel, R. |
| Art des Eintrags: | Bibliographie |
| Titel: | In-situ carbon content adjustment in polymer-derived Si/C/N ceramics by reactive heat treatment. Calculations of the pyrolysis product composition |
| Sprache: | Englisch |
| Publikationsjahr: | 1999 |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Silicate industriels |
| Jahrgang/Volume einer Zeitschrift: | 64 |
| (Heft-)Nummer: | 1-2 |
| Kurzbeschreibung (Abstract): | A simplified mechanistic approach has been developed to estimate the range of compositional changes during the reactive heat treatment of different preceramic organosilicon precursors resulting in their conversion to amorphous Si/C/N ceramics. The calculations use the compositions of the respective crosslinked polyilazanes as starting values and combine the conversion degrees of chemical reactions with the highest thermodynamical probability taking part during heat treatment. This approach allows to estimate a processing-dependend stoichiometry of the Si/C/N ceramics, assuming the reactions yield thermodynamically stable equilibrium products. Calculated data are consistent with experimental results and indicate, that the stoichiometry of the product is determined by structure and chemical composition of the polymer rather than by the conditions applied during heat treatment. However, within the restrictions through the chemistry of the polymer, the stoichiometry of the productcan be controlled by proper adjustment of the experimental conditions. |
| Freie Schlagworte: | precursor, polymer pyrolysis, NH3, Si/N(/C), amorphous ceramics, calculations, poly(hydridomethyl)silazanes, polyvinylsilazanes, polymethyldisilazanes |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Disperse Feststoffe |
| Hinterlegungsdatum: | 19 Nov 2008 15:58 |
| Letzte Änderung: | 20 Feb 2020 13:29 |
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