Mera, Gabriela ; Riedel, Ralf ; Poli, Fabrizia ; Müller, Klaus (2009)
Carbon-rich SiCN ceramics derived from phenyl-containing poly(silylcarbodiimides).
In: Journal of the European Ceramic Society, 29 (13)
doi: 10.1016/j.jeurceramsoc.2009.03.026
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
Novel phenyl-containing polysilylcarbodiimides were synthesized and their thermolysis and crystallization behavior up to 2000 °C was investigated. The Si/C ratio of the preceramic polymer was varied in a defined way by starting from dichlorosilanes with different organic substituents, namely R and R′ with R = phenyl and R′ = H, phenyl, methyl or vinyl. Several techniques were employed to study the structural features of the polymers and their thermolysis products. The temperature of crystallization depends on the carbon content of the precursors. Thus, in the sample with the highest carbon content the separation of β-SiC from the amorphous SiCN matrix is observed at T > 1500 °C, resulting in the highest temperature of thermal stability against crystallization ever reported for a SiCN ceramic derived from polysilylcarbodiimides. Moreover, no crystallization of β-Si3N4 was observed.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2009 |
| Autor(en): | Mera, Gabriela ; Riedel, Ralf ; Poli, Fabrizia ; Müller, Klaus |
| Art des Eintrags: | Bibliographie |
| Titel: | Carbon-rich SiCN ceramics derived from phenyl-containing poly(silylcarbodiimides) |
| Sprache: | Englisch |
| Publikationsjahr: | Oktober 2009 |
| Verlag: | SciVerse |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Journal of the European Ceramic Society |
| Jahrgang/Volume einer Zeitschrift: | 29 |
| (Heft-)Nummer: | 13 |
| DOI: | 10.1016/j.jeurceramsoc.2009.03.026 |
| Kurzbeschreibung (Abstract): | Novel phenyl-containing polysilylcarbodiimides were synthesized and their thermolysis and crystallization behavior up to 2000 °C was investigated. The Si/C ratio of the preceramic polymer was varied in a defined way by starting from dichlorosilanes with different organic substituents, namely R and R′ with R = phenyl and R′ = H, phenyl, methyl or vinyl. Several techniques were employed to study the structural features of the polymers and their thermolysis products. The temperature of crystallization depends on the carbon content of the precursors. Thus, in the sample with the highest carbon content the separation of β-SiC from the amorphous SiCN matrix is observed at T > 1500 °C, resulting in the highest temperature of thermal stability against crystallization ever reported for a SiCN ceramic derived from polysilylcarbodiimides. Moreover, no crystallization of β-Si3N4 was observed. |
| Freie Schlagworte: | Precursors-organic, Spectroscopy, Thermal properties, Carbon, C-rich SiCN ceramics |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Disperse Feststoffe 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften |
| Hinterlegungsdatum: | 12 Apr 2012 11:26 |
| Letzte Änderung: | 05 Mär 2013 10:00 |
| PPN: | |
| Sponsoren: | The authors acknowledge the Deutsche Forschungsgemeinschaft, Bonn, Germany (DFG-NSF research initiative) for their financial support., The authors acknowledge the Fonds der Chemischen Industrie, Frankfurt (Germany) for their financial support. |
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