Gurlo, Aleksander ; Ionescu, Emanuel ; Riedel, Ralf ; Clarke, David R. ; Green, D. J. (2015)
The Thermal Conductivity of Polymer-Derived Amorphous Si-O-C Compounds and Nano-Composites.
In: Journal of the American Ceramic Society, 99 (1)
doi: 10.1111/jace.13947
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
Silicon oxycarbide glasses can be produced over a range of Si–O–C compositions by the controlled pyrolysis of polymer precursors. We present measurements of the thermal conductivity of a silicon oxycarbide glass after two different heat treatments and two Si–O–C nano-composites, hot-pressed at 1600°C, up to 1000°C and compare them to fused silica, amorphous carbon, and SiC. The temperature dependence of their thermal conductivities is similar to other amorphous materials. The presence of low volume fractions of nanoparticles of hafnia (4.5 v/o) or zirconia (7.4 v/o) dispersed within the amorphous matrix only modifies the conductivity slightly, consistent with a simple Maxwell model, and does not affect the temperature dependence of the thermal conductivity above room temperature.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2015 |
| Autor(en): | Gurlo, Aleksander ; Ionescu, Emanuel ; Riedel, Ralf ; Clarke, David R. ; Green, D. J. |
| Art des Eintrags: | Bibliographie |
| Titel: | The Thermal Conductivity of Polymer-Derived Amorphous Si-O-C Compounds and Nano-Composites |
| Sprache: | Englisch |
| Publikationsjahr: | 6 Oktober 2015 |
| Verlag: | Wiley-VCH Verlag GmbH, Weinheim |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Journal of the American Ceramic Society |
| Jahrgang/Volume einer Zeitschrift: | 99 |
| (Heft-)Nummer: | 1 |
| DOI: | 10.1111/jace.13947 |
| URL / URN: | https://doi.org/10.1111/jace.13947 |
| Kurzbeschreibung (Abstract): | Silicon oxycarbide glasses can be produced over a range of Si–O–C compositions by the controlled pyrolysis of polymer precursors. We present measurements of the thermal conductivity of a silicon oxycarbide glass after two different heat treatments and two Si–O–C nano-composites, hot-pressed at 1600°C, up to 1000°C and compare them to fused silica, amorphous carbon, and SiC. The temperature dependence of their thermal conductivities is similar to other amorphous materials. The presence of low volume fractions of nanoparticles of hafnia (4.5 v/o) or zirconia (7.4 v/o) dispersed within the amorphous matrix only modifies the conductivity slightly, consistent with a simple Maxwell model, and does not affect the temperature dependence of the thermal conductivity above room temperature. |
| 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: | 08 Jan 2016 09:01 |
| Letzte Änderung: | 30 Jan 2019 11:20 |
| PPN: | |
| Sponsoren: | The authors are grateful to the Office of Naval Research under grant N00014-012-1-0993 for support of the research performed at Harvard and to the Humboldt Foundation for a Feodor Lynen Fellowship for AG at Harvard., We are also grateful to the Netzsch Instruments for making the thermal diffusivity measurements below room temperature. |
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