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The Thermal Conductivity of Polymer-Derived Amorphous Si-O-C Compounds and Nano-Composites

Gurlo, Aleksander and Ionescu, Emanuel and Riedel, Ralf and Clarke, David R. and 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, Wiley-VCH Verlag GmbH, Weinheim, pp. 281-285, 99, (1), ISSN 00027820,
DOI: 10.1111/jace.13947,
[Online-Edition: https://doi.org/10.1111/jace.13947],
[Article]

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.

Item Type: Article
Erschienen: 2015
Creators: Gurlo, Aleksander and Ionescu, Emanuel and Riedel, Ralf and Clarke, David R. and Green, D. J.
Title: The Thermal Conductivity of Polymer-Derived Amorphous Si-O-C Compounds and Nano-Composites
Language: English
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.

Journal or Publication Title: Journal of the American Ceramic Society
Volume: 99
Number: 1
Publisher: Wiley-VCH Verlag GmbH, Weinheim
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Dispersive Solids
Date Deposited: 08 Jan 2016 09:01
DOI: 10.1111/jace.13947
Official URL: https://doi.org/10.1111/jace.13947
Funders: 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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