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Thermal Properties of SiOC Glasses and Glass Ceramics at Elevated Temperatures

Stabler, Christina and Reitz, Andreas and Stein, Peter and Albert, Barbara and Riedel, Ralf and Ionescu, Emanuel (2018):
Thermal Properties of SiOC Glasses and Glass Ceramics at Elevated Temperatures.
In: Materials, p. 279, 11, (2), ISSN 1996-1944,
DOI: 10.3390/ma11020279,
[Online-Edition: https://doi.org/10.3390/ma11020279],
[Article]

Abstract

In the present study, the effect of the chemical and phase composition on the thermal properties of silicon oxide carbides (SiOC) has been investigated. Dense monolithic SiOC materials with various carbon contents were prepared and characterized with respect to their thermal expansion, as well as thermal conductivity. SiOC glass has been shown to exhibit low thermal expansion (e.g., ca. 3.2 × 10−6 K−1 for a SiOC sample free of segregated carbon) and thermal conductivity (ca. 1.5 W/(m∙K)). Furthermore, it has been observed that the phase separation, which typically occurs in SiOC exposed to temperatures beyond 1000–1200 °C, leads to a decrease of the thermal expansion (i.e., to 1.83 × 10−6 K−1 for the sample above); whereas the thermal conductivity increases upon phase separation (i.e., to ca. 1.7 W/(m∙K) for the sample mentioned above). Upon adjusting the amount of segregated carbon content in SiOC, its thermal expansion can be tuned; thus, SiOC glass ceramics with carbon contents larger than 10–15 vol % exhibit similar coefficients of thermal expansion to that of the SiOC glass. Increasing the carbon and SiC content in the studied SiOC glass ceramics leads to an increase in their thermal conductivity: SiOC with relatively large carbon and silicon carbides (SiC) volume fractions (i.e., 12–15 and 20–30 vol %, respectively) were shown to possess thermal conductivities in the range from 1.8 to 2.7 W/(m∙K).

Item Type: Article
Erschienen: 2018
Creators: Stabler, Christina and Reitz, Andreas and Stein, Peter and Albert, Barbara and Riedel, Ralf and Ionescu, Emanuel
Title: Thermal Properties of SiOC Glasses and Glass Ceramics at Elevated Temperatures
Language: German
Abstract:

In the present study, the effect of the chemical and phase composition on the thermal properties of silicon oxide carbides (SiOC) has been investigated. Dense monolithic SiOC materials with various carbon contents were prepared and characterized with respect to their thermal expansion, as well as thermal conductivity. SiOC glass has been shown to exhibit low thermal expansion (e.g., ca. 3.2 × 10−6 K−1 for a SiOC sample free of segregated carbon) and thermal conductivity (ca. 1.5 W/(m∙K)). Furthermore, it has been observed that the phase separation, which typically occurs in SiOC exposed to temperatures beyond 1000–1200 °C, leads to a decrease of the thermal expansion (i.e., to 1.83 × 10−6 K−1 for the sample above); whereas the thermal conductivity increases upon phase separation (i.e., to ca. 1.7 W/(m∙K) for the sample mentioned above). Upon adjusting the amount of segregated carbon content in SiOC, its thermal expansion can be tuned; thus, SiOC glass ceramics with carbon contents larger than 10–15 vol % exhibit similar coefficients of thermal expansion to that of the SiOC glass. Increasing the carbon and SiC content in the studied SiOC glass ceramics leads to an increase in their thermal conductivity: SiOC with relatively large carbon and silicon carbides (SiC) volume fractions (i.e., 12–15 and 20–30 vol %, respectively) were shown to possess thermal conductivities in the range from 1.8 to 2.7 W/(m∙K).

Journal or Publication Title: Materials
Volume: 11
Number: 2
Uncontrolled Keywords: silicon oxycarbide, silicon oxide carbide, thermal transport, thermal conductivity, thermal expansion
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
11 Department of Materials and Earth Sciences > Material Science > Mechanics of functional Materials
07 Department of Chemistry
07 Department of Chemistry > Fachgebiet Anorganische Chemie
Date Deposited: 13 Apr 2018 11:42
DOI: 10.3390/ma11020279
Official URL: https://doi.org/10.3390/ma11020279
Additional Information:

This article belongs to the Special Issue Polymer Derived Ceramics and Applications

Funders: Financial support was provided from the Deutsche Forschungsgemeinschaft (IO 64/7-1, “High-Temperature Creep in SiOC-Based Glasses and Glass-Ceramics”)., EI furthermore acknowledges support from the EU COST Action CM1302 (European network “Smart Inorganic Polymers”, SIPs).
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