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Thermal Properties of SiOC Glasses and Glass Ceramics at Elevated Temperatures

Stabler, Christina ; Reitz, Andreas ; Stein, Peter ; Albert, Barbara ; Riedel, Ralf ; Ionescu, Emanuel (2023)
Thermal Properties of SiOC Glasses and Glass Ceramics at Elevated Temperatures.
In: Materials, 2018, 11 (2)
doi: 10.26083/tuprints-00016943
Article, Secondary publication, Publisher's Version

Copyright Information: CC BY 4.0 International - Creative Commons, Attribution.

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Item Type: Article
Type of entry: Secondary publication
Title: Thermal Properties of SiOC Glasses and Glass Ceramics at Elevated Temperatures
Language: English
Date: 20 November 2023
Place of Publication: Darmstadt
Year of primary publication: 2018
Place of primary publication: Basel
Publisher: MDPI
Journal or Publication Title: Materials
Volume of the journal: 11
Issue Number: 2
Collation: 18 Seiten
DOI: 10.26083/tuprints-00016943
Corresponding Links:
Origin: Secondary publication DeepGreen

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)

Uncontrolled Keywords: silicon oxycarbide, silicon oxide carbide, thermal transport, thermal conductivity, thermal expansion
Status: Publisher's Version
URN: urn:nbn:de:tuda-tuprints-169435
Additional Information:

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

Classification DDC: 500 Science and mathematics > 540 Chemistry
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Dispersive Solids
07 Department of Chemistry > Eduard Zintl-Institut > Fachgebiet Anorganische Chemie
Date Deposited: 20 Nov 2023 15:08
Last Modified: 28 Nov 2023 15:45
SWORD Depositor: Deep Green
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/16943
PPN: 513528881
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