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High-Temperature Creep Behavior of SiOC Glass-Ceramics: Influence of Network Carbon Versus Segregated Carbon

Ionescu, Emanuel and Balan, Corneliu and Kleebe, Hans-Joachim and Müller, Mathis M. and Guillon, Olivier and Schliephake, Daniel and Heilmaier, Martin and Riedel, Ralf and Sglavo, V. (2014):
High-Temperature Creep Behavior of SiOC Glass-Ceramics: Influence of Network Carbon Versus Segregated Carbon.
In: Journal of the American Ceramic Society, WILEY-VCH Verlag GmbH & Co. KGaA, pp. 3935-3942, 97, (12), ISSN 00027820,
[Online-Edition: http://dx.doi.org/10.1111/jace.13206],
[Article]

Abstract

Three silicon oxycarbide samples with different carbon contents are analyzed in the present study with respect to their high-temperature creep behavior. The tests were performed in compression at 1100°C, 1200°C, and 1300°C; in this temperature range the mechanism of creep relies on viscoelastic flow within the samples and has been modeled with the Jeffreys viscoelastic model. After the release of the applied mechanical stress, a viscoelastic recovery behavior was observed in all samples. The creep behavior of the investigated samples indicates two rheological contributions in SiOC: (i) a high viscous answer, coming from the silica-rich network, and (ii) an elastic response from the segregated carbon phase within the samples. Furthermore, two distinct effects of the carbon phase on the HT creep behavior of SiOC were identified and are discussed in the present paper: the effect of the carbon presence within the SiOC network (the “carbidic” carbon), which induces a significant increase in the viscosity and a strong decrease in the activation energy for creep, as compared to vitreous silica; and the influence of the segregated carbon phase (the “free” carbon), which has been shown to affect the viscosity and the activation energy of creep and dominates the creep behavior in phase-separated silicon oxycarbides.

Item Type: Article
Erschienen: 2014
Creators: Ionescu, Emanuel and Balan, Corneliu and Kleebe, Hans-Joachim and Müller, Mathis M. and Guillon, Olivier and Schliephake, Daniel and Heilmaier, Martin and Riedel, Ralf and Sglavo, V.
Title: High-Temperature Creep Behavior of SiOC Glass-Ceramics: Influence of Network Carbon Versus Segregated Carbon
Language: English
Abstract:

Three silicon oxycarbide samples with different carbon contents are analyzed in the present study with respect to their high-temperature creep behavior. The tests were performed in compression at 1100°C, 1200°C, and 1300°C; in this temperature range the mechanism of creep relies on viscoelastic flow within the samples and has been modeled with the Jeffreys viscoelastic model. After the release of the applied mechanical stress, a viscoelastic recovery behavior was observed in all samples. The creep behavior of the investigated samples indicates two rheological contributions in SiOC: (i) a high viscous answer, coming from the silica-rich network, and (ii) an elastic response from the segregated carbon phase within the samples. Furthermore, two distinct effects of the carbon phase on the HT creep behavior of SiOC were identified and are discussed in the present paper: the effect of the carbon presence within the SiOC network (the “carbidic” carbon), which induces a significant increase in the viscosity and a strong decrease in the activation energy for creep, as compared to vitreous silica; and the influence of the segregated carbon phase (the “free” carbon), which has been shown to affect the viscosity and the activation energy of creep and dominates the creep behavior in phase-separated silicon oxycarbides.

Journal or Publication Title: Journal of the American Ceramic Society
Volume: 97
Number: 12
Publisher: WILEY-VCH Verlag GmbH & Co. KGaA
Divisions: 11 Department of Materials and Earth Sciences > Earth Science > Geo-Material-Science
11 Department of Materials and Earth Sciences > Material Science > Dispersive Solids
11 Department of Materials and Earth Sciences > Earth Science
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 08 Jan 2015 09:11
Official URL: http://dx.doi.org/10.1111/jace.13206
Identification Number: doi:10.1111/jace.13206
Funders: Funded by the Ministry of Higher Education, Research and Arts in Hesse, Funded by TU Darmstadt, Funded by UEFISCDI. Grant Number: PN-II-ID-PCE-2012-4-0245
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