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High-temperature creep behavior of a SiOC glass ceramic free of segregated carbon

Stabler, Christina and Roth, Felix and Narisawa, Masaki and Schliephake, Daniel and Heilmaier, Martin and Lauterbach, Stefan and Kleebe, Hans-Joachim and Riedel, Ralf and Ionescu, Emanuel (2016):
High-temperature creep behavior of a SiOC glass ceramic free of segregated carbon.
In: Journal of the European Ceramic Society, Elsevier Science Publishing, pp. 3747-3753, 36, (15), ISSN 09552219,
[Online-Edition: http://doi.org/10.1016/j.jeurceramsoc.2016.04.015],
[Article]

Abstract

In this study we present the high-temperature creep behavior of a dense SiOC glass ceramic free of segregated carbon. Solid-state NMR spectroscopy, XRD and TEM investigations indicate that the sample consists of β-SiC nanoparticles homogeneously dispersed in an amorphous silica matrix. Compression creep experiments were performed at 1100–1300 °C and stresses of 50–100 MPa. The calculated creep viscosity of SiOC is two orders of magnitude higher than that of pure silica. Whereas the activation energy for creep (696 kJ/mol) is close to that determined in pure silica glass. However, a stress exponent of 1.7 was calculated, suggesting that other mechanisms might contribute to the creep in addition to the Newtonian viscous flow. The strong difference in the creep rates and creep mechanism of the SiOC glass ceramic and amorphous silica is discussed in terms of possible contributions of the interface between the silica matrix and the β-SiC nanoparticles.

Item Type: Article
Erschienen: 2016
Creators: Stabler, Christina and Roth, Felix and Narisawa, Masaki and Schliephake, Daniel and Heilmaier, Martin and Lauterbach, Stefan and Kleebe, Hans-Joachim and Riedel, Ralf and Ionescu, Emanuel
Title: High-temperature creep behavior of a SiOC glass ceramic free of segregated carbon
Language: English
Abstract:

In this study we present the high-temperature creep behavior of a dense SiOC glass ceramic free of segregated carbon. Solid-state NMR spectroscopy, XRD and TEM investigations indicate that the sample consists of β-SiC nanoparticles homogeneously dispersed in an amorphous silica matrix. Compression creep experiments were performed at 1100–1300 °C and stresses of 50–100 MPa. The calculated creep viscosity of SiOC is two orders of magnitude higher than that of pure silica. Whereas the activation energy for creep (696 kJ/mol) is close to that determined in pure silica glass. However, a stress exponent of 1.7 was calculated, suggesting that other mechanisms might contribute to the creep in addition to the Newtonian viscous flow. The strong difference in the creep rates and creep mechanism of the SiOC glass ceramic and amorphous silica is discussed in terms of possible contributions of the interface between the silica matrix and the β-SiC nanoparticles.

Journal or Publication Title: Journal of the European Ceramic Society
Volume: 36
Number: 15
Publisher: Elsevier Science Publishing
Uncontrolled Keywords: Silicon oxycarbide, High-temperature creep, Segregated carbon, Glass ceramic
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: 17 Aug 2016 08:43
Official URL: http://doi.org/10.1016/j.jeurceramsoc.2016.04.015
Additional Information:

Preparation and Application of Ultra-high Temperature Ceramic Matrix Composites

Identification Number: doi:10.1016/j.jeurceramsoc.2016.04.015
Funders: Financial support from the Deutsche Forschungsgemeinschaft (IO 64/7-1, “High-Temperature Creep in SiOC-Based Glasses and Glass-Ceramics”) is gratefully acknowledged., Financial support from NST (National Research Council of Science & Technology) of Republic of Korea (Grant: CMIP-13-4-KIMS) is gratefully acknowledged., Financial support from the R&D Convergence Program of MSIP (Ministry of Science, ICT and Future Planning) is gratefully acknowledged.
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