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

Christina Stabler, Felix Roth, Masaki Narisawa, Daniel Schliephake, Martin Heilmaier, Stefan Lauterbach, Hans Joachim Kleebe, Ralf Riedel, Emanuel Ionescu

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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.

Original languageEnglish
Pages (from-to)3747-3753
Number of pages7
JournalJournal of the European Ceramic Society
Volume36
Issue number15
DOIs
Publication statusPublished - 1 Nov 2016
Externally publishedYes

Keywords

  • Glass ceramic
  • High-temperature creep
  • Segregated carbon
  • Silicon oxycarbide

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