Influence of SiC/silica and carbon/silica interfaces on the high-temperature creep of silicon oxycarbide-based glass ceramics: a case study

Christina Stabler, Daniel Schliephake, Martin Heilmaier, Tanguy Rouxel, Hans Joachim Kleebe, Masaki Narisawa, Ralf Riedel, Emanuel Ionescu

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5 Citations (Scopus)

Abstract

In the present study, the high-temperature creep behavior of three SiOC glass ceramics with different phase compositions are compared by the authors. All three SiOC glass ceramics have a vitreous silica matrix in common, but comprise different homogeneously dispersed phases: 1) only spherical β-SiC nanoparticles (sample denoted hereafter SiC/SiO2), 2) only high-aspect ratio sp2-hybridized carbon (i.e., C/SiO2), and 3) both phases (SiC and segregated carbon, i.e., C/SiC/SiO2). Compression creep experiments are performed at temperatures in the range between 1100 and 1300 °C and true stresses of 50 to 200 MPa. The determined activation energy for creep of the SiOC glass ceramics of around 700 kJ mol−1 is independent of the phase composition. A stress exponent value of approximately 2 indicates an interface-controlled deformation mechanism. All SiOC glass ceramics exhibit significantly higher creep viscosities than that of vitreous silica. Surprisingly, the spherical β-SiC nanoparticles have a higher impact on the effective creep viscosities of SiOC as compared to that of the high-aspect ratio segregated carbon phase. It is concluded that this originates from the β-SiC/silica and C/silica interfaces, which have different effects on the creep behavior of silicon oxycarbide-based glass ceramics.

Original languageEnglish
Article number1800596
Number of pages11
JournalAdvanced Engineering Materials
Volume21
Issue number6
DOIs
Publication statusPublished - 1 Jun 2019
Externally publishedYes

Keywords

  • glass ceramics
  • high-temperature creep
  • interface-controlled creep
  • interfaces
  • silicon oxycarbide

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