Nanostructural Characterization of Silicon Oxycarbide Glasses and Glass‐Ceramics

Else Breval, Michael Hammond, Carlo G. Pantano

Research output: Contribution to journalArticle

59 Citations (Scopus)

Abstract

Silicon oxycarbide glasses were synthesized by the sol‐gel process using precursors such as methyl‐, propyl‐, and phenyltrimethoxysilanes. The final products contained 14–38 wt% carbon. A TEM study on the nanometer scale revealed that all of the materials were amorphous and monophasic, and that it was not possible to detect any crystalline or otherwise distinct carbon phases. Hot‐pressing the glasses led to the crystallization of graphite and silicon carbide within the amorphous matrix. X‐ray and electron diffraction showed increasing crystallinity at the higher hot‐pressing temperatures. Hot pressing at 1400°C resulted in the appearance of fine‐grained silicon carbide, whereas at the highest temperature (1650°C), graphite and both hexagonal and cubic silicon carbide were produced. Subsequent heat treatment of the hot‐pressed glasses under an argon atmosphere at 1400°C resulted in the formation of cristobalite. The glass‐ceramics produced at the highest hot‐pressing temperatures were more resistant to the crystallization of cristobalite during subsequent heat treatments.

Original languageEnglish (US)
Pages (from-to)3012-3018
Number of pages7
JournalJournal of the American Ceramic Society
Volume77
Issue number11
DOIs
StatePublished - Jan 1 1994

Fingerprint

Silicon
Silicon carbide
silicon
Graphite
glass
Crystallization
Silicon Dioxide
Glass
cristobalite
Carbon
Heat treatment
graphite
crystallization
Argon
Hot pressing
Electron diffraction
Temperature
carbon
crystallinity
argon

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

Cite this

Breval, Else ; Hammond, Michael ; Pantano, Carlo G. / Nanostructural Characterization of Silicon Oxycarbide Glasses and Glass‐Ceramics. In: Journal of the American Ceramic Society. 1994 ; Vol. 77, No. 11. pp. 3012-3018.
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Nanostructural Characterization of Silicon Oxycarbide Glasses and Glass‐Ceramics. / Breval, Else; Hammond, Michael; Pantano, Carlo G.

In: Journal of the American Ceramic Society, Vol. 77, No. 11, 01.01.1994, p. 3012-3018.

Research output: Contribution to journalArticle

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