Microstructure and viscosity of hot perssed silicon oxycarbide glasses

Michael Hammond, Else Breval, Carlo G. Pantano

Research output: Contribution to journalConference articlepeer-review

33 Scopus citations

Abstract

The microstructural evolution of silicon oxycarbide glasses has been studied as a function of hot pressing temperature up to 1650°C. The silicon oxycarbide glasses were synthesized using a sol/gel process. Due to the metastable nature of the oxycarbide glass precursor, the temperature and pressure used to precess these materials was expected to influence their final microstructure and properties. The materials were characterized by chemical analysis, x-ray diffraction. TEM and 29SiMAS NMR. It was found that the hot pressed oxycarbide glasses contained 5-20nm SiC microcrystals homogeneously distributed within an amorphous matrix of silica, silicon oxycarbide, and carbon; i.e., a silicon oxycarbide glass-ceramic. The viscosity of the oxycarbide glass-ceramics was found to be approximately 10-103 times greater than that of fused silica.

Original languageEnglish (US)
Pages (from-to)947-954
Number of pages8
JournalCeramic Engineering and Science Proceedings
Volume14
Issue number9 -10 pt 2
StatePublished - Sep 1993
EventProceedings of the 17th Annual Conference on Composites and Advanced Ceramic Materials - Cocoa Beach, FL, USA
Duration: Jan 10 1993Jan 15 1993

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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