Chapter 32. Microstructure and Viscosity of Hot Pressed Silicon Oxycarbide Glasses
- John B. Wachtman Jr.
Published Online: 26 MAR 2008
Copyright © 1993 The American Ceramic Society
Proceedings of the 17th Annual Conference on Composites and Advanced Ceramic Materials, Part 2 of 2: Ceramic Engineering and Science Proceedings, Volume 14, Issue 9/10
How to Cite
Hammond, M., Breval, E. and Pantano, C. G. (1993) Microstructure and Viscosity of Hot Pressed Silicon Oxycarbide Glasses, in Proceedings of the 17th Annual Conference on Composites and Advanced Ceramic Materials, Part 2 of 2: Ceramic Engineering and Science Proceedings, Volume 14, Issue 9/10 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470314234.ch32
- Published Online: 26 MAR 2008
- Published Print: 1 JAN 1993
Print ISBN: 9780470375273
Online ISBN: 9780470314234
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 process these materials was expected to influence their final microstructure and properties. The materials were characterized by chemical analysis, x-ray diffraction, TEM and29Si MAS 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 10–103times greater than that of fused silica.