Chapter 60. Sintering of Silica Gels at a Constant Rate of Heating
- John B. Wachtman Jr.
Published Online: 28 MAR 2008
Copyright © 1994 The American Ceramic Society
Proceedings of the 18th Annual Conference on Composites and Advanced Ceramic Materials - A: Ceramic Engineering and Science Proceedings, Volume 15, Issue 4
How to Cite
Zhu, B. F. and Hench, L. L. (1994) Sintering of Silica Gels at a Constant Rate of Heating, in Proceedings of the 18th Annual Conference on Composites and Advanced Ceramic Materials - A: Ceramic Engineering and Science Proceedings, Volume 15, Issue 4 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470314500.ch60
- Published Online: 28 MAR 2008
- Published Print: 1 JAN 1994
Print ISBN: 9780470375327
Online ISBN: 9780470314500
- silica gel;
- dried gel;
An alkoxide-derived amorphous silica gel is thermodynamically unstable due to its excess surface energy and free volume. Compared with the conventional isothermal method, the constant-rate-heating (CRH) technique is faster, and provides more details in studying the initial-stage of sintering for thermally unstable materials like a dried gel. The sinterability of porous silica gels was investigated using nonisothermal techniques and dilatometry. It was found that generally only one rate-controlling mechanism of sintering was predominant at a certain temperature region. Results from this CRH study are compared to the sintering kinetics predicted from a cylindrical model.