Hostname: page-component-cd9895bd7-gxg78 Total loading time: 0 Render date: 2024-12-27T02:32:21.080Z Has data issue: false hasContentIssue false
  • English
  • Français

The Processing and Characterization of DCCA Modified Gel-Derived Silica

Published online by Cambridge University Press:  15 February 2011

S. Wallace  and
L. L. Hench
S. Wallace
Affiliation:
Department of Materials Science and Engineering, University of Florida, Gainesville, FL 32611
L. L. Hench
Affiliation:
Department of Materials Science and Engineering, University of Florida, Gainesville, FL 32611
Get access

Extract

The production of small silica gel monoliths by the hydrolysis and polycondensation of tetramethyl orthosilicate (TMS) in a methanol solution is now a common procedure. Drying is generally done slowly in a methanolic atmosphere [1] or under hypercritical conditions [2]. The potential application of sol-gel technology in the production of materials for large structures requires a rapid processing time, which causes a problem due to cracking. For large scale space structures the materials produced also require a low molecular weight, a low densification temperature, control of devitrification and a wide range of physical properties and gel densities. These requirements are potentially met by multicomponent silica based gels [3]. To decrease the drying time, which is the longest part of gel processing, the gel strength needs to be increased to resist cracking and the drying stress reduced. The gel strength can be improved by optimizing the variables in the gel manufacturing process.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 32: Symposium B – Better Ceramics Through Chemistry I , 1984 , 47
Copyright
Copyright © Materials Research Society 1984

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1. Klein, L.C. and Garvey, E. J. in: Ultrastructure Processing of Ceramics, Glasses and Composites, Hench, L.L. and Ulrich, D. R., eds. (John Wiley and Sons 1984) in press.Google Scholar
2. Zarzycki, J. in: Ultrastructure Processing of Ceramics, Glasses and Composites, L.L. Hench and D.R. Ulrich, eds. (John Wiley and Sons 1984) in press.Google Scholar
3. Wallace, S. and Hench, L.L., “Metal Organic Derived 20L Gel Monoliths,” to be published in the Proceedings of the 7th Annual Conf. on Composites and Advanced Ceramic Materials, Am. Ceram. Soc.Google Scholar
4. Schmidt, H., Scholze, H. and Kaiser, A., “Principles of Hydrolysis and Condensation Reactions of Alkoxysilanes,” Proceedings of 2nd International Workshop on Glasses and Glass Ceramics from Gels.Google Scholar
5. Prassas, M. and Hench, L.L. in: Ultrastructure Processing of Ceramics, Glasses and Composites, Hench, L.L. and Ulrich, D. R., eds. (John Wiley and Sons 1984) in press.Google Scholar
6. Nogami, M. and Moruja, Y., Yogyo-Kyokai-Shi 87, 34–42 (1979).CrossRefGoogle Scholar
7. Phalippou, J., Woignier, T. and Zarycki, J. in: Ultrastructure Processing of Ceramics, Glasses and Composites, Hench, L.L. and Ulrich, D. R., eds. (John Wiley and Sons 1984) in press.Google Scholar
8. Wang, S.H. and Hench, L.L., “Processing Variables of Sol-Gel Derived 20 Soda Silicates,” to be published in the Proceedings of the 7th Annual Conf. on Composites and Advanced Ceramic Materials, Am. Ceram. Soc.Google Scholar