Article
Processing and Properties of Cellular Silica Synthesized by Foaming Sol-gels
Journal of the American Ceramic Society
Abstract
A novel process for fabricating lightweight, cellular ceramics from sols is presented. the process utilizes the rapid viscosity change during gelation to stabilize the structure of a foamed silica sol. Manipulation of gel viscosity and foaming agent concentration resulted in a minimum cell size of 90 μm at 31% density and minimum density of 17% with average cell size of 400 μm. the flexural strength compared favorably with space shuttle tiles and sintered hollow glass spheres. From −50° to 150°C, the dielectric constant ranged from 1.51 to 1.55 for a 20% dense foam and was slightly dispersive, whereas the dielectric loss was comparable with fused silica.
Department(s)
Materials Science and Engineering
Keywords and Phrases
- Foamed Ceramics,
- Silica,
- Fabrication,
- Viscosity,
- Sols
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 1990 Wiley-Blackwell, All rights reserved.
Publication Date
1-1-1990
Publication Date
01 Jan 1990
Disciplines
Citation Information
Takamitsu Fujiu, Gary L. Messing and Wayne Huebner. "Processing and Properties of Cellular Silica Synthesized by Foaming Sol-gels" Journal of the American Ceramic Society (1990) ISSN: 0002-7820; 1551-2916 Available at: http://works.bepress.com/wayne-huebner/44/