Processing and Properties of Cellular Silica Synthesized by Foaming Sol-gelsJournal of the American Ceramic Society
AbstractA 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,
Document TypeArticle - Journal
Rights© 1990 Wiley-Blackwell, All rights reserved.
Citation InformationTakamitsu 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)
Available at: http://works.bepress.com/wayne-huebner/44/