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Processing and Properties of Cellular Silica Synthesized by Foaming Sol-gels
Journal of the American Ceramic Society
  • Takamitsu Fujiu
  • Gary L. Messing
  • Wayne Huebner, Missouri University of Science and Technology
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.
Materials Science and Engineering
Keywords and Phrases
  • Foamed Ceramics,
  • Silica,
  • Fabrication,
  • Viscosity,
  • Sols
Document Type
Article - Journal
Document Version
File Type
© 1990 Wiley-Blackwell, All rights reserved.
Publication Date
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)
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