Processing and Properties of Cellular Silica Synthesized by Foaming Sol‐Gels

Takamitsu Fujiu, Gary Lynn Messing, Wayne Huebner

Research output: Contribution to journalArticle

70 Citations (Scopus)

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.

Original languageEnglish (US)
Pages (from-to)85-90
Number of pages6
JournalJournal of the American Ceramic Society
Volume73
Issue number1
DOIs
StatePublished - Jan 1 1990

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Polymethyl Methacrylate
Sols
Silicon Dioxide
Silica
Viscosity
Blowing agents
Space shuttles
Gelation
Fused silica
Dielectric losses
Tile
Processing
Bending strength
Foams
Permittivity
Gels
Glass

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

Cite this

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Processing and Properties of Cellular Silica Synthesized by Foaming Sol‐Gels. / Fujiu, Takamitsu; Messing, Gary Lynn; Huebner, Wayne.

In: Journal of the American Ceramic Society, Vol. 73, No. 1, 01.01.1990, p. 85-90.

Research output: Contribution to journalArticle

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