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

Takamitsu Fujiu, Gary L. Messing, Wayne Huebner

Research output: Contribution to journalArticle

70 Scopus citations

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 1990

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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