z-logo
Premium
Processing and Properties of Cellular Silica Synthesized by Foaming Sol‐Gels
Author(s) -
Fujiu Takamitsu,
Messing Gary L.,
Huebner Wayne
Publication year - 1990
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1990.tb05095.x
Subject(s) - materials science , dielectric , composite material , viscosity , flexural strength , ceramic , cell size , spheres , sol gel , foaming agent , chemical engineering , porosity , nanotechnology , physics , optoelectronics , astronomy , engineering , biology , microbiology and biotechnology
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.

This content is not available in your region!

Continue researching here.

Having issues? You can contact us here