Accession Number:
ADD014712
Title:
Low Temperature Synthesis of High Purity Monoclinic Celsian Using Topaz.
Descriptive Note:
Patent Application, Filed 7 Sep 90,
Corporate Author:
DEPARTMENT OF THE NAVY WASHINGTON DC
Personal Author(s):
Report Date:
1990-09-07
Pagination or Media Count:
10.0
Abstract:
This invention relates to ceramics and more particularly to aluminosilicate ceramics. Ceramics based on monoclinic celsian BaO-A12O3-2Si02 can be considered for applications requiring materials with a combination of high melting point, low thermal expansion, high thermal shock resistance, high-frequency working capabilities, low and thermally stable dielectric constant and low loss tangent. A process for preparing monoclinic celsian from topaz and BaCO3, powders by heating an intimate mixture of the powders at a temperature of from 900 degree C to less then 1590 degree C in an atmosphere of the gases generated by the monoclinic celsian formation reaction itself. ttl
Descriptors:
Subject Categories:
- Industrial Chemistry and Chemical Processing
- Ceramics, Refractories and Glass