Low Temperature Synthesis of High Purity Monoclinic Celsian Using Topaz.
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 07, 1990
- Accession Number
- ADD014712
Entities
People
- Deborah A. Haught
- Inna G. Talmy
Organizations
- United States Department of the Navy