Low Temperature Synthesis of High Purity Monoclinic Celsian.
Patent, Filed 13 Sep 90, patented 20 Aug 91,
DEPARTMENT OF THE NAVY WASHINGTON DC
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Ceramics based on monoclinic celsian BaO.Al2O3.-2SiO2 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. For example, celsian is a promising candidate for use as thermally stable dielectric and refractory materials. Accordingly, an object of this invention is to provide a method of producing pure monoclinic celsian BaO-.Al2O3.2SiO2 at lower temperatures and shorter heating times than conventional methods. Another object of this invention is to provide a method of producing monoclinic celsian without the use of chemical additives which would contaminate it and adversely affect its high temperature strength.
- Ceramics, Refractories and Glass