METHOD OF PRODUCTION OF ARTICLES FROM GLASS CERAMIC MATERIAL OF LITHIUM-ALUMINO-SILICATE COMPOSITION Russian patent published in 2004 - IPC

FIELD: production of radio transparent large-sized articles of complex form from glass ceramic materials of lithium- alumino-silicate composition; ceramic and aviation industries. SUBSTANCE: proposed method consists in introduction of quartz glass slip in the amount of 5-40 vol-% into lithium-alumino-silicate glass slip. Mixture thus obtained is molded in porous molds and is subjected to heat treatment. Proposed method considerably increases field of application of articles due to extended boundaries of dielectric permittivity within ε = 5,0÷7,0, at simultaneous reduction of tangent of angle of dielectric losses from tgθ = 110•10^-4 to tgθ = 70•10^-4 at retained high strength of material >90MPa and heat resistance >800^°C. EFFECT: enhanced efficiency; improved strength characteristics. 3 tbl