RADIO-TRANSPARENT PROTECTIVE COATING OF ARTICLES FROM CERAMICS, GLASS-CERAMIC, GLASS CERAMIC AND METHOD FOR PRODUCTION THEREOF Russian patent published in 2016 - IPC C04B41/87 

FIELD: ceramic industry.

SUBSTANCE: invention relates to production of ceramic and glass-ceramic articles, operating under conditions of high heat and power loads with one-sided heating. Disclosed is composition and method of producing radiotransparent, impact-resistant protective coatings for radio engineering purposes articles, for example antenna domes, radio-transparent windows from brittle inorganic materials. Radio-transparent protective coating of ceramic articles, glass ceramic, glass-ceramic comprises quartz glass-cloth, dressed with aluminium and/or chromium oxides, impregnated with binder aqueous solution, consisting of chrome alumino-phosphatic binder, alkaline silica sol and powder filler with particles size of 0.5-100 mqm from article material with following ratio of components, wt%: chrome alumino-phosphatic binder 2-10; alkaline silica sol 35-45; powdered filler 45-55, and coating thickness is 0.5-5.0 mm. Method of radiotransparent protective coating producing involves layer by layer application of quartz glass fabric on article, glazed by “sol-gel” technology with aluminium and/or chrome oxides and impregnated with aqueous solution of chrome alumino-phosphatic binder, alkaline silica sol and powder filler with particles size of 0.5-100 mqm from article material in specified ratio, followed by vacuuming and pressing during heating to temperature of 300-350 °C, which is followed by heat treatment at temperature of 400-600 °C for 1-2 hours.

EFFECT: proposed coating considerably increases ceramic thin-walled articles resistance to power and heat loads, ensures preservation of radio properties in wide range of operating temperatures, better heat protection both articles themselves, and located inside assemblies and articles.

4 cl, 1 tbl, 3 ex