METHOD OF PRODUCING HIGH-TEMPERATURE RADIO ENGINEERING MATERIAL Russian patent published in 2013 - IPC C04B35/80 

FIELD: radio engineering, communication.

SUBSTANCE: volume-reinforced woven materials made of silica and quartz fibres are impregnated with aqueous silica sol solution, followed by drying and heat treatment. The "impregnation, drying, heat treatment" cycle is repeated until density of the workpieces reaches 1400±100 kg/m³. Drying is carried out on air and heat treatment is carried out as follows: raising temperature to 120±50°C and holding for 3.0±0.5 hours; raising temperature to 230±50°C and holding for 3.0±0.5 hours; raising temperature to 500±50°C and holding for 5.0±0.5 hours. Further, impregnation is continued with water-soluble zirconium compounds with concentration of 30-55%. Heat treatment is carried out as follows: raising temperature to 150±100°C and holding for 3.0±0.5 hours; raising temperature to 600±100°C and holding for 6.0±0.5 hours until density of the workpieces reaches 1600±100 kg/m³. The zirconium compounds used are zirconyl nitrate solution or zirconyl chloride solution.

EFFECT: high operating temperature of radio engineering material with maximum preservation of dielectric properties of the material.

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