METHOD FOR PRODUCTION OF ROCKET ANTENNA DOMES OF QUARTZ CERAMICS Russian patent published in 2017 - IPC H01Q1/42 

FIELD: technological processes.

SUBSTANCE: method includes moulding a ceramic shell from the aqueous slurry of quartz glass in a plaster mould by the slip casting process, drying, burning and machining of the shell using a diamond tool, hermetic sealing and hardening the shell by organo-polymer, radio refinement, fabricating the shell with a metal frame using a sealant. As the feed stock quartz glass, containing at least 99.8% of SiO₂, is used. And the moulding of a ceramic blank is performed using polydisperse aqueous slip of quartz glass with the grain-size composition from 0.1 to 500-micron, density of 1.87-1.90 g/cm³, with a provided branch and collector of gravity sediment. The material baking is performed in air under the conditions, which prevent the formation of cristobalite to the porosity of 8.0-11.0% and bending strength of at least 35 MPa. Then the product is machined down to the specified sizes with the help of a diamond tool having a cutting depth of maximum 2.0 mm, hardening and hermitic sealing of the porous shell, impregnated on the inner surface with a high-temperature organic-silicon polymer by 20-40% of the wall thickness and with a dielectric capacitance of the material in the shell radio transparent zone of maximum 3.5 points, radio refinement on the outer surface by smooth profiling of the wall thickness using the diamond tool, following the specifications for the product contour. Then two layers of organic-silicon enamel of KO-5189 type are applied. One layer of the enamel suspension has a lower viscosity (for partial impregnation of the porous ceramics), the second layer is for forming a continuous film with a total thickness up to 100 micron. The assembly of the product with an invar frame is performed with the help of elastic Y-2-28 sealant on a special assembly bench with aligning and hold-down of the frame and shell to the constant thickness of the adhesive-bonded joint within the range of 0.1-0.4 mm.

EFFECT: higher availability of the rocket domes.

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