RU2474013C1 - Antenna dome - Google Patents

Abstract

FIELD: radio engineering.

SUBSTANCE: antenna dome is proposed, which contains radio transparent cover from porous ceramics with polymer introduced to pores, bound with a sealant layer to frame. Antenna dome differs by the fact that radio transparent ceramic cover includes polymer introduced to pores over the entire volume. Antenna dome designed as per the proposed solution allows sufficiently simplifying the design of antenna dome from porous ceramics, and as consequence, simplifying its manufacturing procedure, which results in reduction of labour intensity and prime cost.

EFFECT: simpler design and manufacturing procedure of antenna dome from porous ceramics.

Description

The invention relates to the field of aviation and rocket technology and can be used in the manufacture of antenna fairings for high-speed rockets from porous ceramics.

Known head antenna rocket fairing (RF Patent No. 2209494, H01Q 1/42 dated 07/27/03), in which the radiolucent sheath consists of a radiolucent internal power element made of porous quartz ceramic with a polymer introduced into the pores and an external heat-protective element made of porous quartz ceramic, the thickness of the radiotransparent internal power element is 0.05-0.10 of the total wall thickness of the radiotransparent shell or evenly increases from the toe to the base to a value corresponding to 0.1-0.9 of the total wall thickness, and the thickness of the outer heat-shielding element changes inversely with the preservation of the total electric thickness of the wall of the radiolucent sheath, while a moisture-proof coating is applied to the outer surface of the outer heat-shielding element. The advantage of this design is that it provides for hardening and sealing of the porous ceramic shell, which increased the carrying capacity of the fairing made of quartz ceramics and ensured its moisture resistance.

The disadvantages of the known design include the fact that this fairing design has found its application for air-to-air missiles that are not exposed to prolonged climatic effects. This is due to the fact that as a result of exposure to the moisture-proof coating of the outer surface of the fairing of solid objects and particles (dust, hail, etc.), it is easily destroyed, which leads to the loss of moisture protection of the fairing and, as a result, to the loss of radio technical characteristics (PTX) .

The closest technical solution is the rocket antenna fairing (RF Patent No. 2256262, H01Q 1/42 dated 07/10/05) containing a radiolucent sheath made of porous quartz ceramics, consisting of a heat-shielding element made of porous quartz ceramics, an internal force element and an outer sealing layer, made made of porous quartz ceramics with a polymer introduced into the pores (MFSS-8 oligomer) 1-2 mm thick, connected by a layer of sealant to Invar frame.

The disadvantages of the known construction include the fact that in the process of manufacturing a ceramic shell, it is first machined to a given wall and profile thickness depending on the dielectric constant of the material in the shell, and then it is impregnated to a depth of 1-2 mm with MFSS-8 oligomer and internal polymerization and the outer surfaces of the shell. In this case, there is a change in the dielectric constant of the impregnated material and, as a consequence, a change in the PTX of the shell. Fluctuations of structural factors in the thickness and height of the shell, as well as from shell to shell, do not provide a given depth of impregnation. All this leads to the need to mechanically modify the impregnated shells and re-impregnate them, which significantly complicates the process, while there are often cases when practically finished shells become defective by RTX.

The present invention is to simplify the design and manufacturing technology of the antenna fairing of porous ceramics.

This object is achieved by the fact that the proposed antenna cowl containing a radiolucent membrane of porous ceramic with a polymer introduced into the pores, connected by a sealant layer with a frame, characterized in that the radiolucent ceramic shell contains a polymer introduced into the pores throughout the volume.

The authors found that the implementation of a porous ceramic shell with polymer introduced into the pores throughout the volume substantially simplifies the design and manufacturing technology of the antenna cowl from porous ceramics. This is due to the fact that the shells completely impregnated with the polymer have a much better distribution of material properties over thickness and height than the shells impregnated with layers. This eliminates the need to ensure the thickness of the impregnated layers, as in the analogue, which greatly simplifies the technology.

It was experimentally established that a porous material completely impregnated with polymer throughout the entire volume of the shell has a water absorption of <0.1%, static bending strength of at least 60 MPa and can be used for a long time at temperatures from -60 to 400 ° C, for a short time at temperatures above 1200 ° With no degradation of its properties.

It was found that the porous shell material completely impregnated with the polymer can be subjected to mechanical processing without changing its properties, while the absorption of layers impregnated with porous ceramics often significantly increases water absorption during machining, which is caused by the uncontrolled impregnation depth presented in the analogue.

The manufacturing technology of antenna fairings according to the proposed technical solution includes the following operations:

- the manufacture of ceramic porous preforms by methods of ceramic production;

- machining the calcined workpiece with a diamond tool to a predetermined wall thickness and product profile;

- volumetric impregnation of the shell with a polymer, for example methylphenylspyrosiloxane (product MFSS-8), followed by polymerization;

- radio cladding of the shell by machining with a diamond tool to a predetermined wall and profile thickness depending on the radio technical characteristics of a particular shell in the entire range of operating frequencies;

- gluing the shell with the frame using sealant.

The implementation of the antenna fairing according to the proposed solution can significantly simplify the design of the antenna fairing made of porous ceramics and, as a result, simplify the technology of its production, which entails a reduction in the complexity and cost.

Information sources

1. RF patent No. 2209494, H01Q 1/42 dated 07/27/03.

2. RF patent No. 2256262, H01Q 1/42 dated 10.07.05.

Claims (1)

Antenna fairing containing a translucent shell of porous ceramic with a polymer introduced into the pores, connected by a sealant layer with a frame, characterized in that the radiolucent ceramic shell contains a polymer introduced into the pores throughout the volume.