High-temperature-resistant frequency selective surface antenna cover and preparation method thereof

Abstract

The invention provides a high-temperature-resistant frequency selective surface antenna cover and a preparation method thereof, a layered structure is adopted, the antenna cover is composed of a bearing layer, at least one layer of FSS (frequency selective surface) structural layer and an anti-ablation/washing layer, the bearing layer and the anti-ablation/washing layer are a plurality of layers of 2D and/or 2.5D fabric reinforced silicon dioxide-based ceramic materials, and the FSS structural layer, the bearing layer and the anti-ablation/washing layer are integrally formed by adopting a gluedipping-gel technology. According to the antenna cover and the preparation method in the invention, a single-layer or multi-layer FSS structure is prepared inside the fiber-reinforced silicon dioxide-based ceramic material, the FSS structure is stable, the FSS structure is good in environmental adaptability under the protection of the fiber-reinforced silicon dioxide-based ceramic material, the application field is wider, and engineering application of the technology is facilitated.

Description

technical field [0001] The invention relates to a high-temperature-resistant frequency-selective surface radome and a preparation method thereof, belonging to the technical field of radome preparation. Background technique [0002] Radome, antenna window and other wave-transparent components are not only an important part of the main structure of the aircraft, but also an important part of the antenna and communication system, which can protect the antenna system from the harsh aerodynamic environment caused by high-speed flight and carry out signal transmission normally. It is a multifunctional component integrating wave penetration, heat protection, load bearing and corrosion resistance. In recent years, antenna systems have continuously improved performance requirements for omnidirectional wave transmission, broadband wave transmission, frequency selective wave transmission, and stealth. Simple half-wave wall structures or sandwich structures have been difficult to meet t...

AI Technical Summary

Problems solved by technology

However, this technology has the following obvious deficiencies: 1) The porous silicon nitride ceramic material used as the substrate has poor thermal shock resistance, high brittleness, poor reliability, and is difficult to meet the requirements of high-state aircraft radome; 2) conductive ceramics and high temperature resistance The high-temperature oxidation resistance of metals is poor, and when used in a high-temperature and oxygen-enriched environment, the conductivity will decrease due to oxidation, which will affect the performance of FSS; 3) The technical solution disclosed in the literature does not treat the surface of the porous silicon nitride substrate, and the porous The substrate may cause capillary diffusion of conductive ceramic or metal paste, and the accuracy and electrical properties of the periodic pattern cannot be effectively guaranteed

The disadvantages of this technology are: 1) The preparation process is cumbersome. First, the modified adhesive layer must be prepared by multiple processes such as sandblasting, plasma spraying, and grinding, and the FSS structural layer must also be prepared by laser processing; 2) The substrate and New substances other than metals - modifying the bonding layer substances, which increases the complexity of the electrical structure design; 3) The preparation process of the FSS structure depends on technologies such as equal particle spraying, magnetron sputtering, and laser processing, and the degree of dependence on equipment 4) The FSS structure can only be prepared on the surface of the composite material, and the FSS structure has poor maintenance performance and poor environmental adaptability, which is not conducive to the engineering application of the technology

However, in terms of ceramic matrix composite materials, phosphate-based composite materials and alumina (mullite)-based composite materials that can be used in prepreg hand lay-up process are better in manufacturability, but their high and low temperature dielectric properties are unstable, and their dielectric loss Significant changes occur above 500°C and 650°C respectively, which limits the high-temperature application of the material; and the generally poor adhesion of the silica and nitride matrix determines that almost all silica, nitride-based composite materials are It is necessary to choose 2.5D, 3D overall weaving or stitching and needle-punched fabrics that use fibers to improve the interlayer strength of cloth layers as reinforcements to prepare composite materials and their components

[0009] If the existing sol-gel process is used to prepare fiber-reinforced silica-based wave-transparent composite materials that meet the prepreg hand lay-up process, the interlayer strength only depends on the weak bonding effect of the silica matrix, and the material is prone to decomposition. The layer is unstable, and the product strength is difficult to meet the requirements of the radome

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