Medium temperature frequency selective surface material and preparation method thereof

Abstract

The invention discloses a medium temperature frequency selective surface material. With a layered structure, the medium temperature frequency selective surface material comprises a base layer (quartz fiber reinforced polyimide resin matrix composite material), an intermediate medium layer (high temperature resistant polyimide film) and a metal frequency selective surface layer from the bottom up in order. The preparation method includes: coating a quartz fiber cloth with a polyimide solution to make a prepreg, and then making the prepreg into the base layer; preparing a layer of metal plating on the surface of a polyimide film, and then etching a frequency selective surface on the metal plating, thus obtaining the intermediate medium layer / metal frequency selective surface layer; and coating a polyimide adhesive to the base layer surface, then bonding the base layer and the intermediate medium layer / metal frequency selective surface layer into a whole by hot mould pressing technique, thus obtaining the medium temperature frequency selective surface material. The medium temperature frequency selective surface material provided by the invention has significantly improved temperature resistant grade, can tolerate 400DEG C-600DEG C in a short term, and has good heat resistance.

Description

technical field [0001] The invention relates to the field of aerospace materials, in particular to a medium-temperature frequency-selective surface material and a preparation method thereof. Background technique [0002] The radome is the basic facility to ensure the normal operation of the radar antenna system. It is not only a part of the missile body, but also a part of the radar guidance system. Fiber-reinforced resin-based composites have become the main material for radomes due to their advantages such as light weight, high specific strength / stiffness, resistance to aerodynamic heating, high processing precision, multi-functional integration, and controllable cost. Commonly used wave-transparent resin substrates are epoxy resin, phenolic resin, unsaturated polyester resin, and silicone resin. Epoxy resin is one of the most commonly used matrix resins, but its use temperature is too low; phenolic resin has good heat resistance, mechanical properties and environmental r...

AI Technical Summary

Problems solved by technology

However, as the flight speed of the new generation of aircraft increases, it will be in severe environments such as high-speed aerodynamic heating, loading, and raindrop impact during flight, requiring frequency-selective surface materials to withstand higher temperatures (greater than 400 ° C). Commonly used frequency selective surface materials are mainly used at room temperature, and there is a lack of 400-600°C medium-temperature resistant frequency selective surface materials and their preparation methods that are compatible with the integration of radar stealth and working frequency band wave-transmitting functions.

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