High power density microwave radiation resistant coating for radome and preparation method thereof

Abstract

The invention discloses a high-power-density microwave radiation resistant coating for a radome. The high-power-density microwave radiation resistant coating can bear the microwave radiation with the power density of 17.6-80.0 W / cm<2>; the dielectric loss angle tangent value of the coating is from 3.7*10<-2> to 3.8*10<-2>; the coating is directly adhered to the surface of the radome; a preparation method of the coating comprises the following steps: firstly mixing epoxy resin, boron nitride powder, mineral powder, a solvent and an auxiliary according to a ratio, refining the mixture through a ball milling process to obtain a component A, mixing the component A with phenolic acid according to a ratio, coating the surface of the radome material with the mixed coating, and heating and curing the radome material coated with the coating, so as to obtain the high-power-density microwave radiation resistant coating. The high-power-density microwave radiation resistant coating disclosed by the invention is low in dielectric loss tangent value, stable in performance, simple in preparation, and low in cost.

Description

technical field [0001] The invention belongs to the field of functional coatings, in particular to a microwave radiation-resistant coating for a radome and a preparation method thereof. Background technique [0002] With the development of electronic countermeasures technology, the interference power is getting bigger and bigger. When applied to airborne equipment, the continuous transmission power of a single antenna reaches hundreds of watts or even kilowatts. According to the shape requirements of the aircraft, the transmitting antenna needs to be equipped with a rectenna cover. However, the radome is limited by the aerodynamic requirements of the carrier aircraft, and the degree of freedom in the design of the external dimensions is small, resulting in a small distance between the radome and the antenna, and the spatial attenuation of high-power microwaves is very small, so it is directly incident on the radome, inside the radome The power density is quite large. Accor...

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Problems solved by technology

When the temperature of the coating exceeds its service temperature, the resin in the coating will be carbonized, the color of the coating will turn yellow and become brittle, and in severe cases, the coating will fall off, which will affect the normal operation of the transmitting antenna

[0004] At present, general coatings mainly have defects such as chemical changes under high power density microwave radiation conditions, large dielectric loss tangent tgδ, and limited temperature resistance. These factors limit the application of coatings and make them unsuitable for airborne applications. use in environment

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