Radar echo attenuation composite material and preparation method thereof

Abstract

The invention provides a radar echo attenuation composite material, which is composed of a wave-transmitting layer, an absorbing layer and a shielding layer from outside to inside, wherein the wave-transmitting layer is a continuous wave-transmitting fiber reinforced composite material, the absorbing layer is continuous wave-transmitting fiber cloth, a polymer resin adhesive and a radar wave absorbent, and the shielding layer is a carbon fiber reinforced composite material or a metal material. The invention also provides a preparation method of the composite material, which comprises the following steps: dispersing the radar wave absorbent in the polymer resin, coating the wave-transparent fiber cloth with the radar wave absorbent, flattening the fiber cloth and mounting the fiber cloth ona mold, and curing the polymer resin to form the radar wave absorbing cloth; cutting the radar wave absorbing cloth into strips, weaving the strips, and coating the surface with a glue solution to prepare an absorbing layer material is prepared; successively laying the wave-transparent fiber cloth, the absorbing layer material and the shielding material in a mold, and curing polymer resin to formthe radar echo attenuation composite material. The radar echo attenuation composite material has the advantages of excellent electrical properties and stable mechanical properties.

Description

technical field [0001] The invention belongs to the technical field of high electromagnetic loss composite materials, and in particular relates to a radar echo attenuation composite material and a preparation method thereof. Background technique [0002] Radar echo attenuation composite materials are mainly used in the field of military technology, and such materials are generally used on the outer surface of weapons and equipment. Through the loss of the enemy's incident radar wave, the effect of radar echo attenuation is realized. [0003] There are two main types of existing technologies. One is to apply high electromagnetic loss coating materials on the outer surface of the target to achieve loss absorption of incident electromagnetic waves. The absorption frequency band of this method is narrow, which is difficult to meet the requirements of battlefield applications; the other is It is realized by applying fiber-reinforced composite materials and doping a certain amoun...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the wave-absorbing cloth that is cured once has great toughness, and the glue penetration and air permeability are very poor. Defects such as fiber cloth warping, local glue accumulation, and local bubble accumulation appear, and the electrical properties of the product are easy to fluctuate, and bring important defects to the structural mechanical properties, which is not conducive to mass production

[0006] To sum up, in the prior art, there are mainly the following two defects. One is that during the curing and molding process of composite materials, solid absorbent particles redistribute within the material along with the flow of resin, resulting in unstable electrical properties.

The second is the existing curing process that uses wave-absorbing cloth as an intermediate carrier. Because the wave-absorbing cloth contains cured resin material components, the hardness of the wave-absorbing cloth is relatively high, and the fiber cloth is difficult to bend, which seriously affects the manufacturability of the fiber cloth layer. , and the cured resin layer is impermeable to the glue, making the absorbing cloth prone to the lack of interlayer glue and air holes, resulting in unstable electrical and mechanical properties