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A kind of lightweight broadband electromagnetic wave absorbing material and preparation method thereof

An electromagnetic wave-absorbing and broadband technology, which is applied in the field of light-weight broadband electromagnetic wave-absorbing materials and their preparation, can solve the problems of heavy weight and low interlayer shear strength, and achieve the effect of light weight, good mechanical properties, and thin thickness

Active Publication Date: 2020-06-23
AEROSPACE SCI & IND WUHAN MAGNETISM ELECTRON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the thickness of FRP absorbing material is usually thick, and due to the addition of a large amount of absorbing agent, its weight is heavy and the interlayer shear strength is low, which limits its mass application.

Method used

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  • A kind of lightweight broadband electromagnetic wave absorbing material and preparation method thereof
  • A kind of lightweight broadband electromagnetic wave absorbing material and preparation method thereof
  • A kind of lightweight broadband electromagnetic wave absorbing material and preparation method thereof

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preparation example Construction

[0034] This embodiment also provides a method for preparing the above-mentioned lightweight broadband electromagnetic absorbing material 100, which includes:

[0035] Step S1: Carve the conductive cloth with different conductivity into a plurality of repeatedly arranged "back"-shaped structural units 131, and then stack the carved conductive cloth to form the conductive cloth layer 130;

[0036]Step S2: Lay the Type I wave-absorbing coating and the Type II wave-absorbing coating on the glass fiber cloth respectively to obtain the Type I wave-absorbing cloth layer 121 and the Type II wave-absorbing cloth layer 122, and then add an epoxy film between them to cure to obtain the absorbing cloth layer. bob layer 120;

[0037] Step S3: sequentially curing the glass fiber cloth, the wave-absorbing cloth layer 120 and the conductive cloth layer 130 with an epoxy adhesive film.

Embodiment 1

[0040] This embodiment provides a lightweight broadband electromagnetic absorbing material, such as Figure 1 ~ Figure 3 As shown, its structural dimensions are as follows:

[0041] In each structural unit 131, the side length of the glass fiber cloth layer 110 and the wave-absorbing cloth layer 120 is A=4.2mm; the side length of the first conductive part 132 of the square ring is B=3.7mm, and the width is D=0.2mm; The side length of the second conductive portion 133 is C=3 mm; the gap between the first conductive portion 132 and the second conductive portion 133 is E=0.2.

[0042] The total thickness of the lightweight broadband electromagnetic absorbing material is H5=4mm, wherein the thickness of the glass fiber cloth layer 110 is H1=0.95mm; the thickness of the I-type wave-absorbing cloth layer 121 is H2=0.23mm; the II-type wave-absorbing cloth layer The thickness of 122 is H3=0.25mm; the thickness of conductive cloth layer 130 is H4=0.05mm.

[0043] Its preparation meth...

Embodiment 2

[0049] This embodiment provides a lightweight broadband electromagnetic absorbing material, such as Figure 1 ~ Figure 3 As shown, its structural dimensions are as follows:

[0050] In each structural unit 131, the side length of the glass fiber cloth layer 110 and the wave-absorbing cloth layer 120 is A=4.2mm; the side length of the first conductive part 132 of the square ring is B=3.7mm, and the width is D=0.2mm; The side length of the second conductive portion 133 is C=3 mm; the gap between the first conductive portion 132 and the second conductive portion 133 is E=0.2.

[0051] The total thickness of the lightweight broadband electromagnetic absorbing material is H5=4mm, wherein the thickness of the glass fiber cloth layer 110 is H1=0.95mm; the thickness of the I-type wave-absorbing cloth layer 121 is H2=0.20mm; the II-type wave-absorbing cloth layer The thickness of 122 is H3=0.25mm; the thickness of conductive cloth layer 130 is H4=0.05mm.

[0052] Its preparation meth...

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Abstract

The invention provides a lightweight and broadband electromagnetic wave absorbing material and a preparation method thereof, and relates to the field of electromagnetic wave absorbing materials. The lightweight and broadband electromagnetic wave absorbing material comprises a glass fiber cloth layer, a wave absorbing cloth layer and a conductive cloth layer which are sequentially cured by using epoxy adhesive films, wherein the conductive cloth layer comprises a plurality of repeatedly arranged double nested square-shaped structural units, each of which comprises a first conductive part and asecond conductive part. The preparation method comprises the following steps: carving conductive cloth with different conductivity into the plurality of repeatedly arranged double nested square-shapedstructural units, then stacking up the carved conductive cloth to form the conductive cloth layer; preparing the wave absorbing cloth layer; sequentially curing the glass fiber cloth layer, the waveabsorbing cloth layer and the conductive cloth layer by using the epoxy adhesive films. The lightweight and broadband electromagnetic wave absorbing material has the characteristics of low thickness,light weight and good mechanical properties, and has relatively strong wave absorption at 4-18GHz.

Description

technical field [0001] The invention relates to the field of electromagnetic wave absorbing materials, in particular to a lightweight broadband electromagnetic wave absorbing material and a preparation method thereof. Background technique [0002] With the rapid development of modern electronic technology, various new radar detectors have come out one after another, and the defense capabilities and anti-missile capabilities of countries in the world are increasing day by day, which makes the threats to large combat weapons such as aircraft and missiles increasingly intensified. As an effective means to improve the survivability and defense penetration capability of weapon systems, radar absorbing materials play a very prominent role and status in modern military stealth, and are the focus of research in modern countries in the world. [0003] FRP absorbing material is composed of multi-layer fiber cloth, resin and absorbing agent, which can realize low-frequency and broadban...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B17/02B32B17/12B32B7/12B32B33/00B32B37/12B32B37/24H05K9/00
CPCB32B5/02B32B5/26B32B7/12B32B17/067B32B33/00B32B37/12B32B37/24B32B2037/243B32B2255/02B32B2262/101B32B2307/20B32B2307/718B32B2571/00H05K9/0088
Inventor 王浩继王建国朱时霖
Owner AEROSPACE SCI & IND WUHAN MAGNETISM ELECTRON