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A broadband wave-absorbing load-bearing composite material and its preparation method

A composite, broadband technology

Active Publication Date: 2017-08-25
BEIJING RES INST OF MECHANICAL & ELECTRICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the radar wave absorber may redistribute with the resin flow during the curing process, resulting in instability of the electrical properties of the structural material
[0004] Zhu Hong et al. disclosed a broadband multilayer absorbing structure composite material and its preparation method (Chinese Patent Application No. 200810240990.0). Dispersed in the three-layer structure by coating, the prepared 2-18GHz frequency band has a good absorbing effect. The limitation of the process method used cannot overcome the situation that the absorbent layer flows with the resin in the layer and between the layers during the curing process, which leads to unstable electrical properties of the structural parts
The wave-absorbing performance of this type of material drops rapidly below 8GHz, and the low-frequency wave-absorbing performance is poor, and this type of material can only be pasted on the outer surface of the component / part by cementation. The bonding needs to be completed after the base material is formed, and the bonding process generally requires a special mold to pressurize to achieve a reliable connection, and the process is relatively complicated
[0006] At the same time, the common feature of the above-mentioned various materials is that the outermost layer is a continuous fiber reinforced composite material. This type of material is a solid structure, and its relative permittivity is generally above 3. Therefore, the incident radar wave has Strong echo reflection, which has a significant impact on the width of the absorbing frequency band
[0007] It can be seen that the existing wave-absorbing structural material uniform forming method has the disadvantages of narrow wave-absorbing frequency band and difficult control of the stability of wave-absorbing performance. Broad-band wave-absorbing load-bearing composite material with secondary curing process and preparation method thereof

Method used

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  • A broadband wave-absorbing load-bearing composite material and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0082] 2mm wave transparent foam + 0.4mm wave transparent layer + 0.4m electric loss absorbing layer + shielding bottom layer

[0083] Step 1: Preparation of Electric Loss Absorbing Cloth

[0084] Disperse the commercially available conductive carbon black material in the organic adhesive according to the required ratio, the mass ratio of carbon black to adhesive is 1:10, stir well, and configure the carbon black coating; use the spray gun to spray the carbon black coating evenly on the thickness of 0.2mm The surface of the wave-transparent fiber cloth, the deposition thickness of the carbon black material on the fiber cloth meets the design requirements by controlling the number of spraying times;

[0085] The above-mentioned fiber cloth is cured once, and the wave-absorbing cloth is obtained after drying.

[0086] Repeat the above steps to prepare electric loss absorbing cloths with different carbon black contents.

[0087] Step 2: Surface treatment of electric loss absorb...

Embodiment 2

[0092] 5mm wave transparent foam + 3mm wave transparent layer + 2mm electric loss absorbing layer + shielding bottom layer

[0093] Step 1: Preparation of Electric Loss Absorbing Cloth

[0094] Disperse the commercially available conductive carbon black material in the organic adhesive according to the required ratio, the mass ratio of carbon black and adhesive is 0.5:100\0.5:10\1:10, stir well, and configure it into a carbon black coating; use a spray gun to spray the carbon black The paint is evenly sprayed on the surface of the wave-transparent fiber cloth with a thickness of 0.2mm, and the deposition thickness of the carbon black material on the fiber cloth meets the design requirements by controlling the number of spraying times;

[0095] The above-mentioned fiber cloth is cured once, and the wave-absorbing cloth is obtained after drying.

[0096] Repeat the above steps to prepare electric loss absorbing cloths with different carbon black contents.

[0097] Step 2: Surf...

Embodiment 3

[0102] 15mm wave transparent foam + 5mm wave transparent layer + 5mm electric loss absorbing layer + shielding bottom layer

[0103] Step 1: Preparation of Electric Loss Absorbing Cloth

[0104] Disperse the commercially available conductive carbon black material in the organic adhesive according to the required ratio, the mass ratio of carbon black and adhesive is 0.5:100\0.5:10\1:10, stir well, and configure it into a carbon black coating; use a spray gun to spray the carbon black The paint is evenly sprayed on the surface of the wave-transparent fiber cloth with a thickness of 0.2mm, and the deposition thickness of the carbon black material on the fiber cloth meets the design requirements by controlling the number of spraying times;

[0105] The above-mentioned fiber cloth is cured once, and the wave-absorbing cloth is obtained after drying.

[0106] Repeat the above steps to prepare electric loss absorbing cloths with different carbon black contents.

[0107] Step 2: Sur...

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Abstract

The invention belongs to the technical field of manufacturing radar stealth materials for military aircrafts and particularly relates to a broadband wave-absorbing force bearing composite material adopting a secondary curing process and a preparing method thereof. The material is composed of a wave-transparent foam layer, a wave-transparent skin layer, an electrical loss wave-absorbing layer and a shielding bottom layer. The wave-transparent foam layer is made of an on-sale closed-hole hard organic foam material with the thickness of 2 mm-20 mm; the wave-transparent skin layer is made of a continuous wave-transparent fiber enhancing resin matrix composite material with the thickness of 0.1 mm-4 mm; the electrical loss wave-absorbing layer is made of a wave-transparent fiber cloth enhancing composite material which contains carbon black and is 0.5 mm-5 mm thick; the shielding bottom layer is made of a carbon fiber woven cloth material. According to the broadband wave-absorbing force bearing composite material adopting the second curing process, the wave-absorbing frequency band is wider, electrical performance is stable, and the composite material can be applied to various military targets and used for manufacturing stealth structural members with high broadband stealth performance.

Description

technical field [0001] The invention belongs to the technical field of radar stealth material manufacturing for weaponry, and relates to a broadband wave-absorbing load-bearing composite material and a preparation method thereof. Background technique [0002] The wave-absorbing laminate structure composite material is a kind of radar wave-absorbing structure material. The advantages of wave-absorbing laminate structure composite materials are small thickness increase and small weight increase, which are especially suitable for occasions with strict weight and size constraints such as skin materials for various military aircraft cabins. [0003] Taiwan Patent "Composite Material Absorbing Structure and Its Manufacturing Method in Thin Shell Form" (Patent No.: I258293) discloses a continuous fiber absorbing prepreg molding method that can be used for the preparation of multi-layer impedance gradient laminates. Its characteristics It is first to form a continuous fiber prepreg...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B9/04B32B27/04B32B27/12B32B33/00B32B37/02B32B37/15B32B38/18B32B37/12
CPCB32B5/02B32B5/18B32B5/26B32B7/12B32B9/007B32B9/047B32B17/02B32B33/00B32B37/02B32B37/12B32B37/153B32B38/18B32B2260/021B32B2260/046B32B2262/0223B32B2262/0261B32B2307/212
Inventor 张松靖丁铁伢郝璐王锦王瑞张磊
Owner BEIJING RES INST OF MECHANICAL & ELECTRICAL TECH
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