Microwave-absorbing composite material with discontinuous impedance gradient structure

A technology of composite materials and impedance gradual change, which is applied in the direction of layered products, chemical instruments and methods, coatings, etc., can solve the problems such as the effect is not obvious, and achieve the effect of good wave absorption ability, light weight, and strong electromagnetic wave loss ability

Active Publication Date: 2017-05-17
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

People have used many kinds of impedance gradient structures for different absorbents, but the effect is not very obvious

Method used

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  • Microwave-absorbing composite material with discontinuous impedance gradient structure
  • Microwave-absorbing composite material with discontinuous impedance gradient structure
  • Microwave-absorbing composite material with discontinuous impedance gradient structure

Examples

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Effect test

example 1

[0024] Use 4mm length, T700 type chopped carbon fiber as absorbent, two layers of electric loss layer chopped carbon fiber concentration ratio is 3:50, thickness ratio is 1:2, resin matrix is ​​epoxy resin, reinforced fiber cloth is QW220F, spraying The process distributes the chopped carbon fibers evenly on each layer of fiberglass cloth. The number of layers of fiber cloth used is 18, and the molding method is adopted, and the thickness of the formed composite material is 3.8mm. Schematic diagram of the structure of the absorbing composite material figure 1 , the absorbing performance curve is as follows figure 2 .

example 2

[0026] Use 4mm length, T700 type chopped carbon fiber as absorbent, two layers of electric loss layer chopped carbon fiber concentration ratio is 9:50, thickness ratio is 1:2, resin matrix is ​​epoxy resin, reinforced fiber cloth is QW220F, spraying The process distributes the chopped carbon fibers evenly on each layer of fiberglass cloth. The number of fiber cloth layers used is 20, and the compression molding method is adopted, and the thickness of the formed composite material is 4.0 mm. Schematic diagram of the structure of the absorbing composite material figure 1 , the absorbing performance curve is as follows image 3 .

example 3

[0028] Use 4mm length, T700 type chopped carbon fiber as absorbent, two layers of electric loss layer chopped carbon fiber concentration ratio is 3:60, thickness ratio is 1:2, resin matrix is ​​epoxy resin, reinforced fiber cloth is QW220F, spraying The process distributes the chopped carbon fibers evenly on each layer of fiberglass cloth. The number of fiber cloth layers used is 21, and the compression molding method is adopted, and the thickness of the formed composite material is 4.1mm. Schematic diagram of the structure of the absorbing composite material figure 1 , the absorbing performance curve is as follows Figure 4 .

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Abstract

The invention belongs to the field of composite material manufacturing and structure microwave-absorbing materials, and relates to a microwave-absorbing composite material with a discontinuous impedance gradient structure. A five-layer discontinuous impedance gradient structure comprising a wave-transparent layer, a low-concentration electrical loss layer, another wave-transparent layer and a high-concentration electrical loss layer and yet another wave-transparent layer is adopted; the used absorbent is electrical loss absorbent short carbon fibers; a mixed liquid is sprayed on quartz glass fiber cloth by adopting a spraying technology; and the short carbon fibers are uniformly distributed. An impedance gradient structure design is adopted by the electrical loss microwave-absorbing composite material, impedance matching can be achieved and an absorption band is effectively expanded. The short carbon fibers have the advantages of light weight, diversified loss mechanism and relatively high electromagnetic wave loss ability as an electrical loss absorbent, and the weight of the microwave-absorbing composite material is not increased. The designed and manufactured microwave-absorbing composite material has good micro-wave absorbing ability on X and KU bands.

Description

[0001] Technical field: [0002] The invention belongs to the field of composite material manufacturing and structural wave-absorbing materials, and relates to a wave-absorbing composite material with discontinuous impedance gradient structure. Background technique [0003] The microwave-absorbing composite material is mainly composed of absorbent, resin matrix, and reinforced fiber cloth. Absorbents mainly include electric loss absorbents and magnetic loss absorbents. The impedance matching problem of the electric loss absorbing material greatly affects the broadband of its absorbing performance, and the gradient structure of impedance gradient can effectively solve this problem. The impedance gradient structure includes a continuous impedance gradient structure and a discontinuous impedance gradient structure. People have used many kinds of impedance gradient structures for different absorbents, but the effect is not very obvious. Contents of the invention [0004] The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B17/02B32B17/06B32B17/12B32B33/00
CPCB32B5/02B32B5/26B32B33/00B32B2255/02B32B2255/26B32B2262/101B32B2262/106B32B2307/212
Inventor 程红飞黄大庆何山
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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