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A wave-absorbing/structure-integrated material composited with a metamaterial and a magnetic medium and a preparation method thereof

A magnetic medium and magnetic medium technology, applied in the field of absorbing materials, can solve the problems of large thickness and limited structure absorbing materials, etc.

Active Publication Date: 2022-03-01
BEIJING INST OF ENVIRONMENTAL FEATURES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Structural absorbing materials are the main technical means to achieve broadband absorbing. Usually, absorbers such as graphite and carbon black are combined with FRP or foam to form a structural form with certain mechanical strength. However, the conditions for structural absorbing materials to achieve broadband It has sufficient thickness, and sometimes this is not available in the system structure itself, which limits the application of structural absorbing materials to a certain extent
Combining metamaterials with low-dielectric media can reduce the thickness of broadband structural absorbing materials to a certain extent, but there is still the problem of large thickness

Method used

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  • A wave-absorbing/structure-integrated material composited with a metamaterial and a magnetic medium and a preparation method thereof
  • A wave-absorbing/structure-integrated material composited with a metamaterial and a magnetic medium and a preparation method thereof
  • A wave-absorbing/structure-integrated material composited with a metamaterial and a magnetic medium and a preparation method thereof

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Experimental program
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preparation example Construction

[0056] In a second aspect, the present invention provides a method for preparing a wave-absorbing / structure-integrated material composited with the metamaterial and a magnetic medium, comprising the following steps:

[0057] (1) Preparation of the first magnetic dielectric material film;

[0058] (2) Preparation of metamaterials;

[0059] (3) preparation of the second magnetic medium material film;

[0060] (4) Compounding: the first magnetic medium material film, the metamaterial, and the second magnetic medium material film are sequentially paved to a specified thickness, bonded, and cured to obtain the wave-absorbing / structure-integrated material.

[0061] Step (1): Step (1) is the step of preparing the first magnetic medium material film. The first magnetic medium material film can be prepared according to the following method: ball milling the first magnetic medium material and resin to obtain a first slurry; forming the first slurry into the first magnetic medium materia...

Embodiment 1

[0067] The composite absorbing material provided in this example has a three-layer structure. The first layer is carbonyl iron powder magnetic medium material with a thickness of 1.2mm, which is made of carbonyl iron powder magnetic medium film paving. The second layer is metamaterial with a thickness of 1.2 mm. The thickness is 0.13mm, and the third layer is ferrite magnetic medium material with a thickness of 3mm, which is made of ferrite magnetic medium film. Among them, the metamaterial is a periodic structure etched on the nano-silver coating film, and the periodic structural unit is a regular hexagon with a side length of 2.17 mm.

[0068] The preparation method comprises the following steps:

[0069] (1) Weigh 800g of carbonyl iron powder and put it into a mixing cup, add 200g of epoxy resin and 5g of dispersant, put it into a double planetary mixer and stir for 30min; put it into a ball mill for ball milling for 20min until the slurry is evenly dispersed and formed Ca...

Embodiment 2

[0075] The composite wave-absorbing material provided in this example has a three-layer structure. The first layer is carbonyl iron powder magnetic medium material with a thickness of 1.4 mm, which is made of carbonyl iron powder magnetic medium film paving. The second layer is metamaterial with a thickness of 1.4 mm. The thickness is 0.13mm, and the third layer is ferrite magnetic medium material with a thickness of 3.2mm, which is made of ferrite magnetic medium film. Among them, the metamaterial is a periodic structure etched on the nano-silver coating film, and the periodic structural unit is a regular hexagon with a side length of 2.17mm.

[0076] (1) Weigh 820g of carbonyl iron powder and put it into a mixing cup, add 180g of epoxy resin and 5g of dispersant, put it into a double planetary mixer and stir for 30min; put it into a ball mill for ball milling for 20min until the slurry is evenly dispersed and forms Carbonyl iron powder slurry. The carbonyl iron powder slurr...

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Abstract

The invention relates to a wave-absorbing / structure-integrated material combined with a metamaterial and a magnetic medium and a preparation method thereof. The material comprises in turn a first magnetic medium material layer comprising a first magnetic medium material; a metamaterial layer comprising a metamaterial, which is a periodic structure etched on a nano-silver coating film; comprising a second magnetic medium material The second magnetic medium material layer. A metamaterial with a certain impedance is formed by etching the nano-silver coating film with a certain impedance to form a periodic structure pattern, and then the metamaterial is used as the core layer and the upper and lower magnetic media are combined and integrated to form an ultra-broadband wave-absorbing / Structurally integrated materials, the composite material has a reflectivity of ≤-8dB at 2‑18GHz, and has polarization insensitivity.

Description

technical field [0001] The invention relates to the technical field of wave-absorbing materials, in particular to a wave-absorbing / structure-integrated material composed of metamaterials and magnetic media and a preparation method thereof. Background technique [0002] With the development of microwave detection technology, the system requires higher and higher broadband absorption performance of microwave absorbing materials. Traditional absorbing materials such as ferrite, carbonyl iron powder, metal micropowder, etc., can only have absorbing performance in a narrow frequency range. Structural absorbing materials are the main technical means to achieve broadband absorbing. Usually, absorbers such as graphite and carbon black are combined with FRP or foam to form a structural form with certain mechanical strength. However, the conditions for structural absorbing materials to achieve broadband It has sufficient thickness, and sometimes this is not available in the system st...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B7/12B32B27/08B32B27/28B32B33/00B32B37/12B32B38/00B32B38/16
CPCB32B27/08B32B27/281B32B7/12B32B33/00B32B37/1284B32B38/00B32B38/164B32B2260/025B32B2260/046B32B2250/24B32B2307/208B32B2307/20
Inventor 杨智慧张久霖孙新车永星姚石磊田江晓
Owner BEIJING INST OF ENVIRONMENTAL FEATURES