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Layered broadband radar wave-absorbing sheet and its preparation method

A broadband radar and wave plate technology, applied in metal layer products, chemical instruments and methods, synthetic resin layer products, etc., can solve the problem of poor wave absorption performance of sheet carbonyl iron and spherical ferrite. and other problems, to achieve the effect of large elongation at break, low surface density and strong adhesion

Active Publication Date: 2020-05-22
南京冠旭新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

0.5mm thick ferrite-based wave-absorbing sheet, in the frequency range of 1-18GHz, the reflectivity: [-0.5dB--2dB], the wave-absorbing performance is relatively poor
0.5mm-thick sheet-shaped Senus-Al-based wave-absorbing plate has good wave-absorbing performance at 1-4GHz, reflectivity: [-2dB--3dB], but poor wave-absorbing performance at other frequencies; 0.5mm-thick Flake carbonyl iron-based absorber, within the frequency range of 7-18GHz, reflectivity≤-5dB; spherical carbonyl iron-based absorber, within the frequency range of 8-18GHz, reflectivity≤-5dB; flake carbonyl iron in The absorption rate of S-band and C-band is better than that of spherical carbonyl iron, but the absorption performance of sheet carbonyl iron and spherical ferrite is poor in L-band

Method used

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  • Layered broadband radar wave-absorbing sheet and its preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] In this embodiment, the resin is EP-51 resin, the curing agent is diethylenetriamine or diethylenetriamine, and the solvent is xylene.

[0026] A layered broadband radar wave-absorbing sheet, which is a multi-layer wave-absorbing film, specifically five layers, with a total thickness of 0.5-0.52mm, from top to bottom: the first layer: spherical carbonyl iron film, with a thickness of 0.09mm~0.11mm; the second and third layers: flake carbonyl iron film, the thickness is 0.18mm~0.19mm; the fourth and fifth layers are flake silicon aluminum film, the thickness is 0.06mm~0.07 mm, the thickness of the fifth layer is 0.05mm~0.06mm.

[0027] The components and their proportions in the first layer are: the mass ratio of spherical carbonyl iron, resin and curing agent is 78:9:3; the components and their proportions in the second layer are: flake carbonyl iron, resin and curing agent The mass ratio of the agent is 80:17:3; the components and their proportions in the third layer ...

Embodiment 2

[0037] In this embodiment, for PE-51 resin, the curing agent is dimethylaminopropylamine, and the solvent is cyclohexanone.

[0038] A layered broadband radar wave-absorbing sheet, which is a multi-layer wave-absorbing film, specifically five layers, with a total thickness of 0.5-0.52mm, from top to bottom: the first layer: spherical carbonyl iron film, with a thickness of 0.09mm~0.11mm; the second and third layers: flake carbonyl iron film, the thickness is 0.18mm~0.19mm; the fourth and fifth layers are flake silicon aluminum film, the thickness is 0.06mm~0.07 mm, the thickness of the fifth layer is 0.05mm~0.06mm.

[0039] The components and their proportions in the first layer are: the mass ratio of spherical carbonyl iron, resin and curing agent is 92:7:1; in the second layer: the mass ratio of flake carbonyl iron, resin and curing agent is 88: 11:1; in the third layer: the mass ratio of flake carbonyl iron, resin and curing agent is 88:11:1; in the fourth layer: the mass ...

Embodiment 3

[0049] A layered broadband radar wave-absorbing sheet, which is a multi-layer wave-absorbing film, specifically five layers, with a total thickness of 0.52mm, from top to bottom: the first layer: spherical carbonyl iron film, with a thickness of 0.09mm ; The second and third layers: flaky iron carbonyl films, both with a thickness of 0.19mm; the fourth and fifth layers are flaky sendust films, with a thickness of 0.07mm, and the fifth layer with a thickness of 0.06mm.

[0050] Each layer is composed of magnetic medium powder, resin and curing agent.

[0051] The magnetic medium powder is the powder of flaky sendust or flaky carbonyl iron or spherical carbonyl iron.

[0052] The components and their proportions in the first layer are: the mass ratio of spherical carbonyl iron, resin and curing agent is 80:8:2; the components and their proportions in the second layer are: flake carbonyl iron, resin and curing agent The mass ratio of the agent is 85:15:2; the components and thei...

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Abstract

The invention discloses a layered broadband radar absorbing plate. The absorbing plate is a multilayer absorbing film. The multilayer absorbing film has five layers which are a first layer of a spherical carbonyl iron film, second and third layers of flaky carbonyl iron films, fourth and fifth layers of sheet Fe-Si-Al films from top to bottom in sequence. The invention also discloses a manufacturing method of the above-mentioned absorbing plate. The layered broadband radar absorbing plate of the present invention utilizes the principle of electromagnetic matching, the stress orientation technology, and the production technology of coating, rolling and vulcanization comprehensively. The finished product is characterized by high microwave absorption rate, a wide absorption frequency band, athin thickness, small surface density, high elongation at break, strong adhesion, high and low temperature resistance, flame retardance, easy usage, etc., and has wide application prospects in microwave stealth transformation of radar, communications equipment, satellite navigation, electrical equipment, notebooks, base stations, medical equipment and other electronic industries and weapons and equipment, and especially the stealth transformation of aerospace vehicles.

Description

technical field [0001] The invention relates to the technical field of radar absorbing materials, in particular to a layered broadband radar absorbing sheet and a preparation method thereof. Background technique [0002] With the rapid development of electronic technology, the detection frequency of spaceborne, airborne, shipborne, and vehicle-mounted radars is expanding to microwave low frequencies; electronic equipment, consumer electronics and other products are developing towards multi-function and miniaturization. Broadband radar absorbers have extremely important application value and broad market prospects in electromagnetic compatibility and radiation prevention of high-end electronic products, stealth transformation of weapons and equipment, etc. The wave-absorbing sheet has the characteristics of high absorption rate, flexibility, light weight, thin shape, and convenient use. It is currently the most widely used type of wave-absorbing material. The main materials ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01Q17/00B32B15/18B32B5/16B32B15/04B32B5/30B32B27/04B32B7/08B32B33/00B32B37/10B32B37/06B32B38/00
CPCB32B5/30B32B7/08B32B33/00B32B37/06B32B37/10B32B38/00B32B2038/0076B32B2260/025B32B2260/046B32B2260/048B32B2264/105B32B2307/306B32B2307/3065B32B2307/70H01Q17/00
Inventor 董斌李皓仝玉柱韩斌
Owner 南京冠旭新材料科技有限公司
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