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Oriented honeycomb wave-absorbing material and preparation method thereof

A technology of wave-absorbing materials and honeycomb materials, which is applied in antennas, electrical components, magnetic field/electric field shielding, etc., can solve problems such as unsuitable honeycomb materials, achieve easy control of wave-absorbing performance, good absorption effect, and improve wave-absorbing frequency bands Effect

Active Publication Date: 2022-02-18
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing mechanical orientation methods such as scraping coating are not suitable for honeycomb materials. How to prepare honeycomb absorbing materials with good P-band absorbing performance is a difficult problem to be solved by those skilled in the art.

Method used

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  • Oriented honeycomb wave-absorbing material and preparation method thereof
  • Oriented honeycomb wave-absorbing material and preparation method thereof
  • Oriented honeycomb wave-absorbing material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] In this embodiment, aramid honeycomb material with a cell side length of 2.75 mm (the thickness of the flat plate is 20 mm), and flake sendust powder (with a particle size of 50 μm and a thickness of about 1 μm, the contents of each element are: silicon 9.0 to 10.0 wt%, aluminum 5.0~6.0wt%, iron balance) and water-based acrylic resin as the main raw materials, the specific preparation methods include:

[0042] (1) Preparation of magnetic absorbent slurry: Add 100 parts of sendust powder to 62.5 parts of water-based acrylic resin, add 112.5 parts of water and 1 part of dispersing thickener to adjust the viscosity of the slurry; use a disperser to disperse , the rotating speed is set to 1000rpm, and dispersed for 1h to prepare sendust magnetic wave-absorbing slurry;

[0043] (2) Honeycomb impregnation: Place the honeycomb base material horizontally in the wave-absorbing slurry, lift it up after the slurry is completely submerged, turn the honeycomb over and impregnate it ...

Embodiment 2

[0048] In this embodiment, aramid honeycomb material with a cell side length of 2.75 mm (the thickness of the flat plate is 20 mm), and flake sendust powder (with a particle size of 50 μm and a thickness of about 1 μm, the contents of each element are: silicon 9.0 to 10.0 wt%, aluminum 5.0~6.0wt%, iron balance) and water-based acrylic resin as the main raw materials, the specific preparation methods include:

[0049] (1) Preparation of magnetic absorbent slurry: Add 100 parts of sendust powder to 210 parts of water-based acrylic resin, add 100 parts of water and 1 part of dispersing thickener to adjust the viscosity of the slurry; use a disperser to disperse, Set the rotation speed to 1000rpm, disperse for 1h, and prepare sendust magnetic wave-absorbing slurry;

[0050] (2) Honeycomb impregnation: Place the honeycomb base material horizontally in the wave-absorbing slurry, lift it up after the slurry is completely submerged, turn the honeycomb over and impregnate it again; pla...

Embodiment 3

[0055] In this embodiment, the aramid honeycomb material with a cell side length of 2.75mm (the thickness of the plate is 20mm), carbonyl iron powder and water-based acrylic resin are used as the main raw materials. The specific preparation methods include:

[0056] (1) Preparation of magnetic absorbent slurry: Add 100 parts of iron powder to 62.5 parts of water-based acrylic resin, add 112.5 parts of water and 1 part of dispersive thickener to adjust the viscosity of the slurry; Set at 1000rpm, disperse for 1h, and prepare ferromagnetic wave-absorbing slurry;

[0057] (2) Honeycomb impregnation: Place the honeycomb base material horizontally in the wave-absorbing slurry, lift it up after the slurry is completely submerged, turn the honeycomb over and impregnate it again; place the honeycomb in another clean container, and remove it by vibration control. Excess paint, once on the front and back;

[0058] (3) Orientation of the honeycomb absorbing material: place the honeycomb...

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Abstract

The invention discloses an oriented honeycomb wave-absorbing material and a preparation method thereof, and belongs to the technical field of electromagnetic wave functional materials. The preparation method comprises the following steps: (1) dipping treatment of a honeycomb base material: dipping the honeycomb base material in magnetic absorbent slurry to obtain a honeycomb material coated with a magnetic wave-absorbing coating; and (2) orientation and molding of the honeycomb material: rotating the honeycomb material coated with the magnetic wave-absorbing coating in a magnetic field for 6-12 hours, and then heating and curing to obtain the oriented honeycomb wave-absorbing material. An impregnation method and a magnetic field induction method are combined, on the basis of an existing honeycomb structure wave-absorbing material, the spatial arrangement of the absorbent on the honeycomb wall is changed by applying a magnetic field, the orientation degree of the absorbent is improved, the obtained honeycomb material has remarkably improved magnetic loss, and especially in a P frequency band, and the low-frequency absorption performance of the wave-absorbing material is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic functional materials, and in particular relates to an orientation honeycomb wave-absorbing material and a preparation method thereof. Background technique [0002] The frequency of the P-band electromagnetic wave is 0.3-1GHz, and the wavelength spans the scale of meters and decimeters. It is the main working frequency band of long-range early warning radars. serious challenge. In order to reduce the detectability of low-frequency and long-wave radars to aircraft, the development of advanced and efficient low-frequency radar absorbing materials has become a key research direction in the field of microwave absorption. [0003] Honeycomb absorbing materials have the advantages of light weight, wide frequency band, high absorption efficiency, high specific strength and specific stiffness, strong designability, impact resistance, good high temperature stability and dielectric properties, and a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q17/00H05K9/00
CPCH01Q17/00H05K9/0081
Inventor 陈乐顾兆栴王金平孙惠敏
Owner NANJING UNIV
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