Low-frequency radar wave absorbent and preparation method thereof

A low-frequency radar and wave absorption technology, used in antennas, electrical components, magnetic field/electric field shielding and other directions, can solve the problems of loss of magnetic loss performance, high distance resolution, affecting wave absorption performance, etc., to improve wave absorption performance, preparation Simple process and excellent electromagnetic performance

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

In particular, low-frequency radar waves have longer wavelengths, good low-altitude detection, and high distance resolution, which is more conducive to expanding the detection range of targets and providing early warning; at the same time, due to the low Curie temperature of existing radar wave absorbers , it is easy to lose the magnetic loss performance when applied in a high temperature environment, which affects its absorbing performance

Method used

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  • Low-frequency radar wave absorbent and preparation method thereof
  • Low-frequency radar wave absorbent and preparation method thereof
  • Low-frequency radar wave absorbent and preparation method thereof

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preparation example Construction

[0036] Such as figure 1 As shown, the invention provides a kind of preparation method of low-frequency radar wave absorber, and this preparation method comprises the steps:

[0037] (1) adding spherical iron-cobalt alloy micropowder, grinding aid and coating solution into a ball milling tank, and drying to obtain flaky iron-cobalt alloy micropowder coated with silicon dioxide after ball milling; wherein, the spherical iron-cobalt alloy The atomic ratio of iron and cobalt in the micropowder is 65:35;

[0038] (2) mixing the flaky iron-cobalt alloy micropowder and ferrocene to obtain a mixed powder;

[0039] (3) placing the mixed powder in an inert atmosphere to carry out chemical reaction and heat treatment in sequence to obtain the low-frequency radar wave absorber.

[0040] It should be noted that the spherical iron-cobalt alloy fine powder is the spherical Fe65Co35 alloy fine powder.

[0041] In the present invention, flake iron-cobalt alloy micropowder is used as a magne...

Embodiment 1

[0077] (1) Add spherical iron-cobalt alloy fine powder, grinding aid (calcium stearate) and coating liquid (tetraethyl silicate) with a mass ratio of 2000:2:9 into the ball mill jar, and grind at a speed of 800r After ball milling for 9 hours under the condition of / min, the solid product was obtained by drying, and the solid product was screened with a standard sieve of 44 μm (i.e. 325 mesh) to obtain flaky iron-cobalt alloy micropowder coated with silica (particle size≤ 44 μm); wherein, the atomic ratio of iron and cobalt in the spherical iron-cobalt alloy powder is 65:35;

[0078] Wherein, the ball milling medium in the ball milling process is absolute ethanol, the ball-to-material ratio is 4:1, and a diameter of 5 mm is selected for use as zirconia balls;

[0079] (2) Place the flaky iron-cobalt alloy micropowder and ferrocene obtained in step (1) in a V-type mixer, and mix for 2h under the condition that the feeding speed is 10r / min, to obtain a mixed powder; wherein, Th...

Embodiment 2

[0083] (1) Add spherical iron-cobalt alloy fine powder, grinding aid (calcium stearate) and coating solution (tetraethyl silicate) with a mass ratio of 1500:3:8 into the ball mill jar, and grind at a speed of 700r After ball milling under the condition of 7h / min, the solid product was obtained by drying, and the solid product was screened with a standard sieve of 44 μm (i.e. 325 mesh) to obtain flaky iron-cobalt alloy micropowder coated with silica (particle size≤ 44 μm); wherein, the atomic ratio of iron and cobalt in the spherical iron-cobalt alloy powder is 65:35;

[0084] Wherein, the ball milling medium in the ball milling process is absolute ethanol, the ball-to-material ratio is 4:1, and a diameter of 4 mm is selected for use as zirconia balls;

[0085] (2) Place the flaky iron-cobalt alloy micropowder and ferrocene obtained in step (1) in a V-type mixer, and mix for 2 hours under the condition that the feeding speed is 15r / min, to obtain a mixed powder; wherein, The m...

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Abstract

The invention particularly relates to a low-frequency radar wave absorbent and a preparation method thereof. The preparation method comprises the following steps: (1) adding spherical iron-cobalt alloy micro powder, a grinding aid and coating liquid into a ball milling tank, carrying out ball milling treatment, and drying to obtain silicon dioxide coated flaky iron-cobalt alloy micro powder; wherein the atomic ratio of iron to cobalt in the spherical iron-cobalt alloy micro powder is 65: 35; (2) mixing the flaky iron-cobalt alloy micro powder with ferrocene to obtain mixed powder; and (3) putting the mixed powder in an inert atmosphere, and sequentially carrying out chemical reaction and heat treatment to obtain the low-frequency radar wave absorbent. The low-frequency radar wave absorbent prepared by the invention has excellent wave absorbing performance in a radar wave frequency band of 1-2GHz.

Description

technical field [0001] The invention relates to the technical field of electromagnetic wave absorbing materials, in particular to a low-frequency radar wave absorber and a preparation method thereof. Background technique [0002] The absorbing material is a kind of energy that can absorb and attenuate the incident electromagnetic wave, and convert the electromagnetic wave energy into other forms of energy (such as mechanical energy, electrical energy and thermal energy) through the dielectric loss of the material and dissipate it, or make the electromagnetic wave due to interference. Cancellation of functional materials. The absorbing material is mainly composed of an absorber and a polymer matrix material, and the key to determine the absorbing performance is the absorber. [0003] With the maturity of detection and anti-detection technology in the 2-18GHz radar wave frequency band, various types of radar wave suppression materials have appeared at home and abroad to count...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/04B22F1/00C22C38/10H01Q17/00H05K9/00
CPCB22F9/04C22C38/10H05K9/0081H01Q17/00B22F2009/043Y02A90/10
Inventor 张久霖孙新贺军哲
Owner BEIJING INST OF ENVIRONMENTAL FEATURES
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