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A high-efficiency wave absorbing agent for 2-18ghz frequency band and its preparation method

A wave absorbing agent and high-efficiency technology, applied in the field of wave absorbing materials, can solve the problems of unfavorable wave absorbing performance, reducing the magnetic loss of the system, destroying the impedance matching situation, etc., so as to improve the wave absorbing performance, enhance the dielectric loss, and have a good application background. Effect

Active Publication Date: 2020-10-16
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

And if Fe 3+ / Cu 2+ If the molar ratio is too small, the magnetic phase Fe in the system 3 o 4 If the content is too small, the magnetic loss of the system will be greatly reduced, and the impedance matching will be seriously damaged, which will not be conducive to the improvement of the wave-absorbing performance

Method used

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  • A high-efficiency wave absorbing agent for 2-18ghz frequency band and its preparation method
  • A high-efficiency wave absorbing agent for 2-18ghz frequency band and its preparation method
  • A high-efficiency wave absorbing agent for 2-18ghz frequency band and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1) Weigh 0.01mol ferric chloride and place it in a beaker, add 80ml of ethylene glycol into the beaker and stir for 10min, fully dissolve to obtain solution A;

[0021] 2) Add 7.2g of sodium acetate to solution A, and stir for 0.5h to obtain solution B;

[0022] 3) Put solution B into a 100ml reaction kettle, place it in an oven, and keep it warm at 200°C for 20 hours to finally obtain a layered solution;

[0023] 4) Pour off the supernatant, collect the black powder at the bottom of the reactor, wash it three times with deionized water and absolute ethanol, and dry it in a vacuum oven at 60°C for 6 hours to obtain pure Fe 3 o 4 powder.

[0024] The wave-absorbing performance of the 2-18GHz frequency band radar absorber prepared in this example is tested by the Agilent vector network analyzer coaxial line test method. During the test, the wave-absorbing material powder of the present invention and solid paraffin were uniformly mixed at 80°C in a mass ratio of 7:3 and...

Embodiment 2

[0027] 1) Weigh ferric chloride and copper chloride at a molar ratio of 2.9:0.1 and place them in a beaker, add 80ml of ethylene glycol into the beaker and stir for 10 minutes to fully dissolve to obtain solution A;

[0028] 2) Add 7.2g of sodium acetate to solution A, and stir for 0.5h to obtain solution B;

[0029] 3) Put solution B into a 100ml reaction kettle, place it in an oven, and keep it warm at 200°C for 20 hours to finally obtain a layered solution;

[0030]4) Pour off the supernatant, collect the black powder at the bottom of the reactor, wash it three times with deionized water and absolute ethanol, and dry it in a vacuum oven at 60°C for 6 hours to obtain Fe 3 o 4 / Cu powder.

[0031] The wave-absorbing performance of the 2-18GHz frequency band radar absorber prepared in this example is tested by the Agilent vector network analyzer coaxial line test method. During the test, the wave-absorbing material powder of the present invention and solid paraffin were uni...

Embodiment 3

[0034] 1) Weigh ferric chloride and copper chloride at a molar ratio of 2.7:0.3 and place them in a beaker, add 80ml of ethylene glycol into the beaker and stir for 10 minutes to fully dissolve to obtain solution A;

[0035] 2) Add 7.2g of sodium acetate to solution A, and stir for 0.5h to obtain solution B;

[0036] 3) Put solution B into a 100ml reaction kettle, place it in an oven, and keep it warm at 180°C for 24 hours to finally obtain a layered solution;

[0037] 4) Pour off the supernatant, collect the black powder at the bottom of the reactor, wash it three times with deionized water and absolute ethanol, and dry it in a vacuum oven at 60°C for 6 hours to obtain Fe 3 o 4 / Cu powder.

[0038] The wave-absorbing performance of the 2-18GHz frequency band radar absorber prepared in this example is tested by the Agilent vector network analyzer coaxial line test method. During the test, the wave-absorbing material powder of the present invention and solid paraffin were un...

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Abstract

The invention discloses an efficient absorbent for electromagnetic waves at 2-18GHz frequency bands and a preparation method thereof. The absorbent is a Fe3O4 / Cu compound with nanospheres and nanorodscoexisting, wherein n(Fe) / n(Cu)=27:7 to 27:3. By using the reducibility of ethylene glycol as a solvent, the Fe3O4 / Cu compound is formed in situ. By adjusting the molar ratio of Fe3+ / Cu2+, the content of an elementary substance (copper) in the compound is controlled. When the content of the elementary substance (copper) in the system reaches a certain level, nucleation and growth in a certain direction of crystalline grains are facilitated, the transformation of some nanospheres to the nanorods is promoted, and the nanospheres and the nanorods coexist. The nanospheres have large specific surface areas, and absorption of the electromagnetic waves can be enhanced by increasing the reflection in electromagnetic waves; the transmission of electrons is facilitated through the nanorods, and a conductive network is easily formed in the material to enhance dielectric loss. When the thickness of the absorbent is 0-2 mm, the strongest reflection loss RL can reach -53.43 dB, and meanwhile the maximum effective absorption bandwidth can reach 5.84 GHz. The bandwidth of the Fe3O4 / Cu composite absorbent with the nanospheres and the nanorods coexisting is superior to that of most of current Fe3O4based composites.

Description

technical field [0001] The invention belongs to the technical field of wave-absorbing materials, and in particular relates to a high-efficiency wave-absorbing agent for 2-18 GHz frequency band and a preparation method thereof. Background technique [0002] With the rapid development of today's electromagnetic wave technology, electronic equipment is ubiquitous in people's lives, bringing a lot of electromagnetic interference and pollution, which seriously threatens people's health; and in the military, modern warfare is an information war. Occupying a favorable position in the war, it is imminent to improve the stealth technology of weapons and equipment. At present, the centimeter wave 2-18GHz is the most used. Therefore, it is a very important task to develop a "thin, light, wide, and strong" high-efficiency wave absorber in this wave band. [0003] Fe 3 o 4 It has an inverse spinel structure and is ferrimagnetic. It is widely used in absorbing materials due to its high...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K3/00H05K9/00C01G49/08B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01G49/08C01P2004/16C01P2004/32C01P2004/80C09K3/00H05K9/0081
Inventor 刘初阳方罡杨赟彭康森张艳婷
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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