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Cobalt-containing composite absorbing material and preparation method thereof

A composite wave-absorbing material and material liquid technology, which is applied in the field of cobalt-containing composite wave-absorbing materials and their preparation, can solve the problems of limiting the application of graphene wave-absorbing materials and narrow graphene absorption frequency bandwidth

Active Publication Date: 2018-07-20
ARMOR ACADEMY OF CHINESE PEOPLES LIBERATION ARMY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the high dielectric constant also leads to the problem of narrow absorption band width of graphene, which limits the application of graphene absorbing materials.

Method used

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  • Cobalt-containing composite absorbing material and preparation method thereof
  • Cobalt-containing composite absorbing material and preparation method thereof
  • Cobalt-containing composite absorbing material and preparation method thereof

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preparation example Construction

[0037] The present invention also provides a preparation method of the composite wave absorbing material described in the above technical solution, which includes the following steps:

[0038] (1) Mixing ferric chloride, nano cobalt powder, surfactant, urea and ethylene glycol to obtain a mixed material liquid;

[0039] (2) Mix the mixed material liquid obtained in the step (1) with graphene oxide, and perform a hydrothermal reaction to obtain a hydrothermal reaction material liquid;

[0040] (3) Remove the supernatant of the hydrothermal reaction material liquid obtained in the step (2), and sequentially perform centrifugal washing and drying on the remaining material liquid to obtain a composite wave absorbing material.

[0041] The invention mixes ferric chloride, nano cobalt powder, surfactant, urea and ethylene glycol to obtain a mixed material liquid. In the present invention, the particle size of the nano cobalt powder is consistent with the particle size of the nano cobalt in ...

Embodiment 1

[0061] According to the mass ratio of 1:3:2:110:18, weigh graphite powder, potassium permanganate, sodium nitrate, concentrated sulfuric acid and orthophosphoric acid. Among them, the mass of concentrated sulfuric acid is crushed to 98%, and the mass concentration of orthophosphoric acid is 1.685g / mL; Then, after ultrasonically mixing graphite powder, potassium permanganate, sodium nitrate, concentrated sulfuric acid and orthophosphoric acid to homogeneity, add the mixture to a polytetrafluoroethylene-lined autoclave, and keep it at 50℃ for 12h. . After the obtained product is cooled, hydrogen peroxide is slowly added to it at a rate of 10 mL / min (the mass fraction of hydrogen peroxide is 30%) according to the mass ratio of original graphite powder and hydrogen peroxide 1:2, and the liquid turns bright yellow. The mixed liquid after the reaction was washed with distilled water several times by centrifugation, the supernatant was discarded after each washing, and the remaining ...

Embodiment 2

[0068] According to the mass ratio of 1:2:1:90:10, weigh graphite powder, potassium permanganate, sodium nitrate, concentrated sulfuric acid and orthophosphoric acid. Among them, the mass of concentrated sulfuric acid is crushed to 98%, and the mass concentration of orthophosphoric acid is 1.685g / mL; Then, after ultrasonically mixing graphite powder, potassium permanganate, sodium nitrate, concentrated sulfuric acid and orthophosphoric acid to homogeneity, add the mixed solution to a polytetrafluoroethylene-lined autoclave, and keep it at 60℃ for 12h. . After the obtained product is cooled, hydrogen peroxide is slowly added to it at a rate of 10 mL / min (the mass fraction of hydrogen peroxide is 30%) according to the mass ratio of original graphite powder and hydrogen peroxide 1:2, and the liquid turns bright yellow. The mixed liquid after the reaction was washed with distilled water several times by centrifugation, the supernatant was discarded after each washing, and the rema...

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Abstract

The invention provides a cobalt-containing composite absorbing material and a preparation method thereof. The composite absorbing material comprises a graphene oxide matrix, ferrite, nanometer cobaltand cobaltous carbonate, and the ferrite, the nanometer cobalt and the cobaltous carbonate are loaded on the surface of the graphene oxide matrix. Results of the embodiment show that according to theobtained composite absorbing material, when the matching thickness is 2.44 mm, the maximum absorption -19.13dB is achieved during 12.32 GHz, and the effective absorption frequency band whose reflection loss is lower than -10dB reaches 4.10 GHz; and when the matching thickness is 2.40 mm, the maximum absorption -17.36dB is achieved during 13.34 GHz, the effective absorption frequency band whose reflection loss is lower than -10dB reaches 2.74 GHz, the visible absorbing frequency band is substantially widened, and the absorbing capability is enhanced.

Description

Technical field [0001] The invention relates to the technical field of wave absorbing materials, in particular to a cobalt-containing composite wave absorbing material and a preparation method thereof. Background technique [0002] With the rapid development of weapon system search and tracking capabilities, stealth technology is increasingly being valued by the military of various countries. In order to meet the needs of modern warfare, stealth technology, as an emerging combat force, has been applied to weapons and equipment. As the core part of stealth technology, radar stealth technology can reduce the cross section of radar waves. The key technology of radar stealth technology lies in the absorbing properties of absorbing materials. New and efficient absorbing materials with good preparation performance have become an important research in the field of national defense and military. Subject. [0003] Graphene is light in weight, good in conductivity, has a high dielectric co...

Claims

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Application Information

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IPC IPC(8): H05K9/00C01B32/198C09K3/00
CPCC09K3/00H05K9/0081
Inventor 王玉江魏世丞梁义黄玉炜王博黄威郭蕾徐滨士
Owner ARMOR ACADEMY OF CHINESE PEOPLES LIBERATION ARMY
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