A kind of cobalt-containing composite wave-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: 2019-07-16
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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  • A kind of cobalt-containing composite wave-absorbing material and preparation method thereof
  • A kind of cobalt-containing composite wave-absorbing material and preparation method thereof
  • A kind of cobalt-containing composite wave-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, comprising the following steps:

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

[0039] (2) mixing the mixed feed liquid obtained in the step (1) with graphene oxide, and carrying out hydrothermal reaction to obtain a hydrothermal reaction feed liquid;

[0040] (3) removing the supernatant of the hydrothermal reaction feed liquid obtained in the step (2), and performing centrifugal washing and drying on the remaining feed liquid in sequence to obtain a composite wave-absorbing material.

[0041] The invention mixes ferric chloride, nanometer 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-cob...

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, wherein 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, the mixture was added to a polytetrafluoroethylene-lined autoclave, and kept at 50°C for 12 hours . After the obtained product was cooled, hydrogen peroxide (the mass fraction of hydrogen peroxide was 30%) was slowly added to it at a rate of 10 mL / min according to the mass ratio of the original graphite powder and hydrogen peroxide at 1:2, and the liquid turned bright yellow. The reacted mixed liquid is washed by distilled water for several times by centrifugation, and the supernatant is discarded after each washing, and then the remaining li...

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, wherein 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, the mixture was added to a polytetrafluoroethylene-lined autoclave, and kept at 60°C for 12 hours . After the obtained product was cooled, hydrogen peroxide (the mass fraction of hydrogen peroxide was 30%) was slowly added to it at a rate of 10 mL / min according to the mass ratio of the original graphite powder and hydrogen peroxide at 1:2, and the liquid turned bright yellow. The reacted mixed liquid is washed by distilled water for several times by centrifugation, and the supernatant is discarded after each washing, and then the remaining liq...

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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 has been paid more and more attention 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 radar wave scattering cross section. The key technology of radar stealth technology lies in the wave-absorbing properties of absorbing materials. The preparation of new and efficient absorbing materials with good performance has become an important research in the field of national defense and military affairs. topic. [0003] Graphene is light in weight, good i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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