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Passive frequency control material based on graphene/ferrite and preparation method of passive frequency control material

A graphene and ferrite technology, applied in the field of wave absorbing materials, can solve problems such as no articles and reports, and achieve the effects of reliable performance, convenient operation and simple preparation process

Active Publication Date: 2018-07-20
BEIJING INST OF ENVIRONMENTAL FEATURES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are very few studies on passive frequency control materials with wave-absorbing / wave-transmitting integration, and no related articles and reports have been seen.

Method used

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  • Passive frequency control material based on graphene/ferrite and preparation method of passive frequency control material
  • Passive frequency control material based on graphene/ferrite and preparation method of passive frequency control material
  • Passive frequency control material based on graphene/ferrite and preparation method of passive frequency control material

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preparation example Construction

[0052] The invention provides a preparation method of a graphene / ferrite-based passive frequency control material, the preparation method comprising the following steps: (1) preparing a graphene solution by using a redox process.

[0053] The preparation methods of graphene mainly include micromechanical exfoliation method, chemical vapor deposition method, crystal epitaxy orientation growth method, liquid phase exfoliation method, graphite oxide reduction method, etc. The advantage of the micromechanical exfoliation method is that it is simple and not easy to produce structural defects, but the output is too low, the area is too small, it is difficult to accurately control, the efficiency is low, and it is difficult to achieve large-scale preparation; And the vacuum conditions are high, the thickness of the graphene film using this method is often uneven, and the graphene is tightly adhered to the substrate, which greatly affects the performance of the graphene. Chemical vapor ...

Embodiment 1

[0070] S1, prepare graphene solution, comprise the steps:

[0071] S11, 30g natural flake graphite, 10g NaNO 3 Add it to 500mL of concentrated sulfuric acid with a concentration of 18mol / L, put it in an ice-water bath, stir for 30min, and make it fully mixed;

[0072] S12, weigh 70g KMnO 4 Add to the mixed solution in S11, stir for 2h;

[0073] S13. The temperature of the solution obtained in S12 is raised to 30° C., and the stirring is continued for 30 minutes;

[0074] S14. Slowly add 100 mL of distilled water to the solution obtained in S13, raise the temperature to 95° C., and stir for 30 min;

[0075] S15, adding 40mL of 30% H to the mixed solution obtained in S14 2 o 2 Stir continuously for 2 hours, dilute with 100mL distilled water, and filter at 90°C;

[0076] S16. Wash the solution of S15 with a 5% concentration of dilute hydrochloric acid solution and distilled water until there are no sulfate groups, and add 100 mL of distilled water for ultrasonic dispersion ...

Embodiment 2

[0103] The preparation method is basically the same as Example 1, except that:

[0104] In S4, balls with a diameter of 3 mm were used, the ball-to-material ratio was 6:1, the speed of the ball mill was 700 r / min, and the ball milled for 4 hours.

[0105] The reflectance of the material prepared in this embodiment is detected, and it is known that the reflectance of the material in the wide frequency range of 2 GHz to 18 GHz can reach -15 dB at least, and has very good absorbing performance. In the frequency range of 15GHz to 17GHz, the maximum wave transmission rate can reach -0.4dB, which has very good wave transmission performance.

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Abstract

The invention relates to a passive frequency control material based on graphene / ferrite and a preparation method of the passive frequency control material. The preparation method comprises the following steps: preparing a graphene solution by adopting an oxidization and reduction technology; preparing hexagonal crystal system nickel-zinc ferrite by adopting a chemical co-precipitation method; mixing the graphene solution, gamma-glycidoxypropyltrimethoxysilane and an organic solvent, and carrying out ultrasonic dispersion and vacuum drying to obtain functionalized modified graphene; mixing thefunctionalized modified graphene, the nickel-zinc ferrite and a ball milling auxiliary agent, and carrying out ball milling to obtain sediment; drying the sediment in vacuum to obtain ball-milled powder; mixing the ball-milled powder, fluororubber and a mixing auxiliary agent to obtain mixed rubber; vulcanizing the mixed rubber to obtain the passive frequency control material based on the graphene / ferrite. The material provided by the invention penetrates through electromagnetic waves at a working frequency band of a radar antenna and absorbs the electromagnetic waves at a frequency band needing to be hidden; the hiding of guided missiles, missile guiders of fighters or communication windows can be realized; the passive frequency control material has important military value and strategicsignificance.

Description

technical field [0001] The invention relates to the technical field of wave-absorbing materials, in particular to a graphene / ferrite-based passive frequency control material and a preparation method thereof. Background technique [0002] Weapon systems such as missiles and fighter planes are generally equipped with active radar antennas in order to meet precise tracking and strike requirements. However, from the perspective of stealth technology, due to the specular reflection or cavity effect of electromagnetic waves, radar antennas are often the main contributors to large RCS (radar cross section). The RCS of the terminal guidance radar antenna in the nose cone area of ​​a typical tactical missile is as high as 10dBsm, and the RCS of the plate slot antenna array commonly used for pulse Doppler radars can be as high as 30dBsm or more. If no measures are taken, it will be difficult to achieve the stealth technical indicators of the entire missile or fighter. But for antenn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/30
CPCC04B35/2658C04B2235/425C04B2235/96
Inventor 杨智慧孙新张久霖巢增明于海涛
Owner BEIJING INST OF ENVIRONMENTAL FEATURES
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