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Three-dimensional graphene-based composite wave absorbing materials, and preparation method thereof

A composite wave-absorbing material and graphene composite technology, applied in chemical instruments and methods, other chemical processes, etc., to achieve the effects of low wave-absorbing frequency band, adjustable electromagnetic parameters, and light specific gravity

Inactive Publication Date: 2018-12-04
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to literature research, there is no report on the preparation of three-dimensional graphene-based composite absorbing materials by high-temperature chemical foaming method

Method used

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  • Three-dimensional graphene-based composite wave absorbing materials, and preparation method thereof
  • Three-dimensional graphene-based composite wave absorbing materials, and preparation method thereof
  • Three-dimensional graphene-based composite wave absorbing materials, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Weigh ferric nitrate nonahydrate, cobalt nitrate hexahydrate and polyvinylpyrrolidone powder according to the mass ratio of 1.5:0.8:1, then dissolve in deionized water and stir ultrasonically for 10 minutes to obtain a mixed solution, and then place the mixed solution in a blast drying oven for 80 ℃ heat preservation until completely dry, then grind the dried product into powder and transfer the powder to a crucible, place the crucible in a tube furnace and heat it to 1000 ℃ at a heating rate of 5 ℃ / min in Ar atmosphere, keep After 2 hours, the black foamy product was collected after the tube furnace was cooled, and the magnetic nano-iron-cobalt alloy / three-dimensional graphene composite absorbing material was obtained.

Embodiment 2

[0032] Weigh ferric nitrate nonahydrate, (cobalt nitrate hexahydrate and nickel nitrate hexahydrate) and polyvinylpyrrolidone powder by mass ratio 1.5:1.0:1, wherein the raw material ratio 0.8 is the mass sum of cobalt nitrate hexahydrate and ferric nitrate hexahydrate Proportion; then dissolved in deionized water and ultrasonically stirred for 15 minutes to obtain a mixed solution, then placed the mixed solution in a blast drying oven at 80°C to keep warm until completely dry, then ground the dried product into a powder and transferred the powder to In the crucible, the crucible is placed in a tube furnace and heated to 1000 °C at a heating rate of 5 °C / min in an Ar atmosphere, and kept for 2 hours. After the tube furnace cools down, a black foamy product is collected to obtain a magnetic nano-iron-cobalt-nickel alloy / Three-dimensional graphene composite absorbing material.

Embodiment 3

[0034] The magnetic nano-iron-cobalt alloy / three-dimensional graphene composite wave-absorbing material prepared in Example 1 was uniformly mixed with sublimed sulfur at a mass ratio of 1:1, then placed in a tube furnace, and heated at a rate of 2°C / min in an Ar atmosphere. Heating at a rate of 300°C and keeping it warm for 3 hours, after the tube furnace is cooled to room temperature, the foamy product is collected, which is the magnetic nano cobalt iron sulfide / three-dimensional graphene composite wave-absorbing material.

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Abstract

The invention discloses three-dimensional graphene-based composite wave absorbing materials, and a preparation method thereof. The three-dimensional graphene-based composite wave absorbing materials are composite materials composed of magnetic nanometer iron-based compounds and three dimensional graphene; wherein uniform in-suit growth of the magnetic nanometer iron-based compounds in the three dimensional graphene lamellar structure is realized, the structure is stable, shedding is not easily caused. A series of different magnetic nanometer iron-based compound / three dimensional graphene composite wave absorbing materials can be prepared through controlling reaction conditions; the preparation method is novel; the production period is short; the cost is low; the repeatability is high; large scale production can be realized; important reference effect is provided for preparation of graphene-base composite wave absorbing materials. According to the preparation method, the magnetic nanometer iron-based compounds with high dielectric loss and magnetic loss and graphene high in resistive loss are combined, so that wide wave absorbing frequency range and high wave absorbing intensity areachieved, excellent wave absorbing performance at low frequency zone is achieved, and practical application requirements are satisfied.

Description

technical field [0001] The invention belongs to the field of electromagnetic wave absorbing materials, and in particular relates to a three-dimensional graphene-based composite wave absorbing material and a preparation method thereof. Background technique [0002] With the rapid development of electronic technology, TV broadcasting communication, microwave anechoic chamber, radar guidance and other technologies have been popularized and applied. As one of the effective means of reducing electromagnetic radiation, new absorbing materials have become a research hotspot in recent years. Regardless of the increasing demand for absorbing materials in the military or civilian fields, more and more attention has been paid to the application research on absorbing materials. As a new type of carbon material, graphene can meet the requirements of "thin, wide, light, and strong" new absorbing materials due to its special structure and properties, making it have a good application prosp...

Claims

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Application Information

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IPC IPC(8): C09K3/00
CPCC09K3/00
Inventor 李平韩坤刘颖赵汪曲选辉
Owner UNIV OF SCI & TECH BEIJING
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