Preparation method of graphene composite wave absorbing material based on 5G communication and application of graphene composite wave absorbing material

A graphene composite and wave-absorbing material technology is applied in the field of wave-absorbing materials, which can solve the problems that wave-absorbing materials cannot be satisfied, carbonyl iron powder has high density, poor temperature stability, etc., and achieves good absorption performance, light surface density, and wave absorption. thin coating effect

Inactive Publication Date: 2018-11-23
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, carbonyl iron powder has high density, poor temperature stability, and narrow absorption frequency band, which cannot meet the requirements of "thin, light, wide, and strong" absorbing materials, thus limiting its practical application in absorbing materials.

Method used

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  • Preparation method of graphene composite wave absorbing material based on 5G communication and application of graphene composite wave absorbing material
  • Preparation method of graphene composite wave absorbing material based on 5G communication and application of graphene composite wave absorbing material
  • Preparation method of graphene composite wave absorbing material based on 5G communication and application of graphene composite wave absorbing material

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Embodiment 1

[0042] A preparation method of a graphene composite wave-absorbing material based on the full-band of future 5G mobile communication is as follows:

[0043] First, preheat the raw material of carbonyl iron powder, preheat the raw material under the protection of argon at 100°C for 2 hours; mix 4.9g of carbonyl iron powder raw material and bearing steel balls according to the mass ratio of material ball 1:10 Put it into a ball mill jar, wherein the bearing steel balls are composed of small balls with a diameter of 6mm and middle balls with a diameter of 8mm. The mass ratio of the small balls to the middle balls is 1:1. Add 0.1g graphene oxide, 0.01g Calcium stearate, and add 50mL of absolute ethanol to immerse the raw material, stir evenly with a glass rod, and then seal it into a pendulum ball mill for ball milling. The ball milling time is 1 hour. The ball milling changes the shape of the spherical carbonyl iron powder to have a certain Flaky particles with aspect ratio, and ...

Embodiment 2

[0046] A preparation method of a graphene composite wave-absorbing material based on the full-band of future 5G mobile communication is as follows:

[0047] First, preheat the raw material of carbonyl iron powder, preheat the raw material under the protection of argon at 100°C for 2 hours; mix 4.9g of carbonyl iron powder raw material and bearing steel balls according to the mass ratio of material ball 1:10 Put it into a ball mill jar, wherein the bearing steel balls are composed of small balls with a diameter of 6mm and middle balls with a diameter of 8mm. The mass ratio of the small balls to the middle balls is 1:1. Add 0.1g graphene oxide, 0.01g Calcium stearate, and add 50mL of absolute ethanol to immerse the raw material, stir evenly with a glass rod, and then seal it into a pendulum ball mill for ball milling. The ball milling time is 2 hours. The ball milling changes the shape of the spherical carbonyl iron powder to have a certain Flaky particles with aspect ratio, and b...

Embodiment 3

[0050] A preparation method of a graphene composite wave-absorbing material based on the full-band of future 5G mobile communication is as follows:

[0051] First, preheat the raw material of carbonyl iron powder, preheat the raw material under the protection of argon at 100°C for 2 hours; mix 4.9g of carbonyl iron powder raw material and bearing steel balls according to the mass ratio of material ball 1:10 Put it into a ball mill jar, wherein the bearing steel balls are composed of small balls with a diameter of 6mm and a middle ball with a diameter of 8mm. The mass ratio of the small balls to the middle balls is 1:1. Add 0.1g graphene oxide, 0.1g Calcium stearate, and add 50mL of absolute ethanol to immerse the raw material, stir evenly with a glass rod, and then seal it into a pendulum ball mill for ball milling. The ball milling time is 1 hour. The ball milling changes the shape of the spherical carbonyl iron powder to have a certain Flaky particles with aspect ratio, and ...

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Abstract

The invention discloses a preparation method of a graphene composite wave absorbing material based on 5G communication and application of the graphene composite wave absorbing material. According to the preparation method disclosed by the invention, a flake graphene composite wave absorbing material with an excellent impedance matching property is obtained by a mixture of mechanical ball-milling carbonyl iron powder and graphene oxide. In the 2 to 18GHz frequency range, when the coating thickness is 1mm, a reflection loss peak value of the graphene composite wave absorbing material reaches -5.8dB near 5GHz, and the effective frequency width of absorption in which RL is smaller than -4.0dB reaches 5GHz (3.2 to 8.2GHz) fully covers the future China Mobile 5G full-band (3.3 to 3.6GHz and 4.8to 5.0GHz) released by the Ministry of Industry and Information Technology. In addition, the position of an absorption peak of the graphene composite wave absorbing material can be changed by adjusting the ball-milling time and the content of calcium stearate, so that the aim of selectively absorbing interference noises in any two frequency bands in the future 5G is achieved.

Description

technical field [0001] The invention relates to a preparation method and application of a graphene composite wave-absorbing material based on 5G communication, and belongs to the technical field of wave-absorbing materials. Background technique [0002] In recent years, electromagnetic waves have been widely used in many fields such as household appliances, communications, and personal digital assistants. While facilitating people's lives, serious problems of radio wave radiation and pollution have also emerged. Nowadays, with the rapid development of mobile communication, the Ministry of Industry and Information Technology of my country has released the frequency use plan for the 5G system in the 3000-5000MHz frequency band. In the near future, 5G mobile communication will open a new door for us, but various high-intensity electromagnetic radiation will force 5G communication to spread in an environment full of electromagnetic radiation pollution. This kind of electromagne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K3/00
CPCC09K3/00
Inventor 洪起虎燕绍九陈翔李秀辉王晨
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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