5G-based high-performance electromagnetic shielding material and preparation method thereof

An electromagnetic shielding material, high-performance technology

Pending Publication Date: 2020-11-03
SUZHOU HONGJIU AVIATION THERMAL MATERIALS TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] At present, it is difficult to meet the requirements of wide frequency bandwidth, thin thickness and good shielding for the single use of the above-mentioned materials. Wave absorption and strong wave absorption become possible

Method used

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Examples

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Embodiment

[0022] A high-performance electromagnetic shielding material based on 5G with a volume density of less than 2.5g / cm 3 , composed of three-dimensional network foam carbon, silicon carbide nanowires, graphene, and resin. It is characterized in that silicon carbide nanowires are grown in situ inside the carbon foam, graphene is uniformly dispersed in the resin, and the resin containing graphene is filled inside the carbon foam reinforced by the silicon carbide nanowires.

[0023] The foamed carbon is obtained by pyrolysis of organic foam, the interior is a three-dimensional network structure, the cross-section of the cell wall is circular, the porosity is 70%, the pore diameter is 50 μm and the distribution is uniform, the conductivity is 0.46S / cm, and the reflection loss reaches - 15dB, the electromagnetic shielding effectiveness is greater than 48dB.

[0024] The particle size of the graphene is 1 μm, and the content is 15%wt; the resin is a phenolic resin; the conductivity of...

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Abstract

The invention discloses a 5G-based high-performance electromagnetic shielding material, of which the volume density is less than 2.5 g / cm3 and the electromagnetic shielding efficiency is greater than85dB; the high-performance electromagnetic shielding material is composed of foamy carbon, silicon carbide nanowires, graphene and phenolic resin. The preparation method comprises the following steps:taking organic foam as a raw material, carrying out pyrolysis at high temperature to prepare foam carbon, then carrying out in-situ growth of silicon carbide nanowires in the foam carbon by adoptinga chemical vapor deposition (CVI) method and Ni catalysis to obtain a silicon carbide nanowire reinforced foam carbon matrix, and then carrying out vacuum pressure impregnation with graphene modifiedresin, thereby finally obtaining the silicon carbide nanowire reinforced foam carbon material of the graphene modified resin. The material has a good shielding effect on high-frequency electromagneticwaves, the shielding bandwidth is large, the heat dissipation performance is good, and meanwhile structure and function integration is achieved.

Description

technical field [0001] The invention relates to the field of electromagnetic shielding, in particular to a 5G-based high-performance electromagnetic shielding material and a preparation method thereof. Background technique [0002] In the 5G era, the communication frequency band has expanded from 700 MHz to 6 GHz, and the problem of electromagnetic pollution has become more and more serious. Electromagnetic waves in non-working frequency bands interfere with the reception of radio, television, and communication signals, interfere with the normal operation of electronic instruments and equipment, and cause accidents such as information errors and control failures. , may ignite some flammable and explosive substances, etc. Therefore, electromagnetic shielding materials with excellent performance have become the focus of research. [0003] Electromagnetic shielding materials mainly achieve electromagnetic attenuation by reflecting and absorbing electromagnetic waves. (1) When ...

Claims

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Application Information

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IPC IPC(8): C08L61/06C08K7/24C08K7/00C08K3/34C08K3/04H05K9/00
CPCC08K7/24C08K7/00C08K3/34C08K3/042H05K9/0081C08K2201/011C08L61/06
Inventor 陈照峰肖七巧
Owner SUZHOU HONGJIU AVIATION THERMAL MATERIALS TECH CO LTD
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