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Preparation method of an ultra-broadband wave absorbing agent of a micron-scale square carbon material

A carbon material and block-shaped technology, applied in the field of electromagnetic wave absorbing materials, can solve the problems of no magnetic loss, complex process, high cost, etc.

Active Publication Date: 2021-09-14
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To sum up, carbon materials have good electromagnetic wave absorption performance, but there are usually several outstanding problems: (1) Single carbon materials usually do not have magnetic loss, and the wave absorption performance is weaker than that of magnetic materials (2) General carbon materials The material cannot have wider frequency band absorption characteristics at a thinner thickness (such as below 2.5mm); (3) The process is complicated and the cost is relatively high, which is not conducive to large-scale production

Method used

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  • Preparation method of an ultra-broadband wave absorbing agent of a micron-scale square carbon material
  • Preparation method of an ultra-broadband wave absorbing agent of a micron-scale square carbon material
  • Preparation method of an ultra-broadband wave absorbing agent of a micron-scale square carbon material

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Experimental program
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Effect test

Embodiment 1

[0029] The preparation method of the micron-scale square carbon material ultra-broadband wave absorbing agent of the present invention comprises the following steps:

[0030] Step 1: Add 150g of barium chloride, 150g of potassium nitrate and 20mL of absolute ethanol in sequence to 2g of 5,10,15,20-tetrakis(4-pyridyl)porphyrin, and stir at 70°C until uniformly mixed;

[0031] Step 2: Put the mixture prepared in step 1 into a porcelain boat of 100mm×40mm×20mm, and dry the mixture in a vacuum oven for 6 hours; place the dried mixture in argon for calcination, and the calcination temperature is 800°C, holding time 7h, heating rate 4°C / min;

[0032] Step 3: Soak the calcined product obtained in step 2 in a dilute hydrochloric acid solution with a mass fraction of 5wt% for 2 hours, add deionized water after soaking and boil it, and separate it by suction filtration after boiling, and collect the product after suction filtration to form a cube Graphene laminates.

[0033] The side ...

Embodiment 2

[0035] Step 1: Adjust the mixing ratio of raw materials to m 氯化钡 :m 硝酸钾 =1:2, that is, when barium chloride is 100g and potassium nitrate is 200g, the side length of the square carbon material is 1.2 μm, the area of ​​the carrier graphene film is about 9 square microns, and the number of stacks is two layers.

[0036] Step 2: Put the mixture prepared in step 1 into a porcelain boat of 100mm×40mm×20mm, and dry the mixture in a vacuum oven for 6 hours; place the dried mixture in argon for calcination, and the calcination temperature is 700°C, holding time 10h, heating rate 5°C / min;

[0037] Step 3: Soak the calcined product obtained in Step 2 in a dilute hydrochloric acid solution with a mass fraction of 6wt% for 2 hours, add deionized water after soaking and boil, and then separate by suction filtration after boiling, and collect the product after suction filtration to form a cube Graphene laminates, see image 3 .

[0038] When the mixing ratio of raw materials is adjusted...

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Abstract

The present invention relates to the technical field of electromagnetic wave absorbing materials, and provides a method for preparing an ultra-broadband wave absorbing agent of a micron-scale square carbon material. The problem, its main scheme comprises the following steps: (1) add barium chloride, potassium nitrate and dehydrated alcohol successively in 5,10,15,20-tetra(4-pyridyl) porphyrin, stir at high temperature until Mix evenly; (2) put the mixture prepared in step (1) into a porcelain boat, and dry the mixture under vacuum; place the dried mixture in argon for calcination; (3) put the step ( The calcined product obtained in 2) is boiled in deionized water, separated by suction filtration after boiling, and the product after suction filtration is collected. The square carbon material prepared by the method of the present invention has high absorption strength and wide absorption frequency band at low thickness, and the square size and the number of graphene stacks can be adjusted, so that the electromagnetic wave absorption performance of the material is also controllable.

Description

technical field [0001] The invention relates to a method for preparing an ultra-broadband wave absorbing agent of a micron-scale square carbon material, and belongs to the technical field of electromagnetic wave absorbing materials. [0002] technical background [0003] With the advancement of science and technology, electromagnetic waves bring great convenience to human beings in communication, industry and daily life, but also bring serious problems such as mutual interference between electronic devices and harm to human health. Electromagnetic wave absorbing materials provide a rather effective way to solve this problem by converting electromagnetic wave energy into heat energy. [0004] Microwave absorption means that the absorbing material can effectively absorb incident electromagnetic waves and convert electromagnetic energy into heat energy or consume other forms of energy. The electromagnetic loss capability of the absorbing agent directly determines the performance...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/05C01B32/184C09K3/00H05K9/00
CPCC09K3/00C01B32/05C01B32/184H05K9/0081
Inventor 薛卫东叶伟平高小洪赵睿
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA