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Synthesis method of porous magnetic metal oxide/carbon composite wave-absorbing material

A technology of magnetic metal and wave absorbing material, applied in chemical instruments and methods, magnetic/electric field shielding, other chemical processes, etc., to achieve the effects of excellent microwave absorption performance, simple process and low cost

Active Publication Date: 2021-01-08
JINZHONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although some progress has been made in the construction and exploration of such materials and their microwave absorption properties, the preparation methods with cheap raw materials, simple processes, and adjustable magnetic content in a wide range are still promising in the research field of carbon-based microwave absorbing materials. One of the challenging subjects and difficulties

Method used

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  • Synthesis method of porous magnetic metal oxide/carbon composite wave-absorbing material
  • Synthesis method of porous magnetic metal oxide/carbon composite wave-absorbing material
  • Synthesis method of porous magnetic metal oxide/carbon composite wave-absorbing material

Examples

Experimental program
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Effect test

Embodiment 1

[0041] A porous Fe 3 o 4 The synthetic method of / carbon composite wave-absorbing material is characterized in that, its steps are as follows:

[0042] Step 1, prepare porous carbon fiber: put 11.5 g absorbent cotton gauze at 700 o C, N 2 Calcined under the atmosphere for 2 h, the heating rate was 4 o C / min, obtain cotton-based porous carbon fiber;

[0043] Step 2, porous carbon fiber loaded iron nitrate:

[0044] Take 0.7 g of porous carbon fiber and soak it in 50 ml of 0.5 mol / L Fe(NO 3 ) 3 9H 2 O solution, after soaking for 24 hours, use tweezers to clamp out the wet porous carbon fiber, and when there is no solution dripping, put it in an evaporating dish at 60 o C and dried for 12 h to obtain a porous carbon fiber loaded ferric nitrate sample;

[0045] Step 3, porous carbon supported α-Fe 2 o 3 :

[0046] The product obtained in step 2 is placed in a muffle furnace with a heating rate of 2 o C / min, 300 o Calcined at C for 2 h to obtain porous carbon-supporte...

Embodiment 2

[0061] A kind of preparation method of porous NiO / carbon composite wave-absorbing material, it is characterized in that, its steps are as follows:

[0062] Step 1, preparing porous carbon fibers: 12.5 g bamboo fibers were prepared at 700 o C, N 2 Calcined under the atmosphere for 2 h, the heating rate was 4 o C / min to obtain bamboo-based porous carbon fibers.

[0063] Step 2, porous carbon fiber loaded with nickel nitrate

[0064] Take 0.8 g of porous carbon fiber and soak in 50 ml of 0.5 mol / L Ni(NO 3 ) 2 ·6H 2 O solution, after soaking for 24 h, use tweezers to clamp out the wet porous carbon fiber, and when there is no solution dripping, put it into an evaporating dish at 60 o Dry for 15 h at C to obtain a porous carbon fiber loaded ferric nitrate sample;

[0065] Step 3, porous carbon supported NiO

[0066] The product that step 2 makes is in muffle furnace, 300 o C for 2 h at a heating rate of 2 o C / min, that is, supporting NiO on porous carbon.

[0067] Figure...

Embodiment 3

[0071] A kind of preparation method of porous NiO / carbon composite wave-absorbing material, it is characterized in that, its steps are as follows:

[0072] Step 1, preparing porous carbon fibers: 12.5 g bamboo fibers were prepared at 700 o C, N 2 Calcined under the atmosphere for 2 h, the heating rate was 4 o C / min to obtain bamboo-based porous carbon fibers.

[0073] Step 2, porous carbon fiber loaded with nickel nitrate

[0074] Take 0.8 g of porous carbon fiber and soak in 50 ml of 0.2 mol / L Ni(NO 3 ) 2 ·6H 2 O solution, after soaking for 24 h, use tweezers to clamp out the wet porous carbon fiber, and when there is no solution dripping, put it into an evaporating dish at 60 o Dry for 15 h at C to obtain a porous carbon fiber loaded ferric nitrate sample;

[0075] Step 3, porous carbon supported NiO

[0076] The product that step 2 makes is in muffle furnace, 300 o C for 2 h at a heating rate of 2 o C / min, that is, supporting NiO on porous carbon. The NiO loading...

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Abstract

The invention discloses a synthesis method of a porous magnetic metal oxide / carbon composite wave-absorbing material. The method comprises the following steps of: using porous carbon fibers obtained by roasting plant fibers with stable structures like cotton fibers, hemp fibers, bamboo fibers and the like in a high-temperature protective atmosphere as a carbon source and a template, impregnating nitrates of metals like Fe, Co, Ni and the like, and then performing roasting, thus obtaining the porous magnetic metal oxide / carbon composite wave-absorbing material, and further realizing regulationand control of the loading capacity of Fe3O4, Co3O4, NiO and other magnetic metal oxides in a wide range. The method disclosed by the invention has the advantages that: (1) the raw materials are widein source, renewable and low in cost; (2) the process is simple, the synthesis cost is low, complex synthesis equipment and chemical reagents are not needed, and the method is suitable for industrialproduction; (3) the magnetic components are loaded on the porous carbon, so that the material density is very low; (4) by controlling process conditions, the ratio of the magnetic components to the porous carbon can be regulated and controlled in a relatively wide range; and (5) the composite material has multiple electromagnetic loss mechanisms and is a novel light efficient microwave absorbent.

Description

Technical field [0001] The invention relates to a method for synthesizing porous magnetic metal oxide / carbon composite microwave absorbing materials and belongs to the technical field of microwave absorbing materials. Background technique [0002] In recent years, as electromagnetic pollution and interference problems have become more and more serious, research on electromagnetic wave absorbing materials has received widespread attention. Absorbing materials are increasingly used in both civilian and national defense industries, and the performance requirements for materials are getting higher and higher. Carbon materials have received widespread attention from absorbing material researchers due to their good chemical and thermal stability, excellent dielectric properties and low density. Optimizing the combination of magnetic materials and carbon materials can not only overcome the high density defects of ferrite, magnetic metals, magnetic metal oxides, alloys and other ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K3/00H05K9/00
CPCC09K3/00H05K9/0081
Inventor 李万喜
Owner JINZHONG UNIV
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