Preparation method of carbon-cladding Fe3O4 microsphere wave-absorbing material

A wave-absorbing material and carbon-coated technology, which is applied in the preparation/purification of carbon, chemical instruments and methods, oxides of ferrous iron, etc., can solve the problems of low dielectric constant, poor electromagnetic wave absorption, and difficult to achieve impedance matching, etc. Problems, to achieve the effect of enhancing wave-absorbing performance, improving impedance matching, and enhancing electromagnetic wave absorbing performance

Inactive Publication Date: 2013-09-25
HARBIN INST OF TECH
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  • Application Information

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Problems solved by technology

[0004] The present invention is to solve the current Fe 3 o 4 The dielectric constant is low, it is difficult to achieve impedance matching, which leads to the problem of poor electromagnetic wave absorption, and a carbon-coated Fe 3 o 4 Preparation method of microsphere absorbing material

Method used

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  • Preparation method of carbon-cladding Fe3O4 microsphere wave-absorbing material
  • Preparation method of carbon-cladding Fe3O4 microsphere wave-absorbing material
  • Preparation method of carbon-cladding Fe3O4 microsphere wave-absorbing material

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specific Embodiment approach 1

[0013] Specific implementation mode 1: In this implementation mode, carbon-coated Fe 3 o 4 The preparation method of the microsphere absorbing material is carried out according to the following steps:

[0014] 1. Preparation of Fe 3 o 4 Microspheres: 1~5g of FeCl 3 ·6H 2 Dissolve O in 50-100mL of organic solvent, stir evenly to obtain solution A; dissolve 1-5g of precipitant in 50-100mL of organic solvent, stir uniformly to obtain solution B, mix the obtained solution A with solution B, Stir evenly to obtain a mixed solution, put the obtained mixed solution into a polytetrafluoroethylene high-pressure reactor, and react at 100-200°C for 12-24 hours to obtain the product A, then wash the obtained product A with distilled water, and then wash it with absolute ethanol Product A was washed and finally dried to obtain Fe 3 o 4 Microspheres;

[0015] 2. Fe coated with phenolic resin 3 o 4 Preparation of microspheres: 0.5 to 2 g of Fe obtained in step 1 3 o 4 Put the micr...

specific Embodiment approach 2

[0017] Embodiment 2: This embodiment is different from Embodiment 1 in that: the organic solvent described in step 1 is one of ethylene glycol and glycerin or a mixture of the two in any ratio. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0018] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that the precipitant described in step one is one or more of anhydrous sodium acetate, crystalline sodium acetate, and sodium citrate in any ratio. mixture. Others are the same as in the first or second embodiment.

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Abstract

The invention relates to a preparation method of a carbon-cladding Fe3O4 microsphere wave-absorbing material, and relates to a preparation method of a wave-absorbing material. The preparation method aims to solve the problem of poor electromagnet wave absorption because impedance match is difficult to realize due to lower dielectric constant of Fe3O4 at present. The method comprises the following steps of: 1, preparing a Fe3O4 microsphere; 2, preparing a phenolic resin-cladding Fe3O4 microsphere; 3, preparing a carbon-cladding Fe3O4 microsphere. The carbon and Fe3O4 core-shell structure wave-absorbing material prepared through the method disclosed by the invention achieves the real part of a dielectric constant more than 18 and the imaginary part of the dielectric constant mainly about 0 at low frequency, thereby being favorable to realizing the impedance match and enhancing the wave-absorbing property; the carbon and Fe3O4 core-shell structure composite material prepared through the method disclosed by the invention can be used for the field of electromagnet wave absorption.

Description

technical field [0001] The invention relates to a preparation method of a wave-absorbing material. Background technique [0002] Fe 3 o 4 It is one of the common ferrite materials and is widely used in the field of electromagnetic wave absorption, but untreated Fe 3 o 4 Usually the dielectric constant is low, the real part of the dielectric constant does not exceed 5, and the imaginary part of the dielectric constant does not exceed 2.5. It is difficult to achieve impedance matching, so the electromagnetic wave absorption performance is greatly limited. To improve Fe 3 o 4 Impedance matching characteristics, need to further improve its dielectric constant. Carbon-based materials have a high dielectric constant, and Fe 3 o 4 The preparation of composite materials can not only greatly improve Fe 3 o 4 Dielectric constant, carbon-based materials are also common dielectric loss electromagnetic wave absorbers, and also have good attenuation properties for microwaves. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/08C01B31/02C09K3/00C01B32/05
Inventor 杜耘辰刘文文韩喜江
Owner HARBIN INST OF TECH
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