Submicron hollow cobalt ferrite wave-absorbing material and preparation method thereof

A hollow cobalt iron, sub-micron technology, applied in chemical instruments and methods, nanotechnology for materials and surface science, cobalt compounds, etc. Small size effect, improved impedance matching, no effect of impurity introduction

Pending Publication Date: 2020-08-14
ARMOR ACADEMY OF CHINESE PEOPLES LIBERATION ARMY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there are many studies on the composite of cobalt ferrite and other materials, but the preparation of submicron hollow cobalt ferrite has not been reported yet.

Method used

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  • Submicron hollow cobalt ferrite wave-absorbing material and preparation method thereof
  • Submicron hollow cobalt ferrite wave-absorbing material and preparation method thereof
  • Submicron hollow cobalt ferrite wave-absorbing material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0029] Weigh 13.52g of ferric chloride hexahydrate, 5.56g of cobalt chloride hexahydrate, 36g of urea, and 20ml of polyethylene glycol, respectively add to 400ml of ethylene glycol solvent, stir evenly for 30min, weigh 20g of polyvinylpyrrolidone and add to In the above solution, stir evenly to form a suspension. After mixing evenly, add it into a polytetrafluoroethylene-lined autoclave, and keep it in a blast drying oven at 200°C for 8 hours. After cooling to room temperature, it was washed with deionized water and absolute ethanol several times by centrifugation. Then, put it into a vacuum drying oven at 60° C. for 24 hours under vacuum. figure 1 It is a scanning electron microscope photo of cobalt ferrite absorbing material, the crystal grain is spherical, the size is between 100-500nm, it is a submicron structure, and there is no obvious agglomeration phenomenon. figure 2 It is a transmission electron microscope photo of cobalt ferrite absorbing material. It can be seen...

Embodiment 2

[0031] Weigh 13.52g of ferric chloride hexahydrate, 5.56g of cobalt chloride hexahydrate, 36g of urea, and 20ml of polyethylene glycol, respectively add to 400ml of ethylene glycol solvent, stir evenly for 30min, weigh 40g of polyvinylpyrrolidone and add to In the above solution, stir evenly to form a suspension. After mixing evenly, add it into a polytetrafluoroethylene-lined autoclave, and keep it in a blast drying oven at 200°C for 8 hours. After cooling to room temperature, it was washed with deionized water and absolute ethanol several times by centrifugation. Then, put it into a vacuum drying oven at 60° C. for 24 hours under vacuum. Figure 5 It is a scanning electron microscope photo of cobalt ferrite absorbing material, the crystal grain is spherical, the size is between 100-300nm, it is a submicron structure, and there is no obvious agglomeration phenomenon. Figure 6 It is a transmission electron microscope photo of the hollow cobalt ferrite absorbing material. It...

Embodiment 3

[0033] Weigh 13.52g of ferric chloride hexahydrate, 5.56g of cobalt chloride hexahydrate, 36g of urea, and 20ml of polyethylene glycol, respectively add to 400ml of ethylene glycol solvent, stir evenly for 30min, weigh 60g of polyvinylpyrrolidone and add to In the above solution, stir evenly to form a suspension. After mixing evenly, add it into a polytetrafluoroethylene-lined autoclave, and keep it in a blast drying oven at 200°C for 8 hours. After cooling to room temperature, it was washed with deionized water and absolute ethanol several times by centrifugation. Then, put it into a vacuum drying oven at 60° C. for 24 hours under vacuum. Figure 9 It is a photograph of the morphology of cobalt ferrite absorbing material, the crystal grain is spherical, the size is between 50-150nm, and it is a mixed structure of nanometer and submicron. Figure 10 It is a transmission electron microscope photo of cobalt ferrite absorbing material. It can be seen from the figure that most o...

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PUM

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Abstract

The invention provides a submicron hollow cobalt ferrite electromagnetic wave-absorbing material and a preparation method thereof. The submicron hollow cobalt ferrite electromagnetic wave-absorbing material is prepared by taking ferric chloride hexahydrate and cobalt chloride hexahydrate as main raw materials. Cobalt ferrite is generated through a hydrothermal method. The submicron hollow cobalt ferrite wave-absorbing material prepared by the hydrothermal method has the advantages of energy conservation, consumption reduction, simple operation process and the like. The product is submicron powder, the small-size effect and the interface effect are increased, the product is of a hollow structure, impedance matching is improved, the electric loss capacity is improved, and the electromagneticwave absorption capacity of the material is improved.

Description

Technical field: [0001] The invention belongs to the technical field of electromagnetic wave absorbing materials, and specifically relates to a submicron hollow cobalt ferrite electromagnetic wave absorbing material and a preparation method thereof, which are mainly used for electromagnetic wave protection of equipment. Background technique: [0002] With the development of electronic equipment and wireless information technology, electronic technology has been widely used in industry and commerce. While making people's lives more convenient, it also produces a large amount of electromagnetic radiation pollution. Microwave absorbing materials play an important role in electronic reliability, electromagnetic interference shielding and national defense security. Therefore, the development of high-performance absorbing materials with low density, thin thickness, strong absorption rate and wide absorption bandwidth has attracted people's attention. [0003] Cobalt ferrite is on...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G51/00B82Y30/00B82Y40/00
CPCC01G51/00B82Y30/00B82Y40/00C01P2002/72C01P2004/03C01P2004/04C01P2004/32C01P2004/62C01P2006/40C01P2006/42C01P2004/64
Inventor 梁义魏世丞袁悦王玉江王博陈茜
Owner ARMOR ACADEMY OF CHINESE PEOPLES LIBERATION ARMY
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