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Co/MnO@C composite electromagnetic wave absorbing material and preparation method and application thereof

A technology for absorbing materials and electromagnetic waves, which is applied in the fields of magnetic/electric field shielding, electrical components, metal processing equipment, etc. It can solve the problems of complicated preparation process and increase the difficulty of material preparation, and achieve simple preparation process, excellent impedance matching ability and absorption strength strong effect

Active Publication Date: 2020-04-17
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the present invention found that the preparation method of multi-phase composite wave absorbing agent is mainly multi-layer coating and compounding, and the preparation process is relatively complicated.
In addition, the preparation of magnetic cobalt particles also needs to provide a reducing environment, which further increases the difficulty of material preparation.

Method used

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  • Co/MnO@C composite electromagnetic wave absorbing material and preparation method and application thereof
  • Co/MnO@C composite electromagnetic wave absorbing material and preparation method and application thereof
  • Co/MnO@C composite electromagnetic wave absorbing material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] The preparation of a Co / MnO@C composite electromagnetic wave absorbing material comprises the following steps:

[0053] (1) with Co(CH 3 COO) 2 4H 2 O as cobalt source, Mn(CH 3 COO) 2 4H 2 O is used as a manganese source, and polyvinylpyrrolidone (PVP-K30) is used as a shape control agent and a dispersant. The above-mentioned cobalt source and manganese source are added to 60mL of ethylene glycol solvent at a molar ratio of 2:1, and then 0.8g of polyvinylpyrrolidone is added. Vinylpyrrolidone, the obtained mixture was reacted at 200°C for 24 hours under airtight conditions; after the reaction was completed, the product was washed and dried at 60°C for 12 hours to obtain a manganese-cobalt hydroxide precursor;

[0054] (2) Calcining the manganese-cobalt hydroxide precursor prepared in step (1) at 400°C for 2 hours; then mixing 0.8 g of the calcined product with 1.5 mL of pyrrole and placing it in a closed reaction kettle , in a high-temperature furnace at 570°C for...

Embodiment 2

[0068] The preparation of a Co / MnO@C composite electromagnetic wave absorbing material is the same as in Example 1, the difference is that: when preparing the manganese-cobalt hydroxide precursor in step (1), the molar ratio of the cobalt source and the manganese source added is 0.5 :1.

[0069] The composite electromagnetic wave absorbing material prepared in this experiment example was characterized by scanning electron microscopy (SEM), and the results showed that the diameter of the synthesized composite electromagnetic wave absorbing material was between 1.0-3.0 μm.

[0070] The X-ray powder diffraction pattern (XRD) of the composite electromagnetic wave absorbing material prepared in this experimental example shows that the cobalt in the synthesized flower-like Co / MnO@C composite material is cobalt with a face-centered cubic structure, and the comparison with the standard diffraction data shows that the synthesized The cobalt purity is very high, and the manganese oxide ...

Embodiment 3

[0073] A kind of preparation of Co / MnO@C composite electromagnetic wave absorbing material, with embodiment 1, difference is: (1) use CoSO 4 As a cobalt source, MnSO 4 As a manganese source, polyvinylpyrrolidone (PVP-K30) is used as a shape control agent and dispersant. Add the above-mentioned cobalt source and manganese source in a molar ratio of 1:1 to 60mL of ethylene glycol solvent, and then add 0.8g of polyethylene Pyrrolidone, the obtained mixture was reacted at 180°C for 20 hours under airtight conditions; after the reaction was completed, the product was washed and dried at 60°C for 12 hours to obtain a manganese-cobalt hydroxide precursor;

[0074] (2) Calcining the manganese-cobalt hydroxide precursor prepared in step (1) at 450°C for 2 hours; then mixing 0.8 g of the calcined product with 1.5 mL of pyrrole and placing it in a closed reaction kettle , in a high-temperature furnace at 550 ° C for 7 hours, pyrrole pyrrole pyrrole decomposition will reduce the manganes...

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Abstract

The invention belongs to the technical field of electromagnetic wave absorbing materials, and particularly relates to Co / MnO@C composite electromagnetic wave absorbing material and a preparation method and application thereof. The electromagnetic wave absorbing material is composed of nano-scale manganese oxide, nanoscale cobalt particles and a carbon layer which coats an outer layer, wherein themanganese oxide and the cobalt particles are compounded to form a sheet layer structure, the sheet layer structure forms a monodisperse three-dimensional flower-shaped ball structure, and the carbon layer coats the outer surface of the flower-shaped ball structure. According to the preparation method, the flower-shaped Co / MnO@C composite electromagnetic wave absorbing material is prepared by adopting a synthetic route of a solvent thermal method and high-temperature carbon reduction. The composite powder material has the advantages of being high in saturation magnetization rate, large in coercive force, strong in oxidation resistance, excellent in electromagnetic wave absorption performance, simple in preparation process and low in cost.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic wave absorbing materials, and in particular relates to a Co / MnO@C composite electromagnetic wave absorbing material and its preparation method and application. Background technique [0002] The information disclosed in the Background of the Invention is only intended to increase the understanding of the general background of the invention, and is not necessarily to be taken as an acknowledgment or any form of suggestion that the information constitutes the prior art that is already known to those skilled in the art. [0003] With the rapid development of high-frequency communication technology and the application of various microwave electronic equipment, people's production and life are greatly facilitated, and electromagnetic pollution has become a new environmental problem. Electromagnetic radiation will not only have harmful effects on the human body and endanger human health, but also...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/20B22F1/02B22F1/00H05K9/00C01G45/02
CPCB22F9/20H05K9/0081C01G45/02B22F1/07B22F1/054B22F1/16Y02E60/13
Inventor 刘久荣刘伟徐冬梅王凤龙汪宙吴莉莉
Owner SHANDONG UNIV
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