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A kind of porous structure co/coo-c composite material and its preparation method and application

A composite material, porous structure technology, applied in chemical instruments and methods, other chemical processes, magnetic field/electric field shielding, etc. Absorption characteristics, strong wave absorbing ability, low density effect

Active Publication Date: 2020-12-18
ZHENGZHOU UNIVERSITY OF AERONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

High saturation magnetization of magnetic metals leads to high Snoek limit and permeability in high frequency region, which leads to strong magnetic losses
However, metallic Co always has a high density and is easily oxidized, which not only increases the weight of the electromagnetic wave absorbing film but also leads to a decrease in the magnetization

Method used

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  • A kind of porous structure co/coo-c composite material and its preparation method and application
  • A kind of porous structure co/coo-c composite material and its preparation method and application
  • A kind of porous structure co/coo-c composite material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028]A preparation method of porous structure Co / CoO-C composite material includes the following steps:

[0029](1) Use an analytical balance to weigh 15 mmol glucose, 2 mmol Co (NO3)2·6H2O, 10 mmol urea;

[0030](2) Measure 60 mL deionized water into a glass beaker;

[0031](3) First slowly add glucose to the glass beaker, and then slowly add Co (NO3)2·6H2O. Urea, magnetic stirring for 1 h;

[0032](4) Transfer the uniformly mixed solution from the glass beaker to the polytetrafluoroethylene autoclave, and then react in a dry box at 190 ℃ for 15 h;

[0033](5) After the reaction is over, take out the black precipitate from the reactor, and wash it with distilled water three times, then with absolute ethanol three times, and then dry it in a drying oven at 60 ℃ for 9 hours to obtain the precursor;

[0034](6) Put the obtained precursor in a small porcelain boat in a tube furnace under a nitrogen atmosphere, and heat it up to a calcination temperature of 450 ℃ at a heating rate of 5 ℃ / min, keep it fo...

Embodiment 2

[0036]The difference from Example 1 is that the calcination temperature in step (6) is changed to 600° C., and the obtained calcination product is labeled as N-600 sample; the others are the same as in Example 1.

Embodiment 3

[0038]The difference from Example 1 is that the calcination temperature in step (6) is changed to 750° C., and the obtained calcination product is labeled as N-750 sample; the others are the same as in Example 1.

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Abstract

The invention belongs to the technical field of electromagnetic wave absorbing materials, and discloses a porous Co / CoO-C composite material and a preparation method and application thereof. The composite material is composed of carbon spheres and Co / CoO composite particles attached to the surfaces of the carbon spheres; micropores are distributed in the surfaces of the carbon spheres, and the Co / CoO composite particles are of a core-shell structure; an inner core is Co, and an outer shell is CoO. The preparation method comprises the following steps: adding glucose, water-soluble cobalt salt and urea into water, and performing uniform stirring; controlling the temperature of the obtained solution at 170-190 DEG C, performing standing and carrying out hydrothermal reaction for 15-18 hours;after the hydrothermal reaction is finished, taking out precipitates, performing cleaning and drying to obtain a precursor; and in an inert or protective atmosphere, controlling the temperature of theprecursor at 450-900 DEG C, and performing calcining for 2-3 hours to obtain the Co / CoO-C composite material with the porous structure. The prepared Co / CoO-C composite material has better electromagnetic wave absorption characteristics, and can be widely applied to the corresponding fields of electromagnetic protection and microwave stealth as an electromagnetic wave absorption material.

Description

Technical field[0001]The invention belongs to the technical field of electromagnetic wave absorbing materials, and specifically relates to a porous structure Co / CoO-C composite material and a preparation method and application thereof.Background technique[0002]In recent years, with the development of microwave communication technology, mobile phones within the microwave range (0.8~1.5 GHz, 3GHz, 4 GHz), satellite broadcasting systems (11.7~12.0 GHz), local area network systems (2.45 GHz, 5.0 GHz, 19.0) GHz, 22.0 GHz) and other communication equipment are used more and more frequently. These equipment facilitate our daily life, but the electromagnetic pollution problem that comes with it has become more and more serious. The electromagnetic wave generated by the mobile phone network has a great impact on the human body; airport flights may not be able to take off due to electromagnetic wave interference; in hospitals, mobile phones often interfere with the normal operation of various...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05K9/00C09K3/00
CPCC09K3/00H05K9/0081
Inventor 赵彪郭晓琴李阳张锐白中义王艳高卡刘军威樊磊任玉美关莉
Owner ZHENGZHOU UNIVERSITY OF AERONAUTICS
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