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Preparation method of graphene modified FeCo absorber

A graphene modification and absorbent technology, which is applied in metal processing equipment, transportation and packaging, etc., can solve the problems of unsatisfactory low-frequency performance and long time consumption, so as to improve wave-absorbing performance, increase dielectric loss, and improve impedance matching Effect

Active Publication Date: 2020-04-03
725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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Problems solved by technology

[0006] Chinese patent CN101550003B discloses a nano-graphene-based composite wave-absorbing material and its preparation method. The composite wave-absorbing material includes graphene and nanoparticle deposition materials. The graphene-based composite wave-absorbing material has stable performance and the impedance matching peak is concentrated at High frequency, high frequency absorbing performance is good, but low frequency performance is not ideal, still needs to be improved; Chinese patent CN103304807A discloses a polyaniline / graphene / Co 3 o 4 The preparation method of nano wave-absorbing material, it is polyaniline / graphene / Co 3 o 4 Nanocomposite materials are compounded according to a certain ratio to prepare a lightweight absorbing coating, and when the frequency is 11.4 GHz, the absorbing performance is best up to -36.2dB, but this method requires a large amount of reagents, and Co 3 o 4 Long-term pretreatment to enable it to blend evenly with graphene, which takes a long time

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  • Preparation method of graphene modified FeCo absorber
  • Preparation method of graphene modified FeCo absorber
  • Preparation method of graphene modified FeCo absorber

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preparation example Construction

[0032] A kind of preparation method of graphene modified FeCo absorbent, such as figure 1 shown, including the following steps:

[0033] (1) Weigh the FeCo alloy powder with a mass fraction of 99.92%~99.88% and the graphene powder with a mass fraction of 0.08%~0.12% and mix them evenly to obtain a mixture; among them, the particle size of the FeCo alloy powder to be modified The range is 10~50μm. The particle size range of graphene powder is 10~20μm;

[0034] (2) Add the mixture into absolute ethanol, and then carry out ultrasonic dispersion. The duration of dispersion is four dispersion cycles, and one dispersion cycle is 8 minutes;

[0035] (3) Place the dispersed mixture in an evaporator to evaporate to a colloidal state;

[0036] (4) Ball mill the colloidal mixture, the ball milling time is 30min, and the ball-to-material ratio is 10:1; wash the ball-milled mixture, add the washed mixture to absolute ethanol for dispersion, and then place the mixture in Evaporate absol...

Embodiment 1

[0041] Weigh 4.996g (mass fraction 99.92%) of FeCo alloy powder and 0.004g (mass fraction 0.08%) of graphene powder, put them into a 250ml beaker, add 150ml of absolute ethanol, and then use ultrasonic dispersion for four cycles , about 30min; evaporate the excess absolute ethanol to a colloidal state, and then ball mill for 30min; wash the ball-milled sample and disperse it in absolute ethanol, then evaporate the absolute ethanol to dryness with a rotary evaporator, and place it in an oven at 70°C After drying for 3 hours, the modified FeCo absorbent was obtained.

Embodiment 2

[0043] Weigh 4.995g (mass fraction 99.9%) of FeCo alloy powder and 0.005g (mass fraction 0.1%) of graphene powder, put them into a 250ml beaker, add 150ml of absolute ethanol, and then use an ultrasonic disperser to disperse four Evaporate the excess absolute ethanol to a colloidal state, then ball mill for 30 minutes; wash the ball-milled sample and disperse it in absolute ethanol, then evaporate the absolute ethanol to dryness with a rotary evaporator, and dry it in an oven at 60°C After 4h, the modified FeCo absorbent was obtained.

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Abstract

The invention discloses a preparation method of a graphene modified FeCo absorber. The preparation method comprises the following steps of correspondingly weighing the unmodified FeCo alloy powder with the mass fraction of 99.92%-99.88% and the graphene powder with the mass fraction of 0.08%-0.12%, and uniformly mixing to obtain a mixture; adding a mixture into a dispersing agent, and carrying outultrasonic dispersion; putting the dispersed mixture in an evaporator to evaporate to a colloid state; carrying out ball milling on the colloid state mixture, washing the ball-milled mixture, addingthe washed mixture into the dispersing agent for dispersion, and then evaporating the dispersant in the mixture; and finally drying the evaporated mixture to obtain the modified FeCo absorber. The FeCo absorber is modified through the doped graphene powder, so that the dielectric loss of the absorber is improved, the wave absorption performance in the low-frequency range can be improved, the impedance matching of the absorber is improved, and the low-frequency band characteristic signal of the target object is effectively reduced.

Description

technical field [0001] The invention relates to the field of special functional materials, in particular to a preparation method of a graphene-modified FeCo absorbent. Background technique [0002] With the development of low-frequency detection technology, low-frequency detection technology is becoming more and more mature, and the detection spectrum can develop towards lower frequencies. Although the existing absorbing materials have a wide absorption frequency band, most of their absorption peaks are concentrated in the middle and high frequencies. For low-frequency performance, There is still a lot of room for improvement. [0003] foreign existing technology [0004] Russian patent RU20160146947 discloses a method for modifying an absorbent. Specifically, the absorbent is a wave-absorbing material composed of a non-woven structure and applying ferromagnetic metal to its surface by vacuum spraying. The invention It can improve the absorption characteristics of the abso...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F9/04
CPCB22F9/04B22F2009/043B22F1/14
Inventor 洪跃辉庄海燕叶志民
Owner 725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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