Preparation method of nano composite wave-absorbing material

Abstract

The invention relates to a nano composite wave-absorbing material and a preparation method thereof. The method comprises the steps of preparing a barium ferrite through coprecipitation by using bariumnitrate and ferric nitrate as raw materials, and synthesizing a core-shell micro-particle by using barium ferrite as a core and by using manganese dioxide as a shell through a hydrothermal method, using natural graphite powder as a raw material, and concentrated sulfuric acid and potassium permanganate as oxidants, using an improved Hummers method to prepare graphite oxide, finally ultrasonicallydispersing the graphite oxide and a prepared micro-particle sample, and successfully synthesizing the nano composite wave-absorbing material through a series of reduction. The method adopted by the invention is simple, and the composite wave-absorbing material prepared by the coprecipitation, the hydrothermal method and the improved Hummers method has high magnetic loss and good wave-absorbing property.

Description

technical field [0001] The invention relates to a preparation method of a composite wave-absorbing material, belonging to the technical field of wave-absorbing materials. Background technique [0002] With the rapid development of the electronic technology industry, the increase of electronic equipment produces more electromagnetic radiation. It not only interferes with the use of communication equipment, but also causes harm to human health and the ecological environment. Therefore, in recent years, people have devoted themselves to the research of electromagnetic wave absorbing materials. The so-called electromagnetic wave absorbing materials refer to materials that can absorb or attenuate most of the electromagnetic waves projected on their surfaces or convert them into other forms of energy. With people's in-depth research on various materials, the choice of absorbing materials and absorbers is becoming wider and wider. [0003] The new generation of absorbing material...

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Problems solved by technology

[0005] In order to solve this problem in the prior art, the inventors choose to load the microspheres with magnetic barium ferrite / manganese dioxide core-shell structure on the surface of graphene, which can not only improve the magnetic properties of the material, but also enhance the magnetic loss of the composite material. It is beneficial to the impedance matching of the composite material, and the ferrite@manganese dioxide barium microspheres are used as an isolation medium to reduce the re-stacking of graphene into a three-dimensional graphite structure during the drying process, effectively stabilizing the graphene sheet structure, and the microspheres The fiber mesh structure is also conducive to the reflection and scattering of more frequencies of electromagnetic waves, which improves the loss

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