Method for preparing radar wave-absorbing composite material based on carbon nanometer film

Abstract

The invention provides a method for preparing a radar wave-absorbing composite material based on a carbon nanometer film, comprising the following steps of: mixing carbon nanotubes and an anion surface dispersant, grinding the mixture in a mortar, pouring the grinded mixture into a beaker, and adding plasma water; dispersing and defoaming an obtained mixed solution in a magnetic stirrer; adding graphene oxide into plasma water to preparing a solution, and ultrasonically dispersing; mixing a carbon nanotube solution and the graphene oxide solution, centrifuging the mixture after ultrasonically dispersing by an ultrasonic cell disruption instrument, and compacting and solidifying residue after vacuum pumping filtration of a supernatant of the carbon nanotube and graphene oxide solution; heat-treating; adding a carbon nanometer film into an acetone weak solution of a resin for pre-infiltrating, and then drying; and adding the carbon nanometer filmed with layer pre-infiltration into an innermost layer of an aluminium alloy mould, laying a layer of carbon fiber / resin pre-infiltrated material in the medium, locking the mould, and molding by mould compression. A radar wave reflection rate of the radar wave-absorbing composite material based on the carbon nanometer film in a frequency range from 8GHz to 18GHz is lower than -10- -20dB.

Description

technical field [0001] The invention relates to a method for preparing a wave-absorbing composite material, in particular to a method for preparing a radar wave-absorbing composite material based on a carbon nano-film, and belongs to the field of material science and technology. Background technique [0002] As an effective means to increase the survival and air defense capabilities of modern weapon systems and improve the overall combat effectiveness, radar absorbing technology has been highly valued by the world's military powers. Radar absorbing materials mainly convert incident radar waves into heat energy through electrical loss and magnetic loss. Radar absorbers are mainly golden powder and fiber represented by ferrite. Such absorbing materials have complex processing technology, high density, and poor environmental adaptability. According to reports, F117 rarely attacks in rainy days, because moisture will degrade the performance of the absorbing material. [0003] ...

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Problems solved by technology

[0004] However, the intermolecular force of carbon nanotubes is strong, and when the amount of dispersion in the polymer matrix is ​​large, they tend to agglomerate. At the same time, the huge specific surface area of ​​carbon nanotubes will also increase the viscosity of the polymer matrix, making it difficult to form composite materials. , which affects the overall mechanical properties of the composite material, and also increases the cost

Moreover, the microwave absorption of composite materials is mainly determined by the content and dispersion uniformity of carbon nanotubes. In order to obtain an effective carbon nanotube network structure, methods such as shear force stirring, three-roll stirring and ultrasonic dispersion are usually used, but resin-based The content of carbon nanotubes in the body is limited, and the prepared microwave-absorbing composite materials often cannot meet the requirements of engineering applications

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