A kind of gradient graphene oxide-based structure wave-absorbing material and its preparation method

Abstract

The invention relates to a gradient type graphene oxide-based structure wave-absorbing material and a preparation method thereof. The method comprises: using a dispersant to prepare graphene oxide, auxiliary agent, curing agent and epoxy resin into various mixed slurries with different graphene oxide mass percentages; The materials were casted on the release paper to form a film to obtain a plurality of graphene oxide dielectric films in a semi-cured state with different graphene oxide mass percentages; The method of increasing or decreasing the content is alternately bonded to the rigid foam material layer in sequence to obtain a layered structure; the obtained layered structure is cured to obtain a gradient graphene oxide-based structure wave-absorbing material. The gradient type graphene oxide-based structure wave-absorbing material prepared by the method of the invention has a lower surface density while improving the radar wave absorption bandwidth and absorption depth, and can realize the stealth integration of various weapon equipment components.

Description

technical field [0001] The invention belongs to the technical field of wave-absorbing materials, and in particular relates to a gradient-type graphene oxide-based structure wave-absorbing material and a preparation method thereof. Background technique [0002] The RCS (radar cross section) of a typical target such as an aircraft is an important parameter affecting its survivability. 70% of the RCS is determined by its overall shape design. The introduction of radar low RCS shape design requirements has brought new challenges to the aerodynamic design of aircraft. constraints, leading to compromises in many traditional aerodynamic design criteria. The other 30% can be reduced by attaching, coating, and pasting absorbing materials to achieve RCS reduction. Traditionally, microwave-absorbing materials are often affected by limiting factors such as weight gain, adhesion, and impact strength, and it is difficult to balance these factors with the RCS index. [0003] With the dev...

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Problems solved by technology

Traditionally, microwave-absorbing materials are often affected by limiting factors such as weight gain, adhesion, impact strength, etc., and it is difficult to balance these factors with the RCS index

[0003] With the development of radar low RCS technology on aircraft, the current radar absorbing materials have also developed from simple radar absorbing materials to radar absorbing series materials, and the implementation method has evolved from spraying and pasting to a series of structural and functional integration. The material replaces the original metal material; in terms of absorbing performance, the traditional absorbing coating material is usually used to solve the problem of low scattering in the specified frequency range, which is a narrow-band material, while the structural absorbing material is usually in a relatively wide It has good wave-absorbing characteristics in the frequency range; in terms of mechanical properties, traditional wave-absorbing coatings are prone to quality problems such as aging, cracking, and failure, which lead to degradation or loss of RCS performance of weapons and equipment, and even bring safety hazards; while structural Type wave-absorbing materials often have strong mechanical properties while being functionalized. They usually use non-metallic materials with good wave-transmitting properties such as foam, glass fiber reinforced plastics, and plastics as the surface layer to play the role of surface protection and partial load bearing, and have wave-absorbing properties. The material is placed in the middle layer, and the metal or carbon fiber material is used as the bottom layer to play the role of secondary reflection of electromagnetic waves

[0004] In order to improve the wave-absorbing performance of wave-absorbing materials, people construct wave-absorbing materials with multi-layer structures, so that the electrical properties of each layer of materials change gradually to reduce the reflection of electromagnetic waves by materials; however, the wave-absorbing materials of current multi-layer structures Due to the low matching degree of the electromagnetic characteristic impedance of the material at the contact surface between different layers, the electromagnetic wave still has a certain reflection at the contact surface, and the wave-absorbing performance needs to be further improved.

Chinese patent application 201810658619.X discloses a gradient layered foam absorbing material and its preparation method. The gradient layered foam absorbing material in this application includes a multi-layer foam absorbing layer. The foam absorbing The wave absorbing layer is made by foaming a wave absorbing agent and a soluble polymer matrix, and the mass fraction of the wave absorbing agent in the multi-layer foam absorbing layer is distributed in a layer-by-layer gradient, but the preparation process of the wave absorbing material is relatively complicated, and the absorbing material The wave material has only one absorption peak, and the wave absorption performance in the low frequency band and high frequency band is poor

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