Resin column reinforced broadband wave-absorbing/bearing composite material and preparation method thereof

Abstract

The invention belongs to the technical field of wave-absorbing materials and discloses a resin column reinforced broadband wave-absorbing / bearing composite material and a preparation method thereof. The preparation method comprises the steps of sequentially stacking an impedance matching layer playing a role in impedance gradual change, a wave-absorbing layer containing an absorbent and a reflecting layer are on a lower portion of a wave-transmitting layer to form a laminated structure, and punching through holes in the formed laminated structure, enabling resin to flow into the through holesby adopting a wet forming process, and forming resin column structures penetrating through the whole laminated structure at the positions of the through holes. According to the invention, the throughholes are punched in advance in the thickness direction of a multi-layer structure prefabricated body, the process characteristics of wet molding of the composite material are used, the resin is poured into the through holes in the prefabricated body filling process to form Z-direction resin column structures, the effect of enhancing the interlayer performance is achieved, the forming process is simple, the mechanical property is excellent, the interlayer performance is greatly enhanced through the resin column structures formed at the through holes, and the defect that a current wave-absorbing composite material wave-absorbing layer is easily layered can be effectively overcome.

Description

technical field [0001] The invention belongs to the technical field of wave-absorbing materials, and in particular relates to a resin column-reinforced broadband wave-absorbing / carrying composite material and a preparation method thereof. Background technique [0002] Electromagnetic wave absorber is a functional composite material that can effectively absorb incident electromagnetic waves and significantly reduce echo intensity. It has important applications in the fields of military stealth, civilian electromagnetic protection and anti-electromagnetic interference. Structural wave-absorbing composite materials use fiber reinforcements for integrated design of wave-absorbing performance and mechanical properties, so as to have dual functions of wave-absorbing and load-carrying, which can avoid the coating-type wave-absorbing material from falling off easily, weather resistance, etc. It has become an important direction in the research field of absorbing materials. [0003]...

AI Technical Summary

Problems solved by technology

[0008] (1) Existing absorbing / carrying composite materials have poor electrical performance stability and narrow absorbing frequency band

[0009] (2) The overall interlaminar shear performance of the existing wave-absorbing composite material is insufficient

[0010] (3) At present, there is no preparation method for broadband absorbing composite materials that can take into account both electrical stability and interlayer performance

[0014] The stability of electrical properties and interlayer performance are the basic properties of wave-absorbing / carrying composite materials. If the electrical properties are unstable, the wave-absorbing / carrying composite material will lose its value of absorbing electromagnetic waves, thereby losing its functionality; if the interlayer performance is insufficient , the wave-absorbing / carrying composite material is easily damaged by external force during service, thus losing its usability

In addition, due to the wide frequency band involved in the radar wave of the current military radar, the absorbing / carrying composite material in the narrow frequency band has a small application area, and it is difficult to meet the needs of equipment development.

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