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Sandwich structure wave-absorbing composite material and preparation method thereof

A composite material and sandwich technology, which is applied in the field of electromagnetic wave stealth, can solve the problems of difficult coordination between effective load bearing and broadband strong absorbing performance, large density and thickness, and complicated preparation process, so as to achieve high process control and reliability, and reduce reflection , The effect of simple preparation process

Active Publication Date: 2018-11-06
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to avoid the deficiencies of the prior art, the present invention proposes a sandwich-structured wave-absorbing composite material and its preparation method, which solves the problems of complex preparation process, high cost, large density and thickness, effective bearing capacity and wide-bandwidth of the existing structure-type wave-absorbing material. Strong microwave absorption performance is difficult to cooperate with other issues

Method used

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  • Sandwich structure wave-absorbing composite material and preparation method thereof
  • Sandwich structure wave-absorbing composite material and preparation method thereof
  • Sandwich structure wave-absorbing composite material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0029] (1) Place 3 g of carbon nanotubes in 97 ml of deionized water, stir and ultrasonically disperse for 3 hours to obtain a uniformly dispersed aqueous dispersion of carbon nanotubes; place 4.5 g of cellulose in 295.5 ml of deionized water, stir and ultrasonically disperse for 3 hours, Obtain a cellulose aqueous solution; mix and stir the obtained carbon nanotube aqueous dispersion and cellulose aqueous solution, and ultrasonically obtain a mixed solution for 3 hours; place the mixed solution in a cell with a cell size of 2 mm, a thickness of 5 mm, and a density of 30 kg / m 3 In the cells of the honeycomb material, the temperature was lowered at 5°C / min to -60°C for 6 hours, and dried under 0.1Pa vacuum condition for 30 hours. That is, an intermediate layer with absorbing properties is obtained.

[0030] (2) Put the cut single-layer glass fiber / carbon fiber cloth into the epoxy resin glue solution, completely soak the fiber cloth for 2 hours, take it out, and remove the exce...

Embodiment 2

[0033] (1) Place 2.6g of carbon nanotubes in 97.4ml of deionized water, stir and ultrasonically disperse for 3 hours to obtain a uniformly dispersed aqueous dispersion of carbon nanotubes; place 4.5g of cellulose in 295.5ml of deionized water, stir and ultrasonically disperse 3h to obtain a cellulose aqueous solution; mix and stir the obtained carbon nanotube aqueous dispersion and cellulose aqueous solution, and ultrasonically obtain a mixed solution for 3 hours; place the mixed solution in a cell with a cell size of 5mm, a thickness of 10mm, and a density of 48kg / m 3 In the cells of the honeycomb material, the temperature was lowered to -60°C at 5°C / min for pre-freezing for 6 hours, and dried under 0.1Pa vacuum for 36 hours. That is, an intermediate layer with absorbing properties is obtained.

[0034](2) Put the three layers of cut glass fiber / carbon fiber cloth into the phenolic resin glue, soak the fiber cloth for 2 hours, take it out, and remove the excess resin on the s...

Embodiment 3

[0037] (1) Put 2g of carbon nanotubes in 98ml of deionized water, stir and ultrasonically disperse for 3 hours to obtain a uniformly dispersed aqueous dispersion of carbon nanotubes; place 3g of cellulose in 297ml of deionized water, stir and ultrasonically disperse for 3 hours to obtain fibers plain aqueous solution; the obtained carbon nanotube aqueous dispersion and cellulose aqueous solution were mixed and stirred, and the mixed solution was obtained by ultrasonication for 3 hours; the mixed solution was placed in a cell size of 4mm, a thickness of 10mm, and a density of 48kg / m 3 In the cells of the honeycomb material, the temperature was lowered at 5°C / min to -60°C for 8 hours, and dried under 0.1Pa vacuum condition for 34 hours. That is, an intermediate layer with absorbing properties is obtained.

[0038] (2) Put 10 layers of cut glass fiber / carbon fiber cloth into the polyimide resin glue solution, completely soak the fiber cloth for 3 hours, take it out, and remove th...

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Abstract

The invention relates to a sandwich structure wave-absorbing composite material and a preparation method thereof, an integrated sandwich structure comprises an intermediate layer, an upper skin and alower skin, the intermediate layer is a honeycomb material filled with carbon nanotube / cellulose wave-absorbing foam, the upper skin is a quartz fiber cloth reinforced resin material having electromagnetic wave transmission characteristics, and the lower skin is a carbon fiber cloth-reinforced resin material having electromagnetic wave reflection characteristics. Specifically, the preparation method is carried out according to the following steps: 1. the intermediate layer, namely the honeycomb material filled with the carbon nanotube / cellulose wave-absorbing foam is prepared by a freeze-drying method; 2. the upper kin and the lower skin are prepared by impregnating resin with quartz fiber cloth / carbon fiber cloth; and 3. the intermediate wave-absorbing layer is compounded with the upper kin and the lower skin. The sandwich structure wave-absorbing composite material prepared by the method can replace existing wave-absorbing materials, and is widely used in aircrafts, ground weapon equipment, surface ships and other parts that have stealth requirements for electromagnetic waves.

Description

technical field [0001] The invention belongs to the field of electromagnetic wave stealth, and relates to a sandwich structure wave-absorbing composite material and a preparation method thereof. Background technique [0002] Electromagnetic wave absorbing materials refer to a class of functional materials that can effectively absorb incident electromagnetic waves so that their effective reflection cross-sectional area is significantly reduced. Two key parameters to characterize electromagnetic wave absorbing materials are the strongest absorption (RC min : minimum reflection coefficient, RC<-10dB means 90% of electromagnetic waves are absorbed) and effective absorption bandwidth (EAB: effective absorption bandwidth, RC<-10dB frequency band). According to the molding process, geometric characteristics and bearing capacity, it can be divided into coated absorbing materials, wedge absorbing materials, structural absorbing materials, etc. Coating-type absorbing materials...

Claims

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Application Information

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IPC IPC(8): B32B27/04B32B3/08B32B27/06B32B3/12B32B38/08B32B38/00B32B37/00
CPCB32B3/08B32B3/12B32B27/06B32B37/00B32B38/00B32B38/08B32B2038/0076B32B2260/021B32B2260/046B32B2307/20B32B2307/50
Inventor 殷小玮许海龙叶昉张立同成来飞
Owner NORTHWESTERN POLYTECHNICAL UNIV
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