Preparation method of honeycomb sandwich structure wave-absorbing composite filled with bowknot-shaped Co/C nano wave-absorbing material

A nano-wave absorbing material, honeycomb sandwich structure technology, applied in chemical instruments and methods, magnetic/electric field shielding, synthetic resin layered products, etc., can solve the problems of poor mechanical bearing capacity, difficult to meet, easy to wear and fall off Achieve the effect of improving the structural bearing and absorbing performance, improving the overall mechanical strength, and realizing the effect of broadband absorbing

Inactive Publication Date: 2019-07-23
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the above-mentioned traditional magnetic Co / C nanocomposites, most of which are in powder form, the use process is mainly to mix with paint to make wave-absorbing paint, which has high relative density, narrow absorption frequency band, poor mechanical bearing capacity, and is easy to wear and fall off during use, which is difficult to meet Due to the deficiencies of existing technologies such as the requirements of modern aircraft for the integration of radar absorbing material structure and electromagnetic absorbing function, the present invention provides a honeycomb sandwich structure absorbing composite material filled with bow-shaped Co / C nano-absorbing materials preparation method

Method used

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  • Preparation method of honeycomb sandwich structure wave-absorbing composite filled with bowknot-shaped Co/C nano wave-absorbing material
  • Preparation method of honeycomb sandwich structure wave-absorbing composite filled with bowknot-shaped Co/C nano wave-absorbing material
  • Preparation method of honeycomb sandwich structure wave-absorbing composite filled with bowknot-shaped Co/C nano wave-absorbing material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Dissolve cobalt nitrate and urea in deionized water with high-speed magnetic stirring for 30 minutes until completely dissolved to obtain liquid A; heat gelatin at 50°C and dissolve in deionized water under medium-speed magnetic stirring conditions, and keep stirring for 30 minutes to obtain liquid B; then add cobalt nitrate and urea mixed solution and gelatin solution (i.e. liquid A and liquid B) into a 250mL single-necked flask and mix, and react with magnetic stirring under heating conditions to obtain cobalt ion-gelatin molecule metal ion polymer organic framework purple colloid mixture.

[0025] (2) Take the purple colloidal mixed solution obtained in (1) and add it to a 100mL polytetrafluoroethylene liner reactor, and hydrothermally react for a certain period of time to obtain a bow-tie-shaped precursor (see attached figure 1 ), the precipitate was collected by centrifugation, and dried for 24 h for later use.

[0026] (3) Place the dried bowtie-shaped precur...

Embodiment 2

[0033](1) Dissolve cobalt nitrate and urea in deionized water with high-speed magnetic stirring for 30 minutes until completely dissolved to obtain liquid A; heat gelatin at 50°C and dissolve in deionized water under medium-speed magnetic stirring conditions, and keep stirring for 30 minutes to obtain liquid B; then add cobalt nitrate and urea mixed solution and gelatin solution (i.e. liquid A and liquid B) into a 250mL single-necked flask and mix, and react with magnetic stirring under heating conditions to obtain cobalt ion-gelatin molecule metal ion polymer organic framework purple colloid mixture.

[0034] (2) Take the purple colloidal mixed solution obtained in (1) and add it to a 100mL polytetrafluoroethylene liner reactor, hydrothermally react for a certain period of time to obtain a bowtie-shaped precursor, collect the precipitate by centrifugation, and dry it for 24 hours before use.

[0035] (3) The dried bowtie-shaped precursor sample obtained in (2) was placed in a...

Embodiment 3

[0042] (1) Dissolve cobalt nitrate and urea in deionized water with high-speed magnetic stirring for 30 minutes until completely dissolved to obtain liquid A; heat gelatin at 50°C and dissolve in deionized water under medium-speed magnetic stirring conditions, and keep stirring for 30 minutes to obtain liquid B; then add cobalt nitrate and urea mixed solution and gelatin solution (i.e. liquid A and liquid B) into a 250mL single-necked flask and mix, and react with magnetic stirring under heating conditions to obtain cobalt ion-gelatin molecule metal ion polymer organic framework purple colloid mixture.

[0043] (2) Take the purple colloidal mixed solution obtained in (1) and add it to a 100mL polytetrafluoroethylene liner reactor, hydrothermally react for a certain period of time to obtain a bowtie-shaped precursor, collect the precipitate by centrifugation, and dry it for 24 hours before use.

[0044] (3) The dried bowtie-shaped precursor sample obtained in (2) was placed in ...

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Abstract

The invention discloses a preparation method of a honeycomb sandwich structure wave-absorbing composite filled with a bowknot-shaped Co / C nano wave-absorbing material, and relates to the technical field of electromagnetic stealth composite materials. The method comprises the steps as follows: synthesizing a cobalt ion-gelatin polymer precursor in a bowknot shape from cobalt nitrate and gelatin asraw materials with a hydrothermal method; performing heat treatment to prepare a CO / C nano composite wave-absorbing material with a bowknot-shaped hierarchical structure; filling cells of periodic aramid honeycombs with the prepared CO / C nano-wave absorbing material, and covering upper and lower sides of the filled honeycomb with glass fiber reinforced resin matrix composite skin and carbon fiberreinforced resin matrix composite skin respectively to obtain the honeycomb sandwich wave-absorbing composite filled with the bowknot-shaped CO / C nano-composite wave-absorbing material. The technicalproblems of narrow effective absorption frequency band and poor mechanical bearing capacity of traditional wave-absorbing materials are solved.

Description

technical field [0001] The invention relates to the technical field of electromagnetic stealth composite materials, in particular to a preparation method of a honeycomb sandwich structure wave-absorbing composite material filled with bow-knot-shaped Co / C nano wave-absorbing materials. Background technique [0002] With the development of modern radar detection technology in the military field, weapons and equipment represented by military fighter jets are being tracked and detected more and more frequently. It has brought serious electromagnetic radiation pollution problems. Therefore, as the most effective solution to the above problems, electromagnetic wave absorbing materials that can convert the energy of electromagnetic waves into heat energy and lose them, thereby significantly reducing the reflection of electromagnetic waves, have received more and more attention. Due to the limitations of the actual use environment, the performance characteristics of ideal electroma...

Claims

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Application Information

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IPC IPC(8): B32B9/00B32B5/02B32B9/04B32B17/04B32B17/10B32B17/12B32B27/36H05K9/00B32B27/02B32B27/04B32B27/38B32B3/12B32B3/08B32B7/12B32B33/00C08G83/00
CPCB32B3/08B32B3/12B32B5/02B32B5/26B32B7/12B32B33/00B32B37/12B32B38/00B32B2260/021B32B2260/046B32B2262/0261B32B2262/101B32B2262/106B32B2307/212C08G83/008H05K9/0081
Inventor 李宜彬杨明龙袁野赫晓东尹维龙李建军
Owner HARBIN INST OF TECH
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