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Preparation method of honeycomb sandwich structured wave-absorbing composite filled with leaf-like nano-Fe3O4

A technology of honeycomb sandwich structure and composite materials, which is applied in the direction of nanotechnology, nanotechnology, chemical instruments and methods, etc., which can solve the requirements of easy wear and damage, and the difficulty in realizing the integration of the structure of the absorbing material and the absorbing function of the aircraft To achieve the effect of improving the mechanical strength, improving the structural load-bearing and wave-absorbing performance

Active Publication Date: 2019-07-23
SHENZHEN STRONG ADVANCED MATERIALS RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

where Fe 3 o 4 As a traditional magnetic absorbing material, it is the most widely used material in ferrite. It has the advantages of high magnetic permeability, high absorbing strength, and simple preparation. As a double loss medium, Fe 3 o 4 Magnetic absorbing materials have both magnetic loss and dielectric loss for electromagnetic waves, but traditionally, Fe 3 o 4 Magnetic wave-absorbing materials are mainly coated with coatings, which are easy to wear and damage during use, and due to the state of the coating, it is difficult to meet the requirements of modern aircraft for the integration of structural load-bearing and wave-absorbing functions of wave-absorbing materials

Method used

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  • Preparation method of honeycomb sandwich structured wave-absorbing composite filled with leaf-like nano-Fe3O4
  • Preparation method of honeycomb sandwich structured wave-absorbing composite filled with leaf-like nano-Fe3O4
  • Preparation method of honeycomb sandwich structured wave-absorbing composite filled with leaf-like nano-Fe3O4

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Dissolve 2.63g of potassium ferricyanide in 80mL of deionized water and stir magnetically for 1 hour; to obtain a potassium ferricyanide solution, pour the obtained red solution into a 100mL polytetrafluoroethylene reactor liner, seal it into a stainless steel In the shell, hydrothermal reaction at 140°C for 48 hours to obtain leaf-shaped nano-α-Fe 2 o 3 , centrifuged at 8000rpm for 10min to collect the precipitate, washed several times with deionized water and alcohol. Dry in a blast drying oven at 60°C for 24 hours before use.

[0024] (2) the leaf-shaped nano-α-Fe obtained in (1) 2 o 3 The sample was placed in a tube furnace and heat-treated at 350°C for 1 hour in a reducing hydrogen and argon mixed gas environment to obtain leaf-like nano-Fe 3 o 4 Absorbing material. Scanning electron microscope photos show that the product is in the shape of a special nano-leaf, as shown in the attached figure 1 shown. In the heat treatment process, the flows of hydroge...

Embodiment 2

[0028] (1) Dissolve 2.63g of potassium ferricyanide in 80mL of deionized water and stir magnetically for 1 hour; to obtain a potassium ferricyanide solution, pour the obtained red solution into a 100mL polytetrafluoroethylene reactor liner, seal it into a stainless steel In the shell, hydrothermal reaction at 100°C for 12 hours to obtain leaf-shaped nano-α-Fe 2 o 3 , centrifuged at 7000rpm for 5min to collect the precipitate, washed several times with deionized water and alcohol. Dry in a blast drying oven at 50°C for 24 hours before use.

[0029] (2) the leaf-shaped nano-α-Fe obtained in (1) 2 o 3 The sample was placed in a tube furnace and heat-treated at 300°C for 1 hour in a reducing hydrogen and argon mixed gas environment to obtain leaf-shaped nano-Fe 3 o4 Absorbing material. In the heat treatment process, the flows of hydrogen and argon in the mixed gas of hydrogen and argon used to reduce α-Fe2O3 are 10ml / min and 120ml / min respectively.

[0030] (3) the leaf-shap...

Embodiment 3

[0033] (1) Dissolve 2.63g of potassium ferricyanide in 80mL of deionized water and stir magnetically for 1 hour; to obtain a potassium ferricyanide solution, pour the obtained red solution into a 100mL polytetrafluoroethylene reactor liner, seal it into a stainless steel In the shell, hydrothermal reaction at 150°C for 48 hours to obtain leaf-shaped nano-α-Fe 2 o 3 , centrifuged at 9000rpm for 15min to collect the precipitate, washed several times with deionized water and alcohol. Dry in a blast oven at 80°C for 24 hours before use.

[0034] (2) the leaf-shaped nano-α-Fe obtained in (1) 2 o 3 The sample was placed in a tube furnace and heat-treated at 500°C for 2 hours in a reducing hydrogen and argon mixed gas environment to obtain leaf-shaped nano-Fe 3 o 4 Absorbing material. In the heat treatment process, the flows of hydrogen and argon in the mixed gas of hydrogen and argon used to reduce α-Fe2O3 are 10ml / min and 120ml / min respectively.

[0035] (3) the leaf-shaped ...

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Abstract

The invention discloses a preparation method of a honeycomb sandwich structured wave-absorbing composite filled with leaf-like nano-Fe3O4, and relates to the technical field of electromagnetic stealthcomposites. According to the method, leaf-like alpha-Fe3O4 is synthesized from potassium ferricyanide as a raw material with a hydrothermal method; leaf-like alpha-Fe3O4 is reduced into leaf-like nano-Fe3O4 with a high-heat treatment method, honeycomb holes of a periodic aramid honeycomb board are filled with leaf-like nano-Fe3O4, the upper side and the lower side of the honeycomb board are covered with glass fiber reinforced resin based composite skin and carbon fiber reinforced resin based composite skin respectively, and the honeycomb sandwich structured wave-absorbing composite filled with leaf-like nano-Fe3O4 is obtained. The effective absorption frequency bandwidth at the thickness of 4 mm is 2.6 GHz (in the frequency band range of 12.8 GHz-15.4 GHz), and the maximum absorption strength at 14.2 GHz reaches -36 dB. The technical problems of poor electromagnetic wave absorption intensity and poor mechanical bearing capacity of a traditional wave absorption material 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 leaf-shaped nano Fe3O4. 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 electromagnetic wave absorbing materi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K3/00C01G49/08B82Y30/00B82Y40/00
CPCC09K3/00C01G49/08B82Y30/00B82Y40/00C01P2004/03C01P2004/61
Inventor 李宜彬杨明龙袁野赫晓东尹维龙李建军
Owner SHENZHEN STRONG ADVANCED MATERIALS RES INST CO LTD
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