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Wave absorption material and preparation method thereof

A microwave-absorbing material, carbonyl iron powder technology, applied in the field of microwave-absorbing materials, can solve the problems of large fluctuations in dielectric constant and magnetic permeability, unstable metal powder, poor thermal stability, etc., to improve high-temperature microwave absorption The performance and preparation method are simple and feasible, and the effect of excellent high temperature resistance

Active Publication Date: 2019-01-22
AEROSPACE SCI & IND WUHAN MAGNETISM ELECTRON
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Conventional absorbing materials mainly use metal powder as the absorbing matrix, and metal powder is very unstable under high temperature conditions and is prone to oxidation
[0003] The wave-absorbing materials in the prior art have at least the following problems: easy to be oxidized by the outside air, poor high temperature resistance; oxidation, porosity, delamination and other problems are prone to occur under high temperature conditions, resulting in the dielectric constant and magnetic permeability of the material Large fluctuations and poor thermal stability

Method used

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  • Wave absorption material and preparation method thereof
  • Wave absorption material and preparation method thereof
  • Wave absorption material and preparation method thereof

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preparation example Construction

[0023] The preparation method of the absorbing material provided by the application includes the following steps: in the presence of gram of ammonium molybdate, a phthalocyanine precursor and carbonyl iron powder are prepared in a solvent to form a carbonyl iron powder composite with phthalocyanine molecules coated on the surface. Specifically, a phthalocyanine precursor, ammonium molybdate, N-methylpyrrolidone, and carbonyl iron powder were mixed.

[0024] The first heat treatment is carried out on the carbonyl iron powder composite coated with phthalocyanine molecules on the surface, and the first coating layer is formed on the surface of the carbonyl iron powder.

[0025] Utilize silane coupling agent solution to carry out surface modification treatment to the carbonyl iron powder body (also can be referred to as graphene coating carbonyl iron powder body) with the first cladding layer, (dry), carry out second heat treatment subsequently, in A second coating layer is formed...

Embodiment 1

[0053] The carbonyl iron was ball-milled for 5 hours with a high-energy planetary ball mill, wherein the interior of the ball mill was protected by nitrogen gas, and the ball mill was taken out after the ball mill was completed, and sieved with a 300-mesh screen to obtain flaky carbonyl iron powder.

[0054] Add biphenol, 4-nitrophthalonitrile, and anhydrous potassium carbonate to N,N-dimethylformamide respectively according to the mass ratio of 1:2:1.5, and then dissolve them in 60°C Stir in a water bath for 11.5 hours. After stirring, put it into 30% hydrochloric acid and stir for 4 hours, then perform suction filtration, rinse repeatedly with deionized water, and place the filter in a vacuum oven at a drying temperature of 60°C and vacuum Dry for 6 hours under the condition that the pressure is less than -0.1MPa to obtain a phthalocyanine precursor.

[0055] After stirring the phthalocyanine precursor, ammonium molybdate and N-methylpyrrolidone at 180°C for 1.5h, the soluti...

Embodiment 2

[0061] The carbonyl iron was ball-milled for 10 hours by using a high-energy planetary ball mill, wherein the inside of the ball mill was protected by nitrogen gas, and the ball mill was taken out after the ball milling was completed, and sieved by a 300-mesh sieve to obtain flaky carbonyl iron powder.

[0062] Add biphenol, 4-nitrophthalonitrile, and anhydrous potassium carbonate to N,N-dimethylformamide respectively according to the mass ratio of 1:2.5:2, and then dissolve them in 55°C Stir in a water bath for 13 hours. After the stirring is completed, put it into 30% hydrochloric acid and stir for 3 hours, then perform suction filtration, rinse repeatedly with deionized water, and place the filter in a vacuum oven at a drying temperature of 70°C and a vacuum pressure. Dry for 4.5 hours under the condition of less than -0.1MPa to obtain a phthalocyanine precursor.

[0063] After stirring the phthalocyanine precursor, ammonium molybdate and N-methylpyrrolidone at 175°C for 2 ...

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Abstract

The invention relates to a wave absorption material and a preparation method thereof, and belongs to the technical field of wave absorption materials. The preparation method comprises the following steps: in the presence of ammonium molybdate, preparing a phthalocyanine precursor and carbonyl iron powder into a carbonyl iron powder compound of which the surface is coated with phthalocyanine molecules in a solvent; performing heat treatment on the carbonyl iron powder compound of which the surface is coated with phthalocyanine molecules for the first time, and forming a first coating layer on the surface of the carbonyl iron powder; and then, performing surface modification treatment by using a silane coupling agent solution, performing heat treatment for the second time, and forming a second coating layer on the surface of the carbonyl iron powder, thereby obtaining the wave absorption material. The method is simple and feasible, can realize continuous production, is low in productioncost, can greatly enhance the heat resistance of the wave absorption material, and can improve the high-temperature wave absorption performance of the wave absorption material. The prepared wave absorption material can be used for 100 hours at 300 DEG C, can be used for 48 hours at 400 DEG C and can be used for 24 hours at 500 DEG C, and the change rates of the dielectric constant and the magneticconductivity of the wave absorption material are less than 5%.

Description

technical field [0001] The invention belongs to the technical field of wave-absorbing materials, and in particular relates to a wave-absorbing material and a preparation method thereof. Background technique [0002] Conventional microwave-absorbing materials mainly use metal powder as the microwave-absorbing matrix, and metal powder is very unstable under high temperature conditions and is prone to oxidation. [0003] The wave-absorbing materials in the prior art have at least the following problems: easy to be oxidized by the outside air, poor high temperature resistance; oxidation, porosity, delamination and other problems are prone to occur under high temperature conditions, resulting in the dielectric constant and magnetic permeability of the material The change fluctuates greatly and the thermal stability is poor. Contents of the invention [0004] One of the objectives of the present invention is to provide a method for preparing a wave-absorbing material, which is ...

Claims

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Application Information

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IPC IPC(8): C09K3/00
CPCC09K3/00
Inventor 陈路朱时霖龙昌王锦王浩继王建国
Owner AEROSPACE SCI & IND WUHAN MAGNETISM ELECTRON
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