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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  • Summary
  • 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 oxidi

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

Examples

Experimental program
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Example Embodiment

[0023] The preparation method of the wave absorbing material provided in the present application includes the following steps: in the presence of grams of ammonium molybdate, a phthalocyanine precursor and carbonyl iron powder are made into a carbonyl iron powder composite with phthalocyanine molecules on the surface in a solvent. Specifically, a phthalocyanine precursor, gram ammonium molybdate, N-methylpyrrolidone, and carbonyl iron powder are mixed.

[0024] The first heat treatment is performed on the carbonyl iron powder composite coated with phthalocyanine molecules to form a first coating layer on the surface of the carbonyl iron powder.

[0025] The surface modification treatment of the carbonyl iron powder with the first coating layer (also called graphene-coated carbonyl iron powder) is carried out with the silane coupling agent solution, (drying), and then the second heat treatment is performed. A second coating layer is formed on the surface of the carbonyl iron powder ...

Example Embodiment

[0052] Example 1

[0053] A high-energy planetary ball mill was used to ball mill the carbonyl iron for 5 hours, and the inside of the ball mill was protected by nitrogen gas. After the ball milling, it was taken out and sieved with a 300-mesh screen to obtain flake carbonyl iron powder.

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

[0055] After stirring the phthalocyanine precursor, grams of ammonium molybdate and N-methylpyrrolidone for 1.5 hours at 180°C, the solution...

Example Embodiment

[0060] Example 2

[0061] A high-energy planetary ball mill was used to ball mill the carbonyl iron for 10 hours. The inside of the ball mill was protected by nitrogen gas. After the ball milling, it was taken out and sieved with a 300 mesh screen to obtain flake carbonyl iron powder.

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

[0063] After stirring the phthalocyanine precursor, grams of ammonium molybdate and N-methylpyrrolidone for 2 hours at 175℃, the solution turne...

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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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