Method for improving electromagnetic wave absorption performance of Fe-Si-Al powder

A technology of fe-si-al and absorption performance, which is applied in the direction of magnetism of inorganic materials, can solve the problems that the absorption performance of electromagnetic waves cannot be brought into play, the absorption performance cannot be improved well, and the dielectric constant can be reduced, so as to improve the anti-corrosion Electromagnetic interference ability, improvement of microwave absorption performance, and effect of reducing dielectric constant

Inactive Publication Date: 2012-07-04
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, due to the high electrical conductivity of this type of alloy, this type of alloy has a dielectric constant much larger than the magnetic permeability, and the electromagnetic parameters (magnetic permeability and dielectric constant) are seriously mismatched in the design of the absorbing material, resulting in The potential electromagnetic wave absorption performance of this kind of material has not been brought into play
For this reason, people have tried to coat SiO on the surface of alloy powder in the early stage. 2 To improve the absorbing performance, and discover SiO 2 Coating not only reduces the dielectric constant, but also reduces the magnetic permeability to a certain extent, making SiO 2 Coating soft magnetic powder does not improve the microwave absorption performance very well

Method used

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  • Method for improving electromagnetic wave absorption performance of Fe-Si-Al powder
  • Method for improving electromagnetic wave absorption performance of Fe-Si-Al powder
  • Method for improving electromagnetic wave absorption performance of Fe-Si-Al powder

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preparation example Construction

[0024] Specifically, what the present invention provides is a method for preparing soft magnetic spinel ferrite coated with high resistivity on the flaky particles of a soft magnetic alloy Fe-Si-Al, comprising the following steps:

[0025] 1. Fe-Si-Al soft magnetic alloy powder (average diameter 1-100μm, thickness 0.1-5μm) after ball mill flattening treatment is used as an electromagnetic wave absorber that can work in the range of 0.5GHz-18GHz raw material.

[0026] 2. Take the powder in step 1 and add it to deionized water, and stir it quickly to make it fully dispersed in the aqueous solution.

[0027] 3. According to the coating of spinel ferrite, that is (Me1 x Me2 y Me3 z )Fe 2 o 4 Components, respectively configure the corresponding molar ratio of Me-containing mixed salt solution, Me1, Me2 and Me3 are respectively Ni 2+ 、Co 2+ , Zn 2+ 、Cu 2+ , Fe 2 One of them, Me1, Me2 and Me3 may be three different elements, or two of them may be the same element, or all th...

Embodiment 1

[0035] Example 1: NiFe 2 o 4 Coated flaky Fe-Si-Al soft magnetic powder

[0036] 1. Weigh 5.0g of flaky Fe-Si-Al soft magnetic powder and add it to 250ml of deionized water, and stir it mechanically quickly to make it evenly dispersed in the aqueous solution.

[0037] 2. Configure 0.3mol / LNiCl 2 and 0.6mol / LFeCl 2 Mixed solution 100ml, 1.8mol / L KOH strong alkali solution 100ml. Put the prepared mixed solution and strong alkali solution in the titration funnel respectively, and fix it on the iron stand.

[0038] 3. Place the container containing the dispersion solution in step 1 in a water bath, adjust the temperature at 80°C, let air flow into the bottom of the container and stir it mechanically quickly.

[0039] 4. Titrate the solutions of the two titration funnels in step 2 into the dispersion solution at a titration rate of 3ml / min at the same time.

[0040] 5. After the titration is completed, keep warm in a water bath at 80°C for 3 hours. After the reaction is fini...

Embodiment 2

[0042] Example 2: Ni 0.7 Zn0 .3 Fe 2 o 4 Coated flaky Fe-Si-Al soft magnetic powder

[0043] 1. Weigh 4.5g of flaky Fe-Si-Al soft magnetic powder and add it to 200ml of deionized water, and stir it mechanically quickly to make it evenly dispersed in the aqueous solution.

[0044] 2. Configure 0.14mol / L Ni(NO 3 ) 2 , 0.07mol / L Zn(NO 3 ) 2 and 0.4mol / L Fe(NO 3 ) 2 Mixed solution 80ml, 1.2mol / L NaOH strong alkali solution 80ml. Put the prepared mixed solution and strong alkali solution in the titration funnel respectively, and fix it on the iron stand.

[0045] 3. Place the container containing the dispersion solution in step 1 in a water bath, adjust the temperature at 25°C, and let air flow into the bottom of the container and stir it mechanically quickly.

[0046] 4. Titrate the solutions of the two titration funnels in step 2 into the dispersion solution at a titration rate of 1 ml / min at the same time.

[0047] 5. After the titration is finished, the modified Fe-...

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Abstract

A method for improving electromagnetic wave absorption performance of Fe-Si-Al powder relates to the technology of electromagnetic wave absorption and comprises the following steps: 1) performing ball mill flattening treatment on Fe-Si-Al soft magnetic alloy powder; 2) fast and mechanically stirring the powder obtained through the step 1) and scattering the powder into water and leading in air from the bottom of a container; 3) respectively preparing mixed salt solution with the corresponding molar ratio according to spinel ferrites to be wrapped, and preparing strong alkali solution according to the corresponding molar ratio; 4) stirring the scattered solution obtained by the step 2) under water bath heating at the temperature of 25-80 DEG C; 5) adding the salt solution and the strong alkali solution which are prepared through the step 3) into treated solution treated by the step 4); and 6) finishing reaction, cleaning the powder, drying and annealing. The method for improving the electromagnetic wave absorption performance of the Fe-Si-Al powder greatly reduces dielectric constant and simultaneously improves the microwave magnetic conductance of the powder.

Description

technical field [0001] The invention relates to electromagnetic wave absorbing technology. Background technique [0002] Traditional spinel ferrite absorbing materials have insufficient microwave complex magnetic permeability, so the electromagnetic wave absorbing coating prepared by using them is usually thicker. In addition, they also have the disadvantages of high density and poor temperature stability. The absorbent represented by flake metal soft magnetic alloy powder has a complex magnetic permeability much larger than that of spinel ferrite in the microwave frequency range. If they are used to prepare electromagnetic wave absorbers, the thickness of the wave-absorbing coating can be greatly reduced, and the temperature stability of the wave-absorbing coating can be greatly improved. However, due to the high electrical conductivity of this type of alloy, this type of alloy has a dielectric constant much larger than the magnetic permeability, and the electromagnetic pa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/02H01F1/33
Inventor 韩满贵蔡黎秦军锋邓龙江
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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