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A kind of preparation method of fesial alloy fine powder electromagnetic absorber

An absorber and alloy technology, applied in the direction of metal processing equipment, electrical components, instrument parts, etc., can solve problems such as difficult to achieve microwave absorption performance, affect material microwave absorption performance, and reduce material magnetic permeability, etc., to achieve suitable for large Large-scale production, simple and easy operation method, and the effect of not reducing the microwave magnetic permeability

Active Publication Date: 2018-04-06
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the high dielectric coefficient of the alloy powder after flaking in the microwave frequency range (0.5-18 GHz) makes it difficult to achieve impedance matching, which affects the realization of the material's microwave-absorbing performance.
At present, the FeSiAl absorber volume content is 35%, and the auxiliary material is paraffin as the electromagnetic wave absorbing material. In the microwave frequency range of 0.5-18 GHz, the maximum value of the real part of the magnetic permeability μ' max About 3.5, the imaginary peak value μ' m ' ax About 2.8, the maximum value of the real part of the permittivity ε' max Greater than 80, the maximum imaginary part ε' m ' ax Greater than 150, impedance matching is difficult, and it is difficult to achieve microwave absorption performance
In the existing research, for the problem of excessively high dielectric of metal micropowder materials, most of them adopt the method of coating with low dielectric constant materials, the process is relatively complicated, and the magnetic permeability of the material will be reduced.

Method used

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  • A kind of preparation method of fesial alloy fine powder electromagnetic absorber
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  • A kind of preparation method of fesial alloy fine powder electromagnetic absorber

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Experimental program
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Effect test

Embodiment 1

[0017] The raw material used is flaky FeSiAl micropowder, and the composition is Fe: 75% in molar ratio; Si: 15%; Al: 10%. When the volume percentage of the absorbent is 35%, and the auxiliary material is paraffin, when it is made into an electromagnetic wave absorbing material, in the frequency band of 0.5-18GHz, the magnetic permeability μ' max 5.0, μ' m ' ax is 2.8, and the real and imaginary parts of the effective permittivity have maximum values ​​at 0.5GHz, which are ε' max is 160, the imaginary part ε' m ' ax for 547. For detailed data, see figure 1 .

[0018] The raw material is subjected to atmosphere heat treatment, and the volume ratio of the mixed atmosphere is: N 2 :75;H 2 : 2%; Ar: 23%.

[0019] The heating rate is 8°C / min, the holding temperature is 400°C, and the holding time is 2h. Then carry out natural cooling in atmosphere protection.

[0020] According to the above steps, the electromagnetic wave absorber can be obtained. When the volume content...

Embodiment 2

[0022] The raw material used is flaky FeSiAl micropowder, and the composition is Fe: 75% in molar ratio; Si: 15%; Al: 10%. When the volume percentage of the absorbent is 35%, and the auxiliary material is paraffin, when it is made into an electromagnetic wave absorbing material, in the frequency band of 0.5-18GHz, the magnetic permeability μ' max 5.0, μ' m ' ax is 2.8, and the real and imaginary parts of the effective permittivity have maximum values ​​at 0.5GHz, which are ε' max is 160, the imaginary part ε' m ' ax for 547. For detailed data, see figure 2 .

[0023] The raw material is subjected to atmosphere heat treatment, and the volume ratio of the mixed atmosphere is: N 2 : 90%; H 2 : 2%; Ar: 8%.

[0024] The heating rate is 8°C / min, the holding temperature is 700°C, and the holding time is 1h. Then carry out natural cooling in atmosphere protection.

[0025] According to the above steps, the electromagnetic wave absorber can be obtained. When the volume cont...

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Abstract

The invention belongs to the technical field of electronic materials, in particular to a preparation method of FeSiAl alloy fine powder electromagnetic absorber. In the present invention, the electromagnetic absorber described in the present invention can be obtained by charging FeSiAl alloy fine powder into a tube furnace, introducing a protective atmosphere, and then performing heat treatment. The absorbent is compounded with the auxiliary material at a volume ratio of 28.5% to 35%. When it is prepared as an electromagnetic wave absorbing material, it can ensure that the microwave magnetic permeability of the material does not decrease, and at the same time significantly reduce the effective dielectric constant of the material, which is better. Realize impedance matching and improve absorbing performance. And the operation method is simple and easy, the cost is lower than the prior art, and it is suitable for large-scale production.

Description

technical field [0001] The invention belongs to the technical field of electronic materials, and relates to the complex magnetic permeability and complex permittivity of an alloy micropowder absorbent used in a microwave band (0.5-18GHz), in particular to a preparation method of a FeSiAl series alloy micropowder electromagnetic absorbent. Background technique [0002] Stealth technology is one of the major military technologies that emerged after World War II. In modern warfare, the electromagnetic environment is becoming more and more complex. As an effective means to improve the stealth ability of weapons and equipment, electromagnetic wave absorbing materials are increasingly valued by various military powers, and related research results are frequently published in newspapers. [0003] Among them, the research on absorbing materials is the basis of stealth technology. Compared with other stealth methods, it has the advantages of convenient use, wide application and low c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/06B22F1/00H05K9/00G12B17/02
CPCH05K9/0081G12B17/02C22C38/02C22C38/06B22F1/142
Inventor 谢欣桐张楠
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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