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A kind of electromagnetic wave absorber and preparation method thereof

An absorbent and electromagnetic wave technology, applied in chemical instruments and methods, electrical components, and other chemical processes, can solve the problem of single absorption frequency band, achieve simple preparation process, improve impedance matching, and increase absorption bandwidth.

Inactive Publication Date: 2021-02-19
XIHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the existing absorbing materials use a single component, so their absorption frequency band is relatively single.

Method used

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  • A kind of electromagnetic wave absorber and preparation method thereof
  • A kind of electromagnetic wave absorber and preparation method thereof
  • A kind of electromagnetic wave absorber and preparation method thereof

Examples

Experimental program
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preparation example Construction

[0034] Preparation methods include:

[0035] Step S101 , respectively providing a first powder made of sendust and a second powder made of manganese zinc ferrite.

[0036] The above-mentioned first powder and second powder can be obtained by appropriate processing of commercially available sendust and manganese zinc ferrite.

[0037] Among them, sendust can be prepared by metallurgical process. Simple and easy, in the embodiment of the present invention, the first powder is made of sendust powder through ball milling.

[0038] For example, elemental iron, elemental silicon, and elemental aluminum are used to prepare sendust aluminum alloy powder through a gas atomization method. The amount of the elemental metal of sendust is compounded according to the element ratio of the first powder. For example, 100g of sendust powder is made by ball milling 85g of iron, 9.6g of silicon and 5.4g of aluminum. Before using sendust, the oxide layer can usually be removed, such as acid et...

Embodiment 1

[0058] 1) Preparation of flaky FeSiAl alloy powder: the alloy powder was prepared by gas atomization, the alloy components were 85wt% Fe, 9.6wt% Si, 5.4wt% Al, and the purity of the three raw materials was higher than 99.9%. Weigh 30g of 100-mesh sieved powder, add appropriate amount of alcohol to wet mill for 30 hours according to the ratio of ball to material ratio of 20:1, dry at 60°C, and sieve with 250-mesh sieve to obtain flaky FeSiAl alloy powder.

[0059] 2) Preparation of MnZn ferrite powder: the ratio of each component is 69.4wt% Fe2O3, 15.4wt% Mn3O4, 15.2wt% ZnO. The purity of the three oxides is higher than 99.9% for Fe2O3, higher than 98.5% for Mn3O4, and higher than 99.5% for ZnO. Add appropriate amount of deionized water to the above mixture according to the ratio of ball to material ratio of 15:1, and wet mill for 3 hours. Then the mixed slurry was dried at 120°C, then heated to 950°C for pre-calcination, and kept for 2 hours. Add appropriate amount of deioni...

Embodiment 2

[0063] This implementation provides an electromagnetic wave absorbing material, the manufacturing steps of which are the same as those of Example 1, the main difference is that in step 3), the ratio of flake FeSiAl alloy powder and MnZn ferrite powder is changed to 1:1.

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Abstract

An electromagnetic wave absorber and a preparation method thereof belong to the field of electromagnetic wave absorption. The electromagnetic wave absorber mainly includes composite first powder and second powder. Among them, the first powder is made of iron-silicon aluminum alloy and its element composition is: 85wt% Fe, 9.6wt% Si, 5.4wt% Al; the second powder is made of manganese zinc ferrite and its composition is: 69.4 wt% Fe 2 o 3 , 15.4wt% Mn 3 o 4 , 15.2 wt% ZnO. The electromagnetic wave absorber has a lower dielectric constant and a higher magnetic permeability, which is beneficial to the electromagnetic wave composite absorber designed for impedance matching. The preparation method of the electromagnetic wave absorber is simple and easy, and the use frequency band of the FeSiAl absorber is widened.

Description

technical field [0001] The invention relates to the field of electromagnetic wave absorption, in particular to an electromagnetic wave absorber and a preparation method thereof. Background technique [0002] Nowadays, the widespread use of various electronic products has brought serious electromagnetic interference. People try to solve this problem by constantly developing new absorbing materials with excellent performance. [0003] Absorbents used as wave-absorbing materials mainly include ferrite series, metal powder, and polycrystalline iron fiber. Among them, metal powder has a great potential for use in the microwave frequency band due to its high initial magnetic permeability and saturation magnetization. However, most of the existing absorbing materials use a single component, so their absorption frequency band is relatively single. [0004] The information disclosed in this background section is only intended to enhance the understanding of the general background ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K3/00H05K9/00
CPCC09K3/00H05K9/0081
Inventor 周廷栋刘文斌宋天秀蔡擎
Owner XIHUA UNIV
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