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Sendust electromagnetic wave absorbent and preparation method thereof

An electromagnetic wave and absorber technology, which is applied in the field of iron-silicon-aluminum electromagnetic wave absorber and its preparation, can solve the problems of improvement, unfavorable wave absorption performance, difficulty in satisfying free space impedance matching conditions, etc., and achieves the effect of good absorption effect.

Inactive Publication Date: 2019-04-26
XIHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the permittivity of the sendust absorber is much larger than its magnetic permeability, and it is difficult to meet the free space impedance matching condition: μ′-jμ″=ε′-jε″, which is not conducive to the improvement of the wave-absorbing performance

Method used

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  • Sendust electromagnetic wave absorbent and preparation method thereof
  • Sendust electromagnetic wave absorbent and preparation method thereof
  • Sendust electromagnetic wave absorbent and preparation method thereof

Examples

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preparation example Construction

[0022] A preparation method of sendust electromagnetic wave absorber, comprising:

[0023] Doping manganese-zinc ferrite into sendust powder, then ball-milling the doped mixture according to the material-ball ratio of 1:14-16, ball-milling for 5-50 hours, and drying to obtain sendust electromagnetic wave absorber. Manganese-zinc ferrite accounts for 0.5-5 at% of the iron-silicon-aluminum electromagnetic wave absorber, and the ratio of manganese-zinc ferrite is: 52-55 at% Fe 2 o 3 , 33-36at% MnO, 10-14at% ZnO.

[0024] specifically:

[0025] S1. Vacuum melting iron, silicon and aluminum into alloy ingots.

[0026] High-purity iron rods, silicon particles and aluminum ingots with a purity greater than 99.9% are used to prepare raw materials according to the proportions of 72.5-75.5at% Fe, 15-17.5at% Si, and 9.5-11.5at% Al, respectively, in a vacuum induction melting furnace Smelting alloys. The vacuum degree before smelting is less than 0.1Pa, and the vacuum degree is contr...

Embodiment 1

[0040] This embodiment provides a sendust electromagnetic wave absorber and a preparation method thereof.

[0041] A preparation method of sendust electromagnetic wave absorber, comprising:

[0042] High-purity iron rods, silicon particles and aluminum ingots with a purity greater than 99.9% are used to prepare raw materials at the ratio of 72.5at% Fe, 17.5at% Si, and 10at% Al respectively, and the alloy is melted in a vacuum induction melting furnace. The vacuum degree before smelting is less than 0.1Pa, and the vacuum degree is controlled to 1Pa during the capacity process to ensure that the vacuum requirement for raw materials in smelting is met. After smelting to obtain the melt, melt the melt for 2 minutes and pour it into ingots for crushing.

[0043] The alloy ingot obtained in S1 is preliminarily broken into particles with a particle size of about 100 μm in a crusher.

[0044] use and Three kinds of stainless steel balls are mixed, the alloy particles are place...

Embodiment 2- Embodiment 5

[0049] Example 2-Example 5 are basically the same as Example 1, except that the milling time of the manganese-zinc-ferrite and the sendust powder made by S5 in the ball mill is 15h, 25h, 35h, and 45h, respectively.

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Abstract

The invention relates to the technical field of electromagnetic wave absorption, and provides a preparation method of a sendust electromagnetic wave absorbent. The preparation method comprises the steps: manganese zinc ferrite and sendust alloy powder are mixed to be ball-milled, wherein the ratio of milled materials to milling media is 1:(14 to 16), and ball milling is conducted for 5-50 h; and then drying is conducted to obtain the sendust electromagnetic wave absorbent, wherein the manganese zinc ferrite accounts for 0.5-5at% of the sendust electromagnetic wave absorbent, and the manganesezinc ferrite is prepared from the components in percentage by atom: 52-55% of Fe2O3, 33-36% of MnO and 10-14% of ZnO. According to the preparation method, the manganese zinc ferrite is doped in the sendust alloy powder with the reasonable content, and the reasonable ball milling time is selected in the mixed ball milling process of the manganese zinc ferrite and the sendust alloy powder, so that the prepared sendust electromagnetic wave absorbent has a good absorption effect on electromagnetic waves. The invention further provides the sendust electromagnetic wave absorbent prepared through thepreparation method. The sendust electromagnetic wave absorbent has good absorption performance on the electromagnetic waves.

Description

technical field [0001] The invention relates to the technical field of electromagnetic wave absorption, in particular to a sendust electromagnetic wave absorber and a preparation method thereof. Background technique [0002] At present, the wide application of electronic products has brought about increasingly severe electromagnetic interference problems. People are also constantly developing new materials and optimizing existing absorbers to improve the wave-absorbing performance. At the same time, as an important foundation of stealth technology, microwave-absorbing materials are also important military basic materials that various countries are competing to study. The currently used absorbents mainly include metal powders, ferrite series, polycrystalline iron fibers, and nanomaterials. Due to its high initial permeability and saturation magnetization, metal powder has excellent high-frequency performance, so it is an ideal absorbing material. The sendust powder in the m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05K9/00
CPCH05K9/0081
Inventor 周廷栋刘文斌薛建宋天秀谢晓燕
Owner XIHUA UNIV
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