Multi-resonance absorption zirconium-doped barium ferrite broadband wave-absorbing material and preparation method thereof

A barium ferrite and resonance absorption technology is applied in the field of multi-resonance absorption barium ferrite wave absorbing material and its preparation field, which can solve the problems such as the inability to further widen the frequency bandwidth and the widening of the wave absorbing frequency band, and reduce the magnetic crystal The effect of anisotropic field, widening absorption bandwidth, and good application prospect

Active Publication Date: 2014-09-10
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for the above-mentioned titanium-doped barium ferrite absorbing material, the further broadening of the absorbing frequency band has not been achieved, mainly because it is controlled by the modulation of the absorbing frequency range of the composite two-phase material itself, and the titanium-doped barium ferrite The modulation frequency range of the bulk absorbing material is only about 12~14GHz from 40GHz to 28GHz, and this is just the absorbing bandwidth of the single-phase material itself, so even if the multi-resonance absorption is realized in this system, the frequency The width cannot be further widened

Method used

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  • Multi-resonance absorption zirconium-doped barium ferrite broadband wave-absorbing material and preparation method thereof
  • Multi-resonance absorption zirconium-doped barium ferrite broadband wave-absorbing material and preparation method thereof
  • Multi-resonance absorption zirconium-doped barium ferrite broadband wave-absorbing material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1. Preparation of BaFe 11.9 Zr 0.1 o 19

[0032] 1) Mix barium nitrate, zirconium nitrate and iron nitrate at a molar ratio of 1:0.1:11.9, add deionized water and stir for 3 h to dissolve to obtain a nitrate solution; the total molar concentration of barium nitrate, iron nitrate and zirconium nitrate is 1.5 mol / L;

[0033] 2) Put EDTA in deionized water, the molar concentration of EDTA is 0.5mol / L, stir at 80°C until completely dissolved, then adjust the pH value to 5 with ammonia water to obtain EDTA solution;

[0034] 3) Add the nitrate solution dropwise to the EDTA solution, the molar ratio of EDTA to the total amount of metal ions in the nitrate solution is 5:1, and continue to heat and stir at 80 °C to obtain a sol; dry the obtained sol at 100 °C, Obtain a fluffy xerogel;

[0035] 4) Finally, place the dry gel in a muffle furnace at 230°C for 4.5 hours, then raise the temperature to 460°C at a rate of 3°C / min for 4.5 hours, and then raise the temperature to 60...

Embodiment 2

[0045] 1. Preparation of BaFe 11.8 Zr 0.2 o 19

[0046] 1) Mix barium nitrate, zirconium nitrate and iron nitrate at a molar ratio of 1:0.2:11.8, add deionized water and stir for 3.5 h to dissolve to obtain a nitrate solution; the total molar concentration of barium nitrate, iron nitrate and zirconium nitrate is 2.0 mol / L;

[0047] 2) Put EDTA in deionized water, stir at 85°C until completely dissolved, the molar concentration of EDTA is 1.0mol / L, then adjust the pH value to 6 with ammonia water to obtain EDTA solution;

[0048] 3) Add the nitrate solution to the EDTA solution drop by drop, the molar ratio of EDTA to the total amount of metal ions in the nitrate solution is 5:1, and continue heating and stirring at 85 °C to obtain a sol; dry the obtained sol at 140 °C, Obtain a fluffy xerogel;

[0049] 4) Finally, place the dry gel in a muffle furnace at 240°C for 3 hours, then raise the temperature to 470°C at a rate of 4°C / min for 3 hours, and then raise the temperature...

Embodiment 3

[0059] 1. Preparation of BaFe 11.8 Zr 0.2 o 19

[0060] 1) Mix barium nitrate, zirconium nitrate and iron nitrate at a molar ratio of 1:0.2:11.8, add deionized water and stir for 4 h to dissolve to obtain a nitrate solution; the total molar concentration of barium nitrate, iron nitrate and zirconium nitrate is 2.5 mol / L;

[0061] 2) Put EDTA in deionized water, stir at 90°C until completely dissolved, the molar concentration of EDTA is 1.5mol / L, then adjust the pH value to 7 with ammonia water to obtain EDTA solution;

[0062] 3) Add the nitrate solution dropwise to the EDTA solution, the molar ratio of EDTA to the total amount of metal ions in the nitrate solution is 5:1, and continue heating and stirring at 90 °C to obtain a sol; dry the obtained sol at 120 °C, Obtain a fluffy xerogel;

[0063] 4) Finally, place the dry gel in a muffle furnace at 250°C for 1.5 hours, then raise the temperature to 480°C at a rate of 5°C / min for 1.5 hours, and then raise the temperature t...

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Abstract

The invention discloses a multi-resonance absorption zirconium-doped barium ferrite broadband wave-absorbing material having an expression formula of xBaZr[n]Fe[12-n]O[19]+(1-x)BaZr[m]Fe[12-m]O[19], wherein x is 0.1-0.9, n is 0.1-0.2, m is 0.3-0.5, and m is not equal to n. A preparation process comprises the steps: preparing a BaZr[n]Fe[12-n]O[19] powder; preparing a BaZr[m]Fe[12-m]O[19] powder; and then mixing and grinding the BaZr[n]Fe[12-n]O[19] powder and the BaZr[m]Fe[12-m]O[19] powder. A composite system is formed by the materials having different intrinsic parameter peak values, intrinsic parameters in the formed wave-absorbing system have corresponding different characteristic resonance frequencies, the appearing range of the resonance frequency of the composite material is greater than the appearing ranges of the own resonance frequencies of the compositing single-phase materials. The wave-absorbing material can be widely applied to the corresponding electromagnetic protection and microwave stealth fields.

Description

technical field [0001] The invention relates to a multi-resonance absorbing barium ferrite wave-absorbing material and a preparation method thereof, in particular to a multi-resonance absorbing zirconium-doped barium ferrite broadband wave-absorbing material and a preparation method thereof. Background technique [0002] In recent years, with the rapid development of various radars, microwave communications, and radio frequency equipment, new requirements have been put forward for contemporary microwave-absorbing materials. In addition, the problem of electromagnetic wave pollution, the emergence of microwave stealth technology and microwave anechoic chambers have attracted widespread attention to microwave-absorbing materials. and in-depth research. Ferrite is a traditional wave-absorbing material. Because of its ferrimagnetic and dielectric properties, it has an important contribution to wave absorption in terms of both dielectric loss and magnetic loss. Moreover, ferrite ...

Claims

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Application Information

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IPC IPC(8): C04B35/26C04B35/626
Inventor 杜丕一刘初阳马宁韩高荣翁文剑
Owner ZHEJIANG UNIV
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