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

A technology of barium ferrite and wave-absorbing materials, which is applied in the field of multi-resonance absorbing barium ferrite wave-absorbing materials and its preparation, can solve the problems of broadening the wave-absorbing frequency band and the inability to further widen the bandwidth, and achieve broadening of the absorption frequency wide, reduce the magnetic crystal anisotropy field, and have good application prospects

Active Publication Date: 2015-06-17
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 ferric nitrate at a molar ratio of 1:0.1:11.9, add deionized water and stir for 3 hours to dissolve to obtain a nitrate solution; the total molar concentration of barium nitrate, ferric 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℃ until it is completely dissolved, and then adjust the pH value to 5 with ammonia water to obtain an 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 ℃ to obtain a sol; dry the resulting sol at 100 ℃, Get fluffy dry gel;

[0035] 4) Finally, put the dry gel in a muffle furnace at 230℃ for 4.5h, then at a rate of 3℃ / min to 460℃ for 4.5h, and then at a rate of 5℃ / min to 600℃ for 4.5h h, then heat up at a rat...

Embodiment 2

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

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

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

[0048] 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 85 ℃ to obtain a sol; dry the resulting sol at 140 ℃, Get fluffy dry gel;

[0049] 4) Finally, put the dry gel in a muffle furnace at 240°C for 3 hours, then at a rate of 4°C / min to 470°C for 3 hours, and then at a rate of 10°C / min to 700°C for 3 hours, Th...

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 hours 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) Place EDTA in deionized water, stir at 90°C until it is completely dissolved, the molar concentration of EDTA is 1.5mol / L, and then adjust the pH value to 7 with ammonia water to obtain an 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 to heat and stir at 90 ℃ to obtain a sol; dry the resulting sol at 120 ℃, Get fluffy dry gel;

[0063] 4) Finally, put the dry gel in a muffle furnace at 250°C for 1.5 hours, then heat up to 480°C at a rate of 5°C / min for 1.5 hours, and then at a rate of 10°C / min to 800°C for 1.5 hou...

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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 absorption barium ferrite wave absorbing material and a preparation method thereof, in particular to a multi-resonance absorption 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 types of radar, microwave communications, and radio frequency equipment, new requirements have been put forward for contemporary absorbing materials. In addition, electromagnetic wave pollution, the emergence of microwave stealth technology and microwave anechoic chambers have attracted widespread attention. And in-depth research. Ferrite is a traditional absorbing material. Due to its both ferrimagnetic and dielectric properties, it has an important contribution to absorbing both in terms of dielectric loss and magnetic loss. The ferrite is cheap and the preparation process is simple. It has excellent abs...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/34C04B35/26C04B35/626
Inventor 杜丕一刘初阳马宁韩高荣翁文剑
Owner ZHEJIANG UNIV
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