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Zirconium-doped barium ferrite wave-absorbing material and preparation method thereof

A technology of barium ferrite and wave-absorbing materials, which is applied in the field of zirconium-doped barium ferrite wave-absorbing materials and its preparation, can solve the problem that barium ferrite has a small dielectric loss value, which is not conducive to the popularization and application of materials, modulation and Problems such as application capacity limitations, to achieve the effect of low cost, reduced matching thickness, and widened application frequency band

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, due to the modulation of the magnetocrystalline anisotropy on the one hand and the Ti 4+ The doping amount is related, on the other hand, it is more critical to use Ti 4+ replace Fe 3+ However, limited by the specific intrinsic characteristics of Ti ions, the frequency of this titanium-doped absorbing material can be adjusted in the range of 26.5-40 GHz. Obviously, the modulation and application capabilities in a larger frequency range are limited to a certain extent.
In addition, the dielectric loss value of Ti-doped barium ferrite is relatively small, so that the matching thickness of Ti-doped ferrite is about 2.8 mm, which is not conducive to the popularization and application of this material
At present, there is no report on the absorbing material with both a wide absorbing frequency band and a thin matching thickness.

Method used

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  • Zirconium-doped barium ferrite wave-absorbing material and preparation method thereof
  • Zirconium-doped barium ferrite wave-absorbing material and preparation method thereof
  • Zirconium-doped barium ferrite wave-absorbing material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1) Mix barium nitrate, iron nitrate and zirconium nitrate at a molar ratio of 1:11.5:0.5, add deionized water and stir for 3 h to dissolve to obtain a nitrate solution, in which the total molar concentration of barium nitrate, iron nitrate and zirconium nitrate is 1.5mol / L;

[0024] 2) Put EDTA in deionized water, stir at 80°C until completely dissolved, the molar concentration of EDTA is 0.5mol / L, then adjust the pH value to 5 with ammonia water to obtain EDTA solution;

[0025] 3) Add the nitrate solution to the EDTA solution drop by drop, where 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 80°C to obtain a sol; dry the obtained sol at 100°C , to obtain a fluffy xerogel;

[0026] 4) Put the dry gel in a muffle furnace, keep it at 230°C for 4.5 hours, then raise the temperature to 460°C at a rate of 3°C / min and keep it for 4.5 hours, then raise the temperature to 800°C at a rate of 5°C / m...

Embodiment 2

[0031] 1) Mix barium nitrate, ferric nitrate and zirconium nitrate at a molar ratio of 1:11.6:0.4, add deionized water and stir for 3.5 h to dissolve to obtain a nitrate solution, in which the total molar concentration of barium nitrate, ferric nitrate and zirconium nitrate is 2.0mol / L;

[0032] 2) Put EDTA in deionized water, stir at 85°C until completely dissolved, the molar concentration of EDTA is 1.0mol / L, and adjust the pH value to 6 with ammonia water to obtain EDTA solution;

[0033] 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;

[0034] 4) Put the dry gel in a muffle furnace, keep it at 240°C for 3 hours, then raise the temperature to 470°C at a rate of 4°C / min and keep it for 3 hours, then raise the temperature to 700°C at a rate of 10°C / min and k...

Embodiment 3

[0039] 1) Mix barium nitrate, ferric nitrate and zirconium nitrate at a molar ratio of 1:11.7:0.3, add deionized water and stir for 4 h to dissolve to obtain a nitrate solution, in which the total molar concentration of barium nitrate, ferric nitrate and zirconium nitrate is 2.5mol / L;

[0040] 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;

[0041] 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;

[0042] 4) Put the dry gel in a muffle furnace, keep it at 250°C for 1.5 hours, then raise the temperature to 480°C at a rate of 5°C / min and keep it for 1.5 hours, then raise the temperature to 600°C at a rate of 10°C / min and ...

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Abstract

The invention discloses a zirconium-doped barium ferrite wave-absorbing material having a chemical formula of BaFe12-xZrxO19, wherein x is 0.3-0.5, zirconium-doped barium ferrite is a polycrystalline powder, and Fe<3+> and Fe<2+> exist in the barium ferrite simultaneously. A preparation method comprises the preparation steps: mixing barium nitrate, iron nitrate and zirconium nitrate, adding deionized water, and dissolving into a nitrate solution; placing EDTA in deionized water, and dissolving into an EDTA solution; adding the nitrate solution into the EDTA solution, heating, drying, and thus obtaining a dry gel; and sintering the dry gel to obtain a zirconium-doped barium ferrite powder, then grinding, and thus obtaining the zirconium-doped barium ferrite wave-absorbing material. The wave-absorbing material has the characteristics of thin matching thickness and wide wave-absorbing frequency band, can be used for a wave-absorbing coating layer, and can have wide applications in the electromagnetic shielding and stealth fields.

Description

technical field [0001] The invention relates to a wave-absorbing material and a preparation method thereof, in particular to a zirconium-doped barium ferrite wave-absorbing material and a preparation method thereof. Background technique [0002] As stealth technology is widely used in military fields such as missiles, aircraft, and ships, it has become one of the indispensable high-tech for military modernization. However, the rapid development of monitoring technology such as radar has put forward new requirements for modern stealth technology. As one of the frontier topics in stealth technology, absorbing materials need to develop in the direction of large absorbing loss, wide absorbing frequency, light weight and thin thickness. In addition, with the development of electronic information technology, electromagnetic pollution has become an urgent problem to be solved in today's society. It can be seen that absorbing materials have important research significance in both ...

Claims

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Application Information

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IPC IPC(8): C04B35/26C04B35/622C09K3/00
Inventor 杜丕一刘初阳马宁韩高荣翁文剑
Owner ZHEJIANG UNIV
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