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Zirconium and titanium-co-doped barium ferrite wave-absorbing powder material and preparation method therefor

A technology of barium ferrite and powder materials, which is applied in the field of zirconium-titanium co-doped barium ferrite wave-absorbing powder materials and its preparation, can solve the problems of low matching layer thickness and difficulty in achieving it, and achieve reduced matching Thickness, saving energy, enhancing the effect of bimodal effect

Active Publication Date: 2015-08-19
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is to say, it is difficult to achieve the purpose of making this material not only ensure the characteristics of low matching layer thickness, but also have the characteristics of wider modulation absorption frequency range

Method used

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  • Zirconium and titanium-co-doped barium ferrite wave-absorbing powder material and preparation method therefor
  • Zirconium and titanium-co-doped barium ferrite wave-absorbing powder material and preparation method therefor
  • Zirconium and titanium-co-doped barium ferrite wave-absorbing powder material and preparation method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1) Mix barium nitrate, ferric nitrate, zirconium nitrate and citric acid in a molar ratio of 1:11.6:0.2:18.6, add deionized water and stir for 3 h to dissolve to obtain metal salt solution A, in which barium nitrate, ferric nitrate and zirconium nitrate The total molar concentration is 1.5 mol / L;

[0026] 2) Tetrabutyl titanate and citric acid were mixed and dissolved in absolute ethanol at a molar ratio of 1:2 to obtain solution B; the molar concentration of tetrabutyl titanate was 0.05 mol / L.

[0027] 3) Solution B was slowly added to solution A and stirred for 1 h, and the pH value of the solution was adjusted to 6 to obtain solution C; the molar ratio of tetrabutyl titanate to barium nitrate in solution C was 0.2:1.

[0028] 4) Move the solution C to a clean stainless steel vessel, place it on an electronic universal furnace, adjust the power to 600w, and perform self-propagating combustion to obtain the precursor powder;

[0029] 5) Add the precursor powder in ste...

Embodiment 2

[0034] 1) Mix barium nitrate, ferric nitrate, zirconium nitrate and citric acid in a molar ratio of 1:11.4:0.3:18.7, add deionized water and stir for 4 h to dissolve to obtain metal salt solution A, in which barium nitrate, ferric nitrate and zirconium nitrate The total molar concentration is 2.0 mol / L;

[0035] 2) Tetrabutyl titanate and citric acid were mixed and dissolved in absolute ethanol at a molar ratio of 1:2 to obtain solution B; the molar concentration of tetrabutyl titanate was 0.1mol / L.

[0036] 3) Solution B was slowly added to solution A and stirred for 2 h, and the pH value of the solution was adjusted to 7 to obtain solution C; the molar ratio of tetrabutyl titanate to barium nitrate in solution C was 0.3:1.

[0037] 4) Move the solution C to a clean stainless steel vessel, place it on an electronic universal furnace, adjust the power to 700w, and perform self-propagating combustion to obtain the precursor powder;

[0038] 5) Add the precursor powder in step ...

Embodiment 3

[0043] 1) Mix barium nitrate, ferric nitrate, zirconium nitrate and citric acid in a molar ratio of 1:11.2:0.4:18.8, add deionized water and stir for 5 h to dissolve to obtain metal salt solution A, in which barium nitrate, ferric nitrate and zirconium nitrate The total molar concentration is 2.5 mol / L;

[0044] 2) Tetrabutyl titanate and citric acid were mixed and dissolved in absolute ethanol at a molar ratio of 1:2 to obtain solution B; the molar concentration of tetrabutyl titanate was 0.15 mol / L.

[0045] 3) Solution B was slowly added to solution A and stirred for 3 h, and the pH value of the solution was adjusted to 8 to obtain solution C; the molar ratio of tetrabutyl titanate to barium nitrate in solution C was 0.4:1.

[0046] 4) Move the solution C to a clean stainless steel vessel, place it on an electronic universal furnace, adjust the power to 800w, and perform self-propagating combustion to obtain the precursor powder;

[0047] 5) Add the precursor powder in ste...

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Abstract

The invention discloses a zirconium and titanium-co-doped barium ferrite wave-absorbing powder material. The chemical formula is BaFe(12-x)ZrxTixO19, wherein x is equal to 0.2-0.4. The zirconium and titanium-co-doped barium ferrite is single-phase polycrystalline powder, and Fe<3+> and Fe<2+> exist in the barium ferrite at the same time. A preparation method comprises the following step of preparing the zirconium and titanium-co-doped barium ferrite wave-absorbing powder material by virtue of a self-propagating combustion method which is combined with ball-milling and a sequential secondary vacuum high-temperature thermal treatment process. The wave-absorbing material disclosed by the invention has the characteristics of being strong in absorption loss, wide in wave absorbing bandwidth, thin in match thickness and wide in modulated wave-absorbing frequency range. The effective wave absorbing bandwidth is controlled in a frequency range of 18-40GHz, double absorption peaks appear, the maximum absorbing bandwidth can reach 16GHz, the optimum match thickness is just about 1mm, and the optimum reflection loss RL value at the special frequency can reach about -48dB. The barium ferrite wave-absorbing powder material is simple in preparation process, can be used for a wave-absorbing coating, and can be widely applied to the fields of electromagnetic shielding and stealth.

Description

technical field [0001] The invention relates to a zirconium-titanium co-doped barium ferrite wave-absorbing powder material and a preparation method thereof, belonging to the technical field of wave-absorbing materials. Background technique [0002] In recent years, stealth technology has been widely used in military fields such as missiles, aircraft, and ships, and it has become the research focus of experts in the military field of various countries. With the rapid development of monitoring technology such as radar, new requirements are put forward 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 rapid development of modern high-tech, electromagnetic pollution has become an urgent problem to be solved in today's society. It can be seen that absorbing materials have important resea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26C04B35/622
Inventor 杜丕一刘初阳马宁韩高荣翁文剑
Owner ZHEJIANG UNIV
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