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A kind of low microwave reflection lead-doped barium ferrite and preparation method thereof

A technology of barium ferrite and microwave reflection, which is applied in the field of microwave-absorbing materials, can solve problems such as little influence of microwave loss, and achieve the effects of low microwave reflection coefficient, good crystal phase, and high coercive force

Inactive Publication Date: 2017-05-10
SHENYANG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention provides a lead-doped barium ferrite with low microwave reflection and its preparation method to solve the problem that the metal-doped barium ferrite has little effect on microwave loss in the prior art

Method used

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  • A kind of low microwave reflection lead-doped barium ferrite and preparation method thereof
  • A kind of low microwave reflection lead-doped barium ferrite and preparation method thereof
  • A kind of low microwave reflection lead-doped barium ferrite and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0029] 1) Prepare the sol, mix barium nitrate, lead nitrate, and ferric nitrate according to the molar ratio of 0.9:0.1:11, add distilled water and stir until fully dissolved, use citric acid solution as the compounding agent, according to Ba 2+ +Pb 2+ +Fe 3+ : Citric acid=1:1.2 molar ratio, add citric acid solution in the middle of the mixture, mix evenly to form a sol.

[0030] 2) To prepare a gel, adjust the sol prepared in step 1) to pH=6 with ammonia water, stir in a water bath at 60°C to form a gel, and dry it in a blower oven at 120°C to form a xerogel.

[0031]3) Carbonization and calcination, put the xerogel prepared in step 2) into a muffle furnace, carbonize at 200°C for 1h, take it out and grind it, and calcinate at 1100°C for 6h at a heating rate of 15°C / min to obtain lead-doped Barium ferrite powder.

[0032] 4) Grinding, grinding the lead-doped barium ferrite powder prepared in step 3) in a mortar for 30 minutes, the obtained black powder is low microwave ref...

Embodiment 2

[0035] The difference from Example 1 is that barium nitrate; lead nitrate=0.5:0.5 (molar ratio), the low microwave reflection lead-doped barium ferrite molecular formula that makes is Ba 0.5 Pb 0.5 Fe 12 o 19 .

[0036] Will Ba 0.5 Pb 0.5 Fe 12 o 19 Perform XRD to obtain its spectrum, such as image 3 As shown, the obtained spectrum is consistent with that of BaFe 12 o 19 The standard spectrograms are completely consistent, indicating that the resulting product is a single-phase M-ferrite; the Ba 0.5 Pb 0.5 Fe 12 o 19 Electron microscope scanning test was carried out, and the results were as follows: Figure 4 As shown, the sample is a plane hexagon with a maximum diameter of about 2.5 μm, and the grain size distribution is uneven.

Embodiment 3

[0038] The difference from Example 1 is that no barium nitrate is added, and lead nitrate and ferric nitrate are mixed according to the molar ratio of 1:11, and the molecular formula of the obtained lead ferrite wave-absorbing material is PbFe 12 o 19 .

[0039] PbFe 12 o 19 Perform XRD to obtain its spectrum, such as Figure 5 As shown, the obtained spectrum is consistent with that of BaFe 12 o 19 The standard spectrograms are completely consistent, indicating that the obtained product is a single-phase M-ferrite. PbFe 12 o 19 Scanning electron microscopy was carried out, and the results were as follows Figure 6 As shown, the sample is a plane hexagon with a diameter of about 2 μm and a thickness of about 0.2 μm, and the grain size distribution is relatively uniform.

[0040] Such as Figure 7 Shown, is the substitution amount x to Ba 1-x Pb x Fe 12 o 19 The influence of magnetic properties of magnetic powder, the abscissa is Pb 2+ The doping ratio of , the or...

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Abstract

The invention belongs to the technical field of wave absorbing materials, and in particular relates to a low microwave reflection lead-doped barium ferrite and a preparation method thereof. First, mix barium nitrate, lead nitrate and ferric nitrate according to the molar ratio of 0.0-0.9:0.1-1.0:11, and the molar ratio of barium nitrate and lead nitrate is equal to 1, add distilled water, stir until fully dissolved, and add citric acid solution. In order to generate a sol for the compounding agent, adjust the pH to 6 with ammonia water, stir in a water bath at 60 °C to form a gel, put it in a 120 °C blast box to dry into a dry gel, put it in a muffle furnace, carbonize it at 200 °C for 1 hour, take it out and grind it Then, the lead-doped barium ferrite powder was obtained by calcining at 1100°C for 6 hours at a heating rate of 15°C / min, and further grinding to obtain the target product. The invention effectively adjusts the coercive force of barium ferrite by adjusting the doping amount of Pb2+, reduces microwave reflection, and the obtained product has high purity, good crystal phase, simple process, and can realize industrialized production.

Description

technical field [0001] The invention belongs to the technical field of wave-absorbing materials, and in particular relates to a lead-doped barium ferrite with low microwave reflection and a preparation method thereof. Background technique [0002] Barium ferrite is a hard ferrite with a hexagonal magnetoplumbite structure and belongs to P6 3 / mmc space group. It has high saturation magnetization, high coercive force and chemical stability. Due to the high magnetocrystalline anisotropy due to the planar hexagonal structure, it is recognized as one of the most promising absorbing materials. Reflection of microwave electromagnetic radiation at the surface of barium ferrite and its doped barium ferrite is weakened because of magnetic and dielectric absorption. Changing the electromagnetic properties can change the microwave absorption capacity of barium ferrite. [0003] Ferrites with different shapes have different microwave absorption capabilities. Therefore, the morpholog...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/26C04B35/622
Inventor 刘颖刘跃台睿李晓杰李阳
Owner SHENYANG NORMAL UNIV
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