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Flaky ferrite wave-absorbing material, flaky ferrite/carbon composite wave-absorbing material as well as preparation method and application of flaky ferrite wave-absorbing material and flaky ferrite/carbon composite wave-absorbing material

A wave-absorbing material and ferrite technology, applied in the direction of analyzing, analyzing materials, chemical instruments and methods through chemical reactions of materials, can solve the problem of narrow application frequency band, difficult impedance matching, high density of ferrite, etc. problems, achieve high anisotropy and magnetic field, obvious magnetic performance advantages, and high natural resonance frequency

Pending Publication Date: 2022-07-01
LUOYANG INST OF CUTTING EDGE TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the density of traditional ferrite is high, and it is difficult to meet the principle that the relative permittivity and relative permeability are as close as possible, which makes the impedance not easy to match. Therefore, it is difficult for this type of ferrite to satisfy strong absorption, wide frequency band and light weight at the same time. And the requirements of high-performance absorbing materials such as thin thickness
[0003] Although the traditional improvement of ferrite improves the absorbing performance, most of the improved ferrite can only be applied in the high frequency band, and the application frequency band is narrow

Method used

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  • Flaky ferrite wave-absorbing material, flaky ferrite/carbon composite wave-absorbing material as well as preparation method and application of flaky ferrite wave-absorbing material and flaky ferrite/carbon composite wave-absorbing material
  • Flaky ferrite wave-absorbing material, flaky ferrite/carbon composite wave-absorbing material as well as preparation method and application of flaky ferrite wave-absorbing material and flaky ferrite/carbon composite wave-absorbing material

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Experimental program
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preparation example Construction

[0035] The present invention provides a method for preparing a sheet-like ferrite wave absorbing material, which includes the following steps S11 to S13.

[0036] S11: configure the first mixed solution, the first mixed solution contains Fe 3+ material, containing Ba 2+ material and first solvent.

[0037] The above-mentioned first mixed solution includes the following raw materials in parts by weight: 80-150 parts containing Fe 3+ material, 5 to 20 parts containing Ba 2+ material and 400-1500 parts of the first solvent, the first solvent is a polar solvent.

[0038] Further, the above-mentioned contain Fe 3+ The material is selected from FeCl 3 and Fe 2 (SO 4 ) 3 At least one of the above containing Ba 2+ The material is selected from BaCl 2 and BaSO 4 At least one of the above polar solvents is selected from at least one of ethanol and water.

[0039] In a specific example, in the above step S11, the first mixed solution is prepared, and after ultrasonic treatmen...

Embodiment 1

[0092] The present embodiment provides a preparation method of a sheet-like ferrite wave absorbing material, comprising the following steps:

[0093] will contain 100 parts FeCl 3 and 15 parts BaCl 2 Dissolved in 800 parts of deionized aqueous solution, ultrasonically treated for 10min to make it evenly mixed to form a reaction solution, stirred evenly for 20min at 800r / min at 60°C, and the pH adjusting solution of 10% sodium hydroxide was slowly and uniformly added. Add it to the reaction solution, when the pH is controlled at 8.5, stop the addition of the adjustment solution, and then continue to stir in an oil bath at 120 °C for 3 hours at a speed of 2000 r / min to make it fully react. One reactant, pour out the supernatant, add deionized water to continue cleaning, repeat the above operation 5 times to complete the cleaning of the powder. The washed precipitate was placed in a blast oven at 60°C for drying for 12h.

Embodiment 2

[0095] The present embodiment provides a preparation method of a sheet-like ferrite / carbon composite wave absorbing material, comprising the following steps:

[0096] will contain 100 parts FeCl 3 and 15 parts BaCl 2 Dissolved in 800 parts of deionized aqueous solution, ultrasonically treated for 10min to make it evenly mixed to form a reaction solution, stirred evenly for 20min at a speed of 800r / min at 60°C, and 10% sodium hydroxide pH adjusting solution was slowly and uniformly Add to the reaction solution, when the pH is controlled at 8.5, stop the addition of the adjustment solution, and then continue to stir in a 120 ℃ oil bath at a speed of 2000 r / min for 3 hours to make it fully react. After the reaction, use a magnetic substance to adsorb the beaker. For the first reactant, pour out the supernatant and add deionized water to continue cleaning. Repeat the above operation 5 times to complete the cleaning of the powder. After obtaining the first precipitate, put it into...

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Abstract

The invention discloses a flaky ferrite wave-absorbing material, a flaky ferrite / carbon composite wave-absorbing material as well as a preparation method and application of the flaky ferrite / carbon composite wave-absorbing material. The flaky ferrite wave-absorbing material is prepared by the following steps: preparing a first mixed solution of a material containing Fe < 3 + >, a material containing Ba < 2 + > and a first solvent; adjusting the pH value of the first mixed solution to 8-9, heating to 80-150 DEG C, keeping for 2-5 hours, fully reacting, and then cleaning, filtering and drying to obtain the composite material. The prepared flaky ferrite wave-absorbing material has higher anisotropy and magnetic effect field due to the unique hexagonal crystal structure, and also has higher natural resonance frequency, the dielectric constant is obviously reduced and the impedance matching is improved due to the double dielectric properties of the ferrite; the double wave-absorbing capability of magnetic loss and dielectric loss of the ferrite is reserved, the propagation path of electromagnetic waves is increased, and the ferrite has an obvious magnetic property advantage at low frequency.

Description

technical field [0001] The invention relates to the field of chemical materials, in particular to a sheet-shaped ferrite wave-absorbing material, a sheet-shaped ferrite / carbon composite wave-absorbing material, and a preparation method and application thereof. Background technique [0002] With the widespread popularity of electronic equipment, electromagnetic pollution and electromagnetic interference are becoming more and more common, and the impact of electromagnetic wave radiation on the environment is increasing. Electromagnetic radiation causes direct and indirect damage to the human body through thermal effects, non-thermal effects, and cumulative effects. The absorbing material can absorb or greatly weaken the electromagnetic wave energy received by its surface, thereby reducing the interference of electromagnetic waves. Ferrite is one of the most researched, lowest cost and most widely used traditional absorbing materials. Ferrite has the characteristics of wide so...

Claims

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Application Information

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IPC IPC(8): C09K3/00G01N9/00G01N21/78G01R27/26
CPCC09K3/00G01R27/2617G01R27/2694G01N9/00G01N21/78
Inventor 刘若鹏赵治亚刘志礼黄赤
Owner LUOYANG INST OF CUTTING EDGE TECH