Preparation method of ferroferric oxide/silicon dioxide composite fiber wave-absorbing material

A technology of ferroferric oxide and composite fiber, which is applied in the direction of inorganic raw material artificial filaments, etc., can solve the problems of poor particle dispersion, high relative density, narrow absorption frequency band, etc., achieve low density, increase absorbing intensity, and broaden absorption bandwidth Effect

Inactive Publication Date: 2019-07-23
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the above-mentioned existing deficiencies such as high relative density, narrow absorption frequency band, poor particle dispersion, easy to corrode, poor high temperature resistance, etc., and provide a kind of ferroferric oxide / silicon dioxide composite fiber absorbing The preparation method of the material increases the absorbing frequency bandwidth of the absorbing material, improves the absorbing strength of the absorbing material, and effectively reduces the density of the absorbing material

Method used

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  • Preparation method of ferroferric oxide/silicon dioxide composite fiber wave-absorbing material
  • Preparation method of ferroferric oxide/silicon dioxide composite fiber wave-absorbing material
  • Preparation method of ferroferric oxide/silicon dioxide composite fiber wave-absorbing material

Examples

Experimental program
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Effect test

Embodiment 1

[0033] (1) Get 15g of citric acid, 12.12g of ferric nitrate hexahydrate and 4.17g of ferrous sulfate in a 100mL beaker, add 30mL of deionized water and 45mL of absolute ethanol, place it on a magnetic stirrer and stir for 1 hour, After the mixed solution is completely dissolved, the mixed solution is placed on a constant temperature heating magnetic stirrer and stirred and heated until the remaining volume is 1 / 3 of the original volume, thereby obtaining Fe 3 o 4 Sol.

[0034] (2) Put 200g of tetraethyl orthosilicate in the round bottom flask, then add 150g of ethanol and 30mL of deionized water respectively, after fully mixing, add an appropriate amount of hydrochloric acid to adjust the pH value of the solution to 5, and install a reflux tube After heating and stirring for 5 hours in a constant temperature magnetic stirrer at 50°C, a uniform SiO 2 Sol.

[0035] (3) the Fe made in (1) 3 o 4 The sol and the SiO2 sol made in (2) were uniformly mixed at a mass ratio of 1:1,...

Embodiment 2

[0041] (1) Get 15g of citric acid, 12.12g of ferric nitrate hexahydrate and 4.17g of ferrous sulfate in a 100mL beaker, add 30mL of deionized water and 45mL of absolute ethanol, place it on a magnetic stirrer and stir for 1 hour, After the mixed solution is completely dissolved, the mixed solution is placed on a constant temperature heating magnetic stirrer and stirred and heated until the remaining volume is 1 / 3 of the original volume, thereby obtaining Fe 3 o 4 Sol.

[0042] (2) Put 200g of tetraethyl orthosilicate in the round bottom flask, then add 150g of ethanol and 30mL of deionized water respectively, after fully mixing, add an appropriate amount of hydrochloric acid to adjust the pH value of the solution to 5, and install a reflux tube After heating and stirring for 5 hours in a constant temperature magnetic stirrer at 50°C, a uniform SiO 2 Sol.

[0043] (3) the Fe made in (1) 3 o 4 Sol and SiO made in (2) 2 The sol was evenly mixed at a mass ratio of 1:1, dilut...

Embodiment 3

[0049] (1) Get 15g of citric acid, 12.12g of ferric nitrate hexahydrate and 4.17g of ferrous sulfate in a 100mL beaker, add 30mL of deionized water and 45mL of absolute ethanol, place it on a magnetic stirrer and stir for 1 hour, After the mixed solution is completely dissolved, the mixed solution is placed on a constant temperature heating magnetic stirrer and stirred and heated until the remaining volume is 1 / 3 of the original volume, thereby obtaining Fe 3 o 4 Sol.

[0050] (2) Put 200g of tetraethyl orthosilicate in the round bottom flask, then add 150g of ethanol and 30mL of deionized water respectively, after fully mixing, add an appropriate amount of hydrochloric acid to adjust the pH value of the solution to 5, and install a reflux tube After heating and stirring for 5 hours in a constant temperature magnetic stirrer at 50°C, a uniform SiO 2 Sol.

[0051] (3) the Fe made in (1) 3 o 4 Sol and SiO made in (2) 2 The sol was uniformly mixed at a mass ratio of 2:1, di...

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Abstract

The invention provides a preparation method of a ferroferric oxide/silicon dioxide composite fiber wave-absorbing material, and relates to the field of microwave absorption. The composite fiber wave-absorbing material is prepared by a four-step method with citric acid, ferric nitrate, ferrous sulfate and ethyl orthosilicate as raw materials. Firstly, with the citric acid, the ferric nitrate and the ferrous sulfate as raw materials, Fe3O4 sol is prepared by a citric acid sol method; secondly, with the ethyl orthosilicate as a silicon source of SiO2 sol, the SiO2 sol is prepared by a Stober method; thirdly, uniformly mixing the Fe3O4 sol and the SiO2 sol, with acetone as a solvent, an appropriate amount of spinning aid is added, Fe3O4/SiO2 precursor to-be-spun sol is obtained, and Fe3O4/SiO2precursor composite fiber is prepared by an electrospinning method; finally, the Fe3O4/SiO2 precursor composite fiber is sintered in argon shielding gas to obtain the Fe3O4/SiO2 composite fiber wave-absorbing material. The preparation method is simple and controllable, the wave-absorbing range of the wave-absorbing material is effectively broadened, and the wave-absorbing performance is enhanced.

Description

technical field [0001] The invention relates to the field of microwave absorption, in particular to a preparation method of ferric oxide / silicon dioxide composite fiber microwave-absorbing material. Background technique [0002] With the rapid development of informatization, electromagnetic waves, as the carrier of transmission, are more and more widely used. However, while providing convenience for human beings, electromagnetic waves have also caused many negative effects. The large-scale application of electronic equipment in daily life produces a large amount of electromagnetic radiation, which will cause certain interference to communication signals, various experimental equipment and military weapon facilities, etc., and will also disturb the biological mechanism and endanger health. As a means to improve the survival, penetration and strike of weapon systems, electromagnetic stealth technology has become one of the research hotspots in the military field of various pow...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/08
CPCD01F9/08
Inventor 李宜彬李建军赫晓东尹维龙袁野杨明龙
Owner HARBIN INST OF TECH
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