Barium ferrite composite material and preparation method and application thereof

A technology of composite materials and barium ferrite, applied in chemical instruments and methods, and other chemical processes, can solve problems such as poor dielectric properties and unsatisfactory wave-absorbing properties, and achieve good dielectric properties, easy industrial production, The effect of uniform composition

Active Publication Date: 2013-07-03
NINGBO SHANSHAN NEW MATERIAL TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the defects of unsatisfactory absorbing performance and poor dielectric properties of existing barium ferrite absorbing materials in the high frequency band, and to provide a barium ferrite composite material and its preparation method and application

Method used

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  • Barium ferrite composite material and preparation method and application thereof
  • Barium ferrite composite material and preparation method and application thereof
  • Barium ferrite composite material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Preparation steps of barium ferrite composite material:

[0042] (1) Preparation of amorphous nano-silica powder: Mix 1.86mL tetraethyl orthosilicate and 8.63mL absolute ethanol under stirring conditions, add 0.43mL diethanolamine, stir well, add 0.10mL deionized water dropwise, and age Gel was formed after curing for 5 hours, and vacuum-dried at 80°C for 2 hours to obtain amorphous nano-silica powder;

[0043] (2) 12.10g of Ba(NO 3 ) 2 and 219.12g of Fe(NO 3 ) 3 9H 2 O is respectively made into an aqueous solution of 0.05mol / L, and mixes uniformly to obtain a mixed solution (molar ratio Ba 2+ : Fe 3+ =1:11.7), add 122.23g citric acid (molar ratio citric acid: Ba 2+ =13.7) Mix evenly, gradually add ammonia water dropwise to adjust the pH value to 7, add 0.5 g of amorphous nano-silicon dioxide powder, sonicate for 10 minutes, stir in a water bath at 80 ° C, and evaporate the water to obtain a wet gel;

[0044] (3) The wet gel was vacuum-dried at 110°C, ignited in...

Embodiment 2

[0049] Preparation steps of barium ferrite composite material:

[0050] (1) Preparation of amorphous nano-silica powder: Mix 5.57mL tetraethyl orthosilicate and 25.90mL absolute ethanol under stirring conditions, add 1.30mL diethanolamine, stir well, add 0.30mL deionized water dropwise, and age Gel was formed after curing for 5 hours, and vacuum-dried at 80°C for 4 hours to obtain amorphous nano-silica powder;

[0051] (2) 11.86g of Ba(NO 3 ) 2 and 214.69g of Fe(NO 3 ) 3 9H 2 O is respectively made into an aqueous solution of 0.05mol / L, and mixes uniformly to obtain a mixed solution (molar ratio Ba 2+ : Fe 3+ =1:11.7), add 119.76g citric acid (molar ratio citric acid: Ba 2+ =13.7) Mix evenly, gradually add ammonia water dropwise to adjust the pH value to 7, add 1.5 g of amorphous nano-silicon dioxide powder, sonicate for 10 minutes, stir in a water bath at 80°C, and evaporate the water to obtain a wet gel;

[0052] (3) The wet gel was vacuum-dried at 110°C, ignited in ...

Embodiment 3

[0055] Preparation steps of barium ferrite composite material:

[0056] (1) Preparation of amorphous nano-silica powder: Mix 9.28mL tetraethyl orthosilicate and 43.17mL absolute ethanol under stirring conditions, add 2.16mL diethanolamine, stir well, add 0.50mL deionized water dropwise, and Gel was formed after curing for 5 hours, and vacuum-dried at 80°C for 6 hours to obtain amorphous nano-silica powder;

[0057] (2) 11.61g of Ba(NO 3 ) 2 and 210.27g of Fe(NO 3 ) 3 9H 2 O is respectively made into an aqueous solution of 0.05mol / L, and mixes uniformly to obtain a mixed solution (molar ratio Ba 2+ : Fe 3+ =1:11.7), add 117.29g citric acid (molar ratio citric acid: Ba 2+ =13.7) Mix well, gradually add ammonia water dropwise to adjust the pH value to 7, add 2.5g of amorphous nano-silicon dioxide powder, sonicate for 10 minutes, stir in a water bath at 80°C, and volatilize the water to obtain a wet gel;

[0058] (3) The wet gel was vacuum-dried at 110°C, ignited in air fo...

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Abstract

The invention discloses a preparation method of a barium ferrite composite material, which comprises the following steps: (1) well mixing an aqueous solution containing Ba2+ and an aqueous solution containing Fe3+ to obtain a mixed solution, mixing with citric acid, adjusting the pH value to 6.5-7.5, mixing with nanometer silica powder, dispersing uniformly, volatilizing the solvent to obtain wet gel, wherein the using amount of the nanometer silica powder is 0.5-10 wt% of the mass of the barium ferrite composite material; (2) drying the wet gel, performing self-propagating combustion, removing citric acid to obtain a precursor, calcining the precursor, and cooling to obtain the product. The preparation method of the invention is simple in process, high in precursor calcining activity, and low in calcining temperature; the prepared barium ferrite composite material is uniform in components, good in dielectric properties, good in wave absorption performance in high frequency range, and high in continuous bandwidth below -20 dB.

Description

technical field [0001] The invention relates to the field of microwave absorbing composite materials, in particular to a barium ferrite composite material and its preparation method and application. Background technique [0002] With the development of science and technology and electronic industry, electromagnetic interference caused by electromagnetic wave radiation has become a new source of pollution; in the face of modern high-tech warfare, wave-absorbing materials play a very critical role in military stealth technology, especially B2 stealth The emergence of bombers and F117 stealth fighters represents a great achievement of this type of material in the military field. Therefore, research on electromagnetic shielding and absorbing materials for absorbing electromagnetic waves has been highly valued and supported worldwide, and is of great significance in the civilian and military fields. [0003] According to the classification of absorbing loss mechanism, absorbing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K3/00
Inventor 牟国洪乔永民李念民李辉杜辉玉
Owner NINGBO SHANSHAN NEW MATERIAL TECH
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