Composite wave-absorbing material of zinc oxide-coated barium ferrite and preparation method thereof

A composite wave-absorbing material, barium ferrite technology, applied in the field of wave-absorbing materials, can solve problems such as unsuitable microwave absorbing materials, achieve excellent wave-absorbing performance, low production cost, and simple preparation process

Inactive Publication Date: 2012-06-20
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional barium ferrite (BaFe 12 o 19 ) has the characteristics of strong absorption and easy preparation, but due to its c-axis anisotropy, the resonant frequency is greater than 40GHz, which is not suitable for microwave absorbing materials

Method used

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  • Composite wave-absorbing material of zinc oxide-coated barium ferrite and preparation method thereof
  • Composite wave-absorbing material of zinc oxide-coated barium ferrite and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0015] Weigh 18g of citric acid, dissolve it in 100ml deionized water, and prepare a citric acid solution; weigh 22g of ferric nitrate and 1.3g of barium nitrate and dissolve it in the citric acid solution, and adjust the pH of the solution to 7 with ammonia water. Put the above solution in a drying oven and dry it at 80°C until it becomes jelly, heat the jelly to 200°C and burn it to react to obtain the product and grind it, heat treatment at 800°C for 2 hours, and obtain barium with an average particle size of 0.9 μm Ferrite powder. Weigh 3.00 g of zinc acetate, 0.5 g of polyvinylpyrrolidone and mix with 80 ml of diethylene glycol, then weigh 3.00 g of ground barium ferrite and add it to the above mixed solution for ultrasonication for 20 minutes. The above-mentioned mixture was introduced into a three-necked flask with an argon gas and a condenser, followed by argon gas for 30 minutes to remove the air in the system, and the system was slowly heated to 200° C. and kept for ...

Embodiment 2

[0017] Weigh 9.0 g of citric acid, dissolve it in 50 ml of distilled water, and prepare a citric acid solution; weigh 11.0 g of ferric nitrate, and dissolve 0.65 g of barium nitrate in the citric acid solution, and adjust the pH value to 9 with ammonia water. Put the above solution in a drying oven at 80°C and dry until it becomes jelly, heat the jelly to 200°C and burn it to react, collect the product, grind it thoroughly and heat it at 800°C for 2 hours to obtain barium with an average particle size of 0.9 μm Ferrite powder. Weigh 1.5 g of zinc acetate, 0.25 g of polyvinylpyrrolidone and 40 ml of diethylene glycol and mix to prepare a solution, then weigh 1.5 g of ground barium ferrite and add it to the above mixed solution for ultrasonication for 20 minutes. The above-mentioned mixture was introduced into a three-necked flask with an argon gas and a condenser, followed by argon gas for 30 minutes to remove the air in the system, and the system was slowly heated to 200° C. a...

Embodiment 3

[0019] Weigh 18g of citric acid, dissolve it in 100ml of distilled water, and prepare a citric acid solution; weigh 22g of ferric nitrate, and dissolve 1.3g of barium nitrate in the citric acid solution, and adjust the pH value to 7 with ammonia water. Put the above solution into a drying oven and dry it at 80°C until it becomes a jelly, heat the jelly to 200°C and burn it to react to obtain 20g of BaFe 12 o 19 The powder was ball milled for 5 hours and then heat-treated at 800°C for 2 hours to obtain barium ferrite powder with an average particle size of 0.6 μm. Weigh 1.5 g of zinc acetate, 0.5 g of polyvinylpyrrolidone and mix with 80 ml of diethylene glycol, then weigh 2.5 g of ground barium ferrite and add it to the above mixed solution for ultrasonication for 20 minutes. The above mixture was introduced into a three-necked flask with argon gas and a condenser, and argon gas was passed for 30 minutes to remove the air in the system, and the system was slowly heated to 200...

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Abstract

The invention discloses a composite wave-absorbing material of zinc oxide-coated barium ferrite and a preparation method thereof, and belongs to the technical field of wave-absorbing materials. The composite wave-absorbing material comprises zinc oxide-coated barium ferrite particles. The preparation method for the composite wave-absorbing material comprises the following steps: preparing ferric nitrate, barium nitrate and citric acid into a solution in molar ratio; regulating the pH value of the solution; performing drying by distillation until gel is generated; then heating for an auto-igniting process reaction; roasting to obtain the barium ferrite particles; dissolving zinc acetate into diethylene glycol, and adding a polyvinylpyrrolidone surface active agent to prepare a solution 1; adding a barium ferrite powder to the solution 1 in ferrum-zinc molar ratio; and reacting at certain temperature to obtain a zinc oxide-coated barium ferrite powder. The invention has the advantages that the preparation process is simple, and the production cost is low. The prepared composite wave-absorbing material of the zinc oxide-coated barium ferrite has excellent wave-absorbing performance, a stable structure and good dispersion property.

Description

technical field [0001] The invention relates to a zinc oxide-coated barium ferrite composite wave-absorbing material and a preparation method thereof, belonging to the technical field of wave-absorbing materials. Background technique [0002] With the development trend of the world's electronics industry, various electrical and electronic equipment are widely used in various sectors of the national economy. Most of the electronic and electrical equipment in operation are accompanied by the conversion of electromagnetic energy. High-density, wide-spectrum electromagnetic signals flood the entire human existence. space constitutes an extremely complex electromagnetic environment. Whether the electronic system with communication as the backbone can work normally in this electromagnetic environment is severely tested. In the communication system, integrated circuits have been widely used due to their modularization and convenience, and are developing towards miniaturization and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K3/00
Inventor 郑冀陈巍李松林宋鑫钊
Owner TIANJIN UNIV
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