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Nano iron oxide /graphite composite electromagnetic absorption material and preparation method thereof

A nano-iron oxide, absorbing material technology, applied in the parts, shielding, instruments and other directions of the instrument, can solve the problems of small temperature range, low frequency absorption performance, absorption frequency bandwidth, etc., to expand the low frequency absorption Frequency range, inhibition of crystal growth and agglomeration, effects of adjustable electromagnetic parameters

Inactive Publication Date: 2012-04-25
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polycrystalline iron fiber and magnetic metal powder have a wide absorption frequency band and good wave absorption performance, but their corrosion resistance is poor
Conductive polymers are uniform in texture, easy to process and shape, low in density, and adjustable in electromagnetic parameters. The disadvantage is that the operating temperature range is small.
Ferrite has high absorption efficiency, thin coating, and wide frequency band. It is the most commonly used microwave absorber. The disadvantages are high density and poor temperature stability, which will increase the weight of the components and even affect the performance of the components. It is impossible within the frequency used. good match
All of the above are simple ferrite absorbing materials, which can adapt to a narrow frequency range. It is impossible to achieve good matching within the frequency of use, and the density is too large, the high-frequency absorbing performance is reduced, and the preparation method is complicated, which limits its use. Application range

Method used

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  • Nano iron oxide /graphite composite electromagnetic absorption material and preparation method thereof
  • Nano iron oxide /graphite composite electromagnetic absorption material and preparation method thereof
  • Nano iron oxide /graphite composite electromagnetic absorption material and preparation method thereof

Examples

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Effect test

example 1

[0022] Add 100g of ferric citrate into a beaker, dissolve it completely in 1000ml of water, adjust the pH value to between 6 and 8, add it to the prepared 0.1g / ml graphite oxide aqueous solution, stir for 30min, and put it in a drying oven at 80°C After drying for 48 hours, the obtained solid was ground to 200 mesh, and then put into a muffle furnace for heat treatment to obtain a nano-iron oxide / graphite composite material. The mass ratio of iron salt to graphite oxide is: 1:1-3:1. The heat treatment temperature is 800°C, and the heat treatment is 3 to 14 hours. The main component of iron oxide is Fe 3 o 4 , Fe 2 o 3 , Fe.

example 2

[0024] Add 50g of ferric nitrate into a beaker, dissolve it completely in 100ml of water, add it into the prepared 0.1g / ml graphite oxide aqueous solution, stir for 30min, put it in a drying oven at 80°C for 48h, and grind the obtained solid to 200 mesh , and then heat-treated in a muffle furnace to obtain a nano-iron oxide / graphite composite material. The mass ratio of iron salt to graphite oxide is 3:1. The heat treatment temperature is 500°C, and the heat treatment is 14h. The main component of iron oxide is Fe 3 o 4 , Fe 2 o 3 .

example 3

[0026] Add 100g of ferric chloride into the beaker, dissolve it completely in 1000ml of water, adjust the pH value to between 6 and 8 with hydrochloric acid, add it to the prepared 0.1g / ml graphite oxide aqueous solution, stir for 30min, and put it in 80℃ Dry it in a drying oven for 48 hours, grind the obtained solid to 200 mesh, and put it into a muffle furnace for heat treatment to obtain a nano-iron oxide / graphite composite material. The mass ratio of iron salt to graphite oxide is: 1:1-3:1. The heat treatment temperature is 700°C, and the heat treatment is 3 to 14 hours. The main component of iron oxide is Fe 2 o 3 .

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Abstract

The invention relates to a nano iron oxide / graphite composite electromagnetic absorption material and a preparation method thereof. The material is composite powder formed nano iron oxides and graphite oxides, and the nano iron oxides are uniformly distributed among the layers of the graphite oxides as well as the surface of the graphite oxides of the composite powder. The material of the invention enlarges the frequency range of wave absorption and meets practical use requirements through the composition of the nano iron oxides with strong dielectric loss and magnetic loss and the graphite oxides with high resistance loss.

Description

technical field [0001] The invention relates to the field of electromagnetic wave absorbing materials, in particular to a nanometer iron oxide / graphite composite electromagnetic wave absorbing material and a preparation method thereof. Background technique [0002] The rapid development of electronic technology makes various weapon systems in the future battlefield face severe threats. In modern warfare, the acquisition and anti-acquisition of information has become the focus of warfare. Discovering and attacking the enemy before the enemy is an important guarantee for defeating the enemy. As one of the three major contemporary military technological innovations, stealth technology has become the most important and effective penetration tactical technical measure in the five-in-one three-dimensional modern warfare of sea, land, air, space, and electromagnetics. It is to improve the survival of weapon systems, An indispensable means of penetration and deep strike capabilitie...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G12B17/02
Inventor 刘洪波周娣
Owner HUNAN UNIV
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