Structured wave-absorbing material and preparation method thereof

A kind of absorbing material, structured technology, applied in electrical components, magnetic field/electric field shielding and other directions, can solve the problems of narrow absorbing frequency band, single-frequency absorption, heavy weight, etc., to achieve large void ratio, low material density, light weight Effect

Inactive Publication Date: 2012-06-27
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Judging from the current research status, each absorbing material has its unique absorbing performance, which is suitable for electromagnetic waves in different frequency bands, but the existing absorbing materials still have narrow absorbing frequency bands, single-frequency absorption, heavy mass, Disadvantages such as high density

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Add 0.5g of coniferous wood fiber, 0.5g of carboxymethyl fiber, 1g of ceramic fiber and 7g of bamboo charcoal particles into 1.5L of water, and stir at high speed for 10min in a fiber standard dissociator to form a uniformly mixed slurry. The diameter of the ceramic fiber is 3 μm, and the particle size of the bamboo charcoal is 10 μm. The uniformly mixed slurry is sliced ​​by a slicer, and a wet filter cake is formed after water filtration. The wet cake was pressed at a pressure of 5 bar, dried at 80°C for 1 hour, and then dried at 105°C for 24 hours. Put the dried composite material in N 2 Sintering at 800°C for 40 minutes under protection, with the gas flow rate controlled at 200ml / min, to obtain a structured wave-absorbing material with paper-like ceramic microfibers coated with bamboo charcoal particles.

Embodiment 2

[0029] Add 1g of coniferous wood fiber, 5g of polycrystalline pure Fe metal fiber, and 15g of bamboo charcoal particles into 1.5L of water, and stir at high speed for 10min in a fiber standard dissociator to form a uniformly mixed slurry. Among them, the polycrystalline metal fiber is 6 μm, and the particle size of bamboo charcoal is 10 μm. The uniformly mixed slurry is sliced ​​with a slicer, and a wet filter cake is formed after water filtration. The wet cake was pressed at a pressure of 5 bar, dried at 80°C for 1 hour, and then dried at 105°C for 24 hours. Put the dried composite material in N 2 Sintering at 1100° C. for 40 minutes under protection, with the gas flow rate controlled at 200 ml / min, to obtain a structured wave-absorbing material of paper-like polycrystalline metal microfibers coated with bamboo charcoal particles.

Embodiment 3

[0031] Add 1g of carboxymethyl fiber, 5g of ceramic fiber, 6g of bamboo charcoal particles and 3g of ferrite particles into 1.5L of water, and stir at high speed for 10min in a fiber standard dissociator to form a uniformly mixed slurry. The ceramic fiber diameter is 6 μm, the bamboo charcoal particle size is 10 μm, and the ferrite particle is 8 μm. The uniformly mixed slurry is sliced ​​with a slicer, and a wet filter cake is formed after water filtration. The wet cake was pressed at a pressure of 5 bar, dried at 80°C for 1 hour, and then dried at 105°C for 24 hours. Put the dried composite material in N 2 Sintering at 1000°C for 40 minutes under protection, with the gas flow rate controlled at 200ml / min, to obtain a structured wave-absorbing material with paper-like ceramic microfibers coated with bamboo charcoal particles and ferrite particles.

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Abstract

The invention discloses a structured wave-absorbing material and a preparation method thereof. The structured wave-absorbing material contains fiber with a micron-scale diameter and absorbent particles, wherein the fiber forms a three-dimensional network structure with adjustable and controllable porosity; and the absorbent particles are evenly covered in the three-dimensional network structure. The preparation method comprises the following steps of; mixing adhesives, fiber and the absorbent particles with water, and stirring at high speed to form uniform serous fluid; utilizing a wet papermaking process to make a precursor; and after drying the precursor, high-temperature sintering to form the structured wave-absorbing material with the absorbent particles covered by the paper-type micro fiber. The prepared structured wave-absorbing material has the characteristics of thinner thickness, high porosity, good flexibility, convenience in molding, strong absorbing capacity for electromagnetic wave; and the preparation process is simple and is low in cost. The structured wave-absorbing material can be applied to military and civil fields, the density and the weight of the wave-absorbing material are greatly reduced, the thermostable performance is good, the wave-absorbing efficiency can be improved, and the application prospect is broad.

Description

technical field [0001] The invention specifically relates to an electromagnetic wave absorbing material, in particular to a structured wave absorbing material and a preparation method thereof. Background technique [0002] With the rapid development of electronic technology, people are exposed to more and more electromagnetic radiation in their daily life. At the same time, in order to meet the needs of modern warfare, stealth materials are widely used in weapons. Therefore, the research on absorbing materials has important practical value. my country has started research on wave-absorbing materials and electromagnetic wave absorbers since the 1980s, and entered a relatively comprehensive research stage in the mid-to-late 1990s. Although domestic research on wave-absorbing materials has made good progress in some aspects and formed its own characteristics, most of its research focuses on the research of certain wave-absorbing materials, and there are relatively few studies o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05K9/00
Inventor 鄢瑛陈焕浩张会平
Owner SOUTH CHINA UNIV OF TECH
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