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Nanometer composite wave absorbing powder having low density and porous structure, and its preparation method

A nano-composite, porous structure technology, applied in the field of absorbing materials

Inactive Publication Date: 2013-06-05
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The nano-stealth materials studied above that are compatible with radar and infrared wave absorption are mainly multi-layer structures, which have the following deficiencies: 1) The multi-layer structure is mainly composed of an infrared absorbing layer, a radar absorbing layer and an intermediate layer, but because There is a contradiction between infrared and radar absorption, so it is difficult for such materials to achieve better radar infrared stealth compatibility; 2) The thickness and quality of the film layer are greatly increased, and it is difficult to achieve the "thin and light" requirements
In addition, a single-layer material realizes the requirement of "thin and light" stealth materials, but the absorption frequency band is generally narrow, and the absorption strength is also weak. The single-layer stealth material in the above patents only realizes radar stealth or infrared stealth, which cannot meet the requirements of stealth materials" wide" requirements

Method used

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  • Nanometer composite wave absorbing powder having low density and porous structure, and its preparation method
  • Nanometer composite wave absorbing powder having low density and porous structure, and its preparation method
  • Nanometer composite wave absorbing powder having low density and porous structure, and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0048] Preparation of low-density nanoferrite A: Weigh 27.3g of citric acid, dissolve it in 200g of deionized water to form a citric acid aqueous solution, weigh 48.48g of iron nitrate nonahydrate, 2.9g of nickel nitrate hexahydrate, and dissolve them in the aqueous citric acid solution Stir to dissolve, mix the two solutions evenly under rapid stirring, then weigh 5.7g of sodium lauryl sulfate, add to the above solution and stir to dissolve, after dissolving, add ammonia water dropwise under rapid stirring conditions to adjust the pH value to 8, at 90°C Stir to evaporate the water until a gel with a moisture content of <10% is formed. Dry the gel in a drying oven at 120°C for 24 hours to obtain a dry gel, ignite it with alcohol, grind the dry gel with a mortar after self-propagating combustion, calcinate at 1100°C in a muffle furnace for 4 hours, and grind it finely to obtain a low-density gel. Nanoferrite A.

Embodiment 2

[0054] Preparation of tin-doped indium oxide precursor: Weigh 5.28g of indium chloride tetrahydrate and 0.7g of tin chloride pentahydrate and dissolve them in deionized aqueous solution and mix them evenly. Add ammonia water dropwise under rapid stirring conditions to adjust the pH value to 8.5. The temperature was kept at 50° C. for two hours to obtain a tin-doped indium oxide precursor. Finally, the mass of the precursor was weighed, and the theoretical value of the obtained tin-doped indium oxide was calculated, and the mass ratio of the two was obtained as the theoretical value of tin-doped indium oxide:precursor=1:2.1. Take part of the precursor and wash it with ethanol, filter to obtain the precipitate, dry it in a drying oven at 120°C for 24 hours, and grind it with a mortar to obtain a xerogel, calcinate it at 600°C for 2 hours, cool it, and grind it finely to obtain a tin-doped indium oxide precursor.

Embodiment 3

[0056] Weigh 4.2 g of the tin-doped indium oxide precursor obtained in Example 2, add 2 g of the low-density nano-ferrite A in Example 1, stir evenly at high speed, wash with ethanol, filter to obtain the precipitate, and dry in a drying oven at 120°C for 24 hours , the dried product was ground with a mortar, calcined at 600°C for 2h, cooled, and ground to obtain a nanocomposite powder A with compatible absorption of low-density radar waves and infrared waves.

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Abstract

The invention discloses a nanometer composite wave absorbing powder having a low density and a porous structure, and its preparation method. The preparation method of the composite wave absorbing powder comprises the following steps: 1, preparing porous ferrite through adopting a citrate sol-gel method, adding an organic additive in the porous ferrite preparation process, burning at a high temperature for combusting the organic additive to form ferrite having a porous structure; and 2, preparing an oxide doped precursor through adopting a sol-gel method, adding the ferrite having a porous structure, and burning at a high temperature to obtain the composite wave absorbing powder. The method reduces the density of the composite wave absorbing powder, the powder having a porous structure has a certain heat insulation effect, and the composite wave absorbing powder prepared through the method has the advantages of compatible absorption of radar waves and infrared waves, low density, wide absorption wave frequency band, good wave absorption performance, and simple preparation process, and overcomes the large density disadvantage of wave absorption materials prepared through using traditional ferrite.

Description

technical field [0001] The invention relates to a nanocomposite wave-absorbing powder with the function of absorbing radar waves and infrared waves and a preparation method thereof, belonging to the field of wave-absorbing materials. Background technique [0002] With the development of modern science and technology, wave-absorbing materials have been applied in the stealth technology of various aircraft, ships, bridges, tanks and other facilities. Stealth technology is an effective means to improve the survival and penetration of weapon systems, especially in-depth strike capabilities. , has become the most important and effective penetration tactical and technical means in the three-dimensional modern warfare integrating land, sea, air and sky, and has been highly valued by all military powers in the world. In addition, with the rapid development of mobile communications, radar systems, local area networks and other fields, electromagnetic radiation pollution has become th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K3/00
Inventor 刘娅莉贾玉玉邓剑如钟辛吴小松
Owner HUNAN UNIV
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