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Metal-semiconductor electromagnetic wave absorption type nano composite material and preparation method thereof

A nanocomposite material and composite material technology, applied in the field of electromagnetic wave absorbing materials, can solve the problems that nanocomposite materials do not have multiple resonance absorption, etc., and achieve the effects of large-scale industrial production, low equipment cost and simple process

Inactive Publication Date: 2012-04-18
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a metal-semiconductor type electromagnetic wave absorbing nanocomposite material with multiple resonance properties and its mechanochemical improvement synthesis method to solve the problem that the nanocomposite material synthesized in the prior art does not have the performance of multiple resonance absorption in the whole band And other issues

Method used

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  • Metal-semiconductor electromagnetic wave absorption type nano composite material and preparation method thereof
  • Metal-semiconductor electromagnetic wave absorption type nano composite material and preparation method thereof
  • Metal-semiconductor electromagnetic wave absorption type nano composite material and preparation method thereof

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Embodiment 1

[0029] First, in the glove box, 65wt% of analytically pure iron oxide, 35wt% of analytically pure titanium powder, and about 10% of the total weight of the former two TiO 2 Put the powder and stainless steel balls into a ball mill jar, take it out from the glove box after sealing, and mill it in a high-energy ball mill for 30 hours. The mass ratio of stainless steel balls to raw materials in the ball mill is 15-20, and carry out mechanochemical reaction; Place in a vacuum annealing furnace and anneal at 950°C for 30 minutes. The atmosphere in the annealing furnace and the ball milling tank is argon, which protects the iron nanoparticles from being oxidized by air at high temperature.

[0030] After the sample was cooled to room temperature (morphology as figure 1 Shown), the electromagnetic performance of the sample is tested with an Agilent 8722ES network analyzer, and the results are as follows figure 2 shown. Among them, TiO 2 The function of the powder is to lower the ...

Embodiment 2

[0033] In the glove box, 63wt% of analytically pure iron oxide, 37wt% of analytically pure titanium powder, and about 10% of the total weight of the former two TiO 2 Put the powder and stainless steel balls into a ball mill jar, take it out from the glove box after sealing, and mill it in a high-energy ball mill for 40 hours. The mass ratio of stainless steel balls to raw materials in the ball mill is 15-20, and carry out mechanochemical reaction; Place in a vacuum annealing furnace and anneal at 350°C for 50 minutes. The atmosphere in the annealing furnace and the ball milling tank is argon, which protects the iron nanoparticles from being oxidized by air at high temperature.

[0034] After the sample was cooled to room temperature (morphology as image 3 Shown), the electromagnetic performance of the sample is tested with an Agilent 8722ES network analyzer, and the results are as follows Figure 4 shown. This embodiment obtains the metal-semiconductor type electromagnetic ...

Embodiment 3

[0037] First, in the glove box, 64wt% of analytically pure iron oxide, 36wt% of analytically pure titanium powder, and about 12% of the total weight of the former two TiO 2Put the powder and stainless steel balls into a ball mill jar, take it out from the glove box after sealing, and mill it in a high-energy ball mill for 35 hours. The mass ratio of stainless steel balls to raw materials in the ball mill is 15-20, and carry out mechanochemical reaction; Place in a vacuum annealing furnace and anneal at 800°C for 40 minutes. The atmosphere in the annealing furnace and the ball milling tank is argon, which protects the iron nanoparticles from being oxidized by air at high temperature.

[0038] This embodiment obtains the metal-semiconductor type electromagnetic wave absorbing nanocomposite material, and its structure and performance are as follows: The gained composite material is Fe / TiO 2 , the two phases are closely connected, in which the average grain size of Fe is about 35-...

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Abstract

The invention relates to the field of an electromagnetic wave absorption material, in particular to a metal-semiconductor electromagnetic wave absorption type nano composite material with a plurality of resonance properties and a preparation method thereof based on mechanical and chemical modification and synthesis. The material has excellent full-radar-band absorption properties. The composite material is Fe / TiO2, two ingredients are closely linked, and the grain size of Fe is 20-60nm, the grain size of TiO2 is 25-65nm. The preparation method comprises: (1) iron oxide, titanium powder and TiO2 powder of 5-15 percent of the total mass of the former two materials are milled for 30-40 hours in a high-performance mill for mechanical and chemical reaction, wherein the mass proportion of ironoxide and titanium powder is 1.70-1.90; and (2) the obtained powder is annealed in an annealing furnace, the annealing temperature is 350-960 DEG C, and the annealing time is 10-90 minutes. Since strong absorption can be realized in the frequency band of 2-18GHz, the composite material can be used as a surface coating of a stealth aircraft. Meanwhile, the problems of electromagnetic wave conflicts of the X-band (10-12.4GHz) and Ku-band (12.4-18GHz) in mobile phones, intelligent transmission, local area networks and radar systems can be solved.

Description

Technical field: [0001] The invention relates to the field of electromagnetic wave absorbing materials, in particular to a metal-semiconductor type electromagnetic wave absorbing nanocomposite material with multiple resonance properties and a mechanochemically improved synthesis and preparation method thereof. The material has excellent full radar band absorbing properties. Background technique: [0002] Electromagnetic wave absorbing material is one of the important materials of weapons and equipment. Electromagnetic wave absorbing material can greatly reduce the radar cross section of aircraft, thereby improving its survival defense capability and overall combat performance. Since the 1960s, microwave-absorbing materials have received more attention and become a hot spot in the research and development of military forces in various countries. Military equipment using wave-absorbing materials shined brilliantly in various local wars during and after the Cold War. Not only t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F9/04B22F9/20H05K9/00H01F1/12
Inventor 张强张志东
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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