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Electromagnetic wave-absorbing composite material with amorphous carbon shell and preparation method of electromagnetic wave-absorbing composite material

An amorphous carbon and electromagnetic wave-absorbing technology, which is applied in the field of equipment or components to shield electric or magnetic fields, can solve problems such as reducing multi-interface structures, excessive agglomeration of magnetic metal particles, and affecting material impedance matching

Pending Publication Date: 2021-09-14
CHINA SHIP DEV & DESIGN CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, direct carbonization of metal-organic framework materials with magnetic elements as the metal center often leads to excessive agglomeration of magnetic metal particles, which not only increases the dielectric constant sharply, affects the impedance matching of the material, but also reduces the multi-interface structure inside the material. , reducing the electromagnetic wave absorption efficiency

Method used

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  • Electromagnetic wave-absorbing composite material with amorphous carbon shell and preparation method of electromagnetic wave-absorbing composite material
  • Electromagnetic wave-absorbing composite material with amorphous carbon shell and preparation method of electromagnetic wave-absorbing composite material
  • Electromagnetic wave-absorbing composite material with amorphous carbon shell and preparation method of electromagnetic wave-absorbing composite material

Examples

Experimental program
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Effect test

Embodiment 1

[0030] An electromagnetic wave-absorbing composite material with an amorphous carbon shell, the preparation method of which is as follows:

[0031] 1) Weigh 2.44g cobalt nitrate hexahydrate, 2.5g zinc nitrate hexahydrate and 2.76g 2-methylimidazole, set aside;

[0032] 2) The cobalt nitrate hexahydrate, zinc nitrate hexahydrate and 2-methylimidazole weighed in step 1) were dissolved in 135mL methanol respectively to obtain cobalt nitrate methanol solution, zinc nitrate methanol solution, and 2-methylimidazole methanol solution;

[0033] 3) Slowly and uniformly drop the 2-methylimidazole methanol solution obtained in step 2) into the cobalt nitrate methanol solution, after the dropwise addition, stir and react at room temperature for 4 hours to obtain a methanol solution containing precipitate 1, and then add the zinc nitrate methanol The solution was added to the methanol solution containing precipitate 1, stirred at room temperature for 30 minutes to obtain a methanol solutio...

Embodiment 2

[0044] An electromagnetic wave-absorbing composite material with an amorphous carbon shell, the preparation method of which is as follows:

[0045] 1) Weigh 1.67g ferrous chloride tetrahydrate, 2.5g zinc nitrate hexahydrate and 2.76g 2-methylimidazole, set aside;

[0046] 2) Ferrous chloride tetrahydrate, zinc nitrate hexahydrate and 2-methylimidazole that step 1) weighed are dissolved in 135mL methanol respectively, obtain the methanol solution of ferrous chloride, zinc nitrate methanol solution, 2-methylimidazole Methanol solution of imidazole;

[0047] 3) Slowly and uniformly drop the 2-methylimidazole methanol solution obtained in step 2) into the methanol solution of ferrous chloride in the glove box in an air-isolated state, and stir at room temperature for 4 hours after the dropwise addition to obtain precipitate 1 Then add the zinc nitrate methanol solution into the methanol solution containing precipitate 1, stir and react at room temperature for 30 minutes to obtain...

Embodiment 3

[0050] An electromagnetic wave-absorbing composite material with an amorphous carbon shell, the preparation method of which is as follows:

[0051] 1) Weigh 2.44g nickel nitrate hexahydrate, 2.5g zinc nitrate hexahydrate and 2.76g 2-methylimidazole, set aside;

[0052] 2) Nickel nitrate hexahydrate, zinc nitrate hexahydrate and 2-methylimidazole that were weighed in step 1) were dissolved in 135mL methanol respectively to obtain methanol solution of nickel nitrate, methanol solution of zinc nitrate, and methanol solution of 2-methylimidazole ;

[0053] 3) Slowly and uniformly drop the 2-methylimidazole methanol solution obtained in step 2) into the methanol solution of nickel nitrate, after the drop is completed, perform a hydrothermal reaction at 120° C. for 4 hours to obtain a methanol solution containing precipitate 1, and then add the Add the zinc nitrate methanol solution into the methanol solution containing the precipitate 1, stir and react at room temperature for 30 m...

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Abstract

The invention relates to an electromagnetic wave-absorbing composite material with an amorphous carbon shell and a preparation method of the electromagnetic wave-absorbing composite material. The electromagnetic wave-absorbing composite material is of a core-shell structure, the interior of the electromagnetic wave-absorbing composite material is a carbon matrix uniformly wrapped with magnetic metal particles, and the outer layer of the electromagnetic wave-absorbing composite material is an amorphous carbon layer. The electromagnetic wave-absorbing composite material with the amorphous carbon shell has excellent dielectric loss, magnetic loss and impedance matching performance, low density (the density is lower than 0.5 g / cm < 3 >) is achieved while wide wave-absorbing bandwidth (greater than 4 GHz) and strong absorption (the maximum reflection loss is lower than-30 dB) are guaranteed, the requirements of the electromagnetic wave-absorbing material for thinness, lightness, width and strength are met, and the electromagnetic wave-absorbing composite material can be applied to the field of civil electromagnetic protection equipment and can also be applied to the field of invisible military equipment.

Description

technical field [0001] The invention belongs to the technical field of electric field or magnetic field shielding by equipment or components, and specifically relates to an electromagnetic wave-absorbing composite material with an amorphous carbon shell and a preparation method thereof. Background technique [0002] Electromagnetic waves are ubiquitous in nature and human production and life. While it brings great convenience to the production and life of human society and national defense security protection, it will also bring negative impacts to humans, such as affecting the normal operation of electronic equipment, or cause information leakage, etc. In order to remove or reduce the harm of electromagnetic wave radiation, the most direct way is to research and develop efficient electromagnetic wave absorbing materials. [0003] Traditional absorbing materials mainly use magnetic nanoparticles to absorb electromagnetic waves by using the magnetic loss mechanism. Although...

Claims

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Application Information

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IPC IPC(8): C09K3/00C01B32/05B22F9/30B22F1/00B82Y30/00B82Y40/00
CPCC09K3/00C01B32/05B22F9/30B82Y30/00B82Y40/00
Inventor 邬琪磊邓峰肖龙陈立杰
Owner CHINA SHIP DEV & DESIGN CENT
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