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Application of ferrite-carbon nano-tube composite material used as wave-absorbing material at low temperature

A technology of carbon nanotubes and absorbing materials, applied in electrical components, other chemical processes, magnetic field/electric field shielding, etc., can solve the problems of poor impedance matching, weak absorption performance, and narrow absorption frequency band of the absorbing layer.

Active Publication Date: 2014-01-29
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although carbon nanotubes have the advantages of excellent axial tensile strength, high elastic modulus, heat transfer, low density and high electrical conductivity, etc., due to the large dielectric constant of carbon nanotubes, the wave-absorbing layer suffers when used alone. Impedance matching is poor, and there are disadvantages such as narrow absorption frequency band and weak absorption performance

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  • Application of ferrite-carbon nano-tube composite material used as wave-absorbing material at low temperature

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The sample in this example is ferrite-carbon nanotube composite sample b, and the mass percentage of carbon nanotubes in ferrite is 0.5%, and its chemical expression is 0.5%CNTs-Ni 0.5 Zn 0.5 Fe 2 o 4 . The concrete preparation method of this ferrite-carbon nanotube composite material sample b is as follows:

[0047] (1) Weigh 0.6g of multi-walled carbon nanotubes and mix them with 200ml of concentrated nitric acid, reflux in an oil bath at 160°C for 7h to prepare modified carbon nanotubes, and then dissolve the modified carbon nanotubes in lignosulfonic acid In a supersaturated solution of sodium, ultrasonically crush for 50 minutes to obtain a uniformly dispersed carbon nanotube solution;

[0048] (2) Press Ni at room temperature 2+ : Zn 2+ : Fe 3+ The molar ratio is 0.5:0.5:2 and Ni(NO 3 ) 2 ·6H 2 O, Zn(NO 3 ) 2 ·6H 2 O and Fe(NO 3 ) 3 9H 2 O, add distilled water and the carbon nanotube solution configured in (1) to obtain a mixed solution, wherein CN...

Embodiment 2

[0059] The sample in this example is ferrite-carbon nanotube composite sample c, and the mass percentage of carbon nanotubes in ferrite is 1%, and its chemical expression is 1%CNTs-Ni 0.5 Zn 0.5 Fe 2 o 4 . The concrete preparation method of this ferrite-carbon nanotube composite material sample c is as follows:

[0060] (1) Weigh 0.6g of multi-walled carbon nanotubes and mix them with 200ml of concentrated nitric acid, reflux in an oil bath at 160°C for 7h to prepare modified carbon nanotubes, and then dissolve the modified carbon nanotubes in lignosulfonic acid In a supersaturated solution of sodium, ultrasonically crush for 50 minutes to obtain a uniformly dispersed carbon nanotube solution;

[0061] (2) Press Ni at room temperature 2+ : Zn 2+ : Fe 3+ The molar ratio is 0.5:0.5:2 and Ni(NO 3 ) 2 ·6H 2 O, Zn(NO 3 ) 2 ·6H 2 O and Fe(NO 3 ) 3 9H 2 O, add distilled water and the carbon nanotube solution configured in (1) to obtain a mixed solution, wherein CNTs: ...

Embodiment 3～6

[0072] Same as Example 1, Examples 3-6 are CNTs-MeFe 2 o 4 The preparation method of material, this method is basically identical with embodiment 1, difference is that chemical formula MeFe 2 o 4 The Me element, sintering temperature, and holding time are different, as shown in Table 1 below.

[0073] Table 1 CNTs-MeFe in Examples 2-6 2 o 4 The chemical expression and process conditions

[0074] Example

[0075] For the CNTs-MeFe prepared above 2 o 4 The conductivity measurement and analysis of the samples of the bulk material shows that the conductivity at low temperature below 260K can reach 0.0001-100S / m, and the conductivity at room temperature is 0.1-1000S / m. Therefore, the above-mentioned ferrite-carbon nanotube composite material can be used as a wave-absorbing material in ERL-based FEL light sources to meet the low temperature requirements of this type of accelerator for wave-absorbing materials for high-order mode suppressors; it can be used in radar ...

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Abstract

The invention discloses application of a ferrite-carbon nano-tube composite material. The inventor discovers that the ferrite-carbon nano-tube composite material can still keep a good conductivity at low temperature, and particularly, the conductivity of the ferrite-carbon nano-tube composite material can still reach 0.0001-1000S / m at a temperature of lower than 260K and even 70K when the carbon nano-tube in the composite material is 0.1-20% by mass of the ferrite in the composite material; and therefore, the ferrite-carbon nano-tube composite material can be used as a wave-absorbing material at low temperature of lower than 260K, such as being applied to a high-order mode suppressor in an ERL (Electronics Research Laboratory) light source, a radar shielding device for a deep sea submarine, an electromagnetism shielding device for deep space, an anti-electromagnetism interference device and the like, so that the problem of abnormal work of the wave-absorbing material at low temperature in practical application is solved.

Description

technical field [0001] The invention relates to the technical field of ferrite-carbon nanotube composite materials, in particular to the application of ferrite-carbon nanotube composite materials as wave-absorbing materials at low temperatures, such as absorbers for accelerator superconducting cavity high-order mode suppressors at low temperatures. Wave materials, radar shielding materials for deep-sea submarines, electromagnetic shielding materials for outer space, wave-absorbing materials for electronic devices, wave-absorbing materials for anti-electromagnetic interference devices, wave-absorbing materials for electromagnetic shielding devices, and wave-absorbing materials for stealth devices, etc. Background technique [0002] Absorbing materials with the ability to absorb electromagnetic waves are widely used in electronics, anti-electromagnetic interference, electromagnetic shielding, radar shielding and other devices, but currently devices using wave-absorbing material...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K3/00H05K9/00
Inventor 黄庆周小兵胡春峰
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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