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Co/C composite nanofiber microwave absorbent, and preparation method and application thereof

A technology of composite nanofibers and microwave absorbers, which is applied in the fields of fiber chemical characteristics, chemical instruments and methods, and rayon manufacturing, can solve the problems of poor oxidation resistance and corrosion resistance, and achieve improved microwave absorption performance, low cost, and The effect of wide band

Active Publication Date: 2013-12-04
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the plated or deposited magnetic metal or alloy coating is located on the surface of carbon nanofibers, its oxidation resistance and corrosion resistance are poor, which limits the use of such magnetic carbon nanofiber composites in some complex environments to a certain extent. normal use

Method used

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  • Co/C composite nanofiber microwave absorbent, and preparation method and application thereof
  • Co/C composite nanofiber microwave absorbent, and preparation method and application thereof
  • Co/C composite nanofiber microwave absorbent, and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0026] The preparation method of Co / C composite nanofiber microwave absorber of the present invention mainly comprises the preparation of spinning solution, the electrospinning of precursor fiber and preoxidation and carbonization treatment to the precursor fiber after electrospinning, the preparation method The specific steps are:

[0027] Step 1: Add 0.9 g of polyacrylonitrile (PAN, average molecular weight 150,000) into an Erlenmeyer flask filled with 8.3 g of dimethylformamide (DMF), heat in a water bath at 50°C and stir magnetically for 3 hours until PAN is completely dissolved , and then add 0.8g of cobalt acetylacetonate, continue magnetic stirring at room temperature for 15h to obtain a uniform, transparent and stable spinning solution, the mass fraction (mass percentage) of PAN in the spinning solution is 9%, acetyl The mass fraction (mass percentage) of cobalt acetone is 8%, and the rest is solvent DMF in the solution;

[0028] Step 2, move the prepared spinning sol...

Embodiment 2

[0032] The basic process of the preparation method of the Co / C composite nanofiber microwave absorber in Example 2 is the same as in Example 1, except that the carbonization temperature in Example 2 is 800 °C, and the obtained Co / C composite nanofiber The average diameter of the fiber microwave absorber is about 300nm.

[0033]Using silica gel as a matrix, the Co / C composite nanofiber microwave absorber prepared in Example 2 is used as an absorber to make a wave-absorbing coating. When the content (mass percentage) of the absorbing agent in the wave-absorbing coating is 3wt% , when the coating thickness is 2.0mm, the minimum reflection loss of the absorbing coating is –45dB, the effective absorption bandwidth is 8.9GHz, and the frequency range is 8.2~18GHz.

Embodiment 3

[0035] The basic process of the preparation method steps of the Co / C composite nanofiber microwave absorber of embodiment 3 is the same as embodiment 1, and the difference from embodiment 1 is: the PAN content of the spinning solution in embodiment 3 is 7wt%, the cobalt acetylacetonate content The carbonization temperature is 1000℃, and the average diameter of the obtained Co / C composite nanofiber microwave absorber is about 450nm.

[0036] Using silica gel as a matrix, the Co / C composite nanofiber microwave absorber prepared in Example 3 is used as an absorber to make a wave-absorbing coating. When the content of the absorbing agent in the wave-absorbing coating is 7wt%, the coating thickness is 1.9 mm, the minimum reflection loss of the absorbing coating is –46dB, the effective absorption bandwidth is 6.7GHz, and the frequency range is 8.8~15.5GHz.

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Abstract

The invention discloses a Co / C composite nanofiber microwave absorbent. The microwave absorbent comprises magnetic Co nanoparticles and carbon nanofiber, wherein the Co nanoparticles are uniformly distributed in the carbon nanofiber or on the surface of the carbon nanofiber, and are wrapped by a graphitized carbon layer. The invention also discloses a preparation method for the Co / C composite nanofiber microwave absorbent. The method combines electrostatic spinning with later-stage heat treatment to prepare the Co / C composite nanofiber microwave absorbent by a one-step method, the synthesis process is simple and the average diameter of the obtained fiber is 200 to 500 nm. The Co / C composite nanofiber microwave absorbent prepared by the method has strong antioxidant and corrosion-resistant abilities, is an electromagnetic wave absorbing material with excellent comprehensive performance, has the advantages of light weight, wideband, strong absorption capacity and convenient and adjustable electromagnetic parameters, and has an excellent application prospect in the technical fields of electromagnetic stealth, electromagnetic shielding, resistance to electromagnetism radiation interference and the like.

Description

technical field [0001] The invention relates to a magnetic carbon-based nano-composite absorbing material integrating broadband, light weight and strong absorption, in particular to a Co / C composite nanofiber microwave absorber, and also to the preparation of the composite nanofiber microwave absorber The method and application thereof belong to the field of electromagnetic wave absorbing materials. Background technique [0002] Electromagnetic wave absorbing materials are widely used in military and civil affairs, and have become a research hotspot in the fields of military equipment electromagnetic stealth, electromagnetic shielding and anti-electromagnetic radiation interference. The absorption of electromagnetic waves by absorbing materials mainly depends on the electromagnetic wave absorber filled therein. With the development of nanotechnology, the low-dimensional nanoscale of traditional absorbers such as ferrite and magnetic metal materials has greatly improved and ...

Claims

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Application Information

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IPC IPC(8): D01F9/22D01F1/10D01F11/12C09D1/00C09D7/12C09K3/00
Inventor 向军张雄辉李佳乐叶芹徐加焕
Owner JIANGSU UNIV OF SCI & TECH
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