Ni/C composite nanofiber microwave absorbent, preparation method and application of absorbent

A technology of composite nanofibers and microwave absorbers, which is applied in the fields of fiber chemical characteristics, chemical instruments and methods, rayon manufacturing, etc., can solve the problems of restricting normal use, poor oxidation resistance and corrosion resistance, and achieve light weight and improved High absorbing performance and high productivity

Active Publication Date: 2013-12-11
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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

Method used

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  • Ni/C composite nanofiber microwave absorbent, preparation method and application of absorbent
  • Ni/C composite nanofiber microwave absorbent, preparation method and application of absorbent
  • Ni/C composite nanofiber microwave absorbent, preparation method and application of absorbent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Add 0.9g of polyacrylonitrile (PAN) into a conical flask containing 8.3g of dimethylformamide (DMF), heat in a water bath at 50°C and stir magnetically for 3h until PAN is completely dissolved, then add 0.8g of Nickel acetylacetonate, continued magnetic stirring at room temperature for 15 hours to obtain a uniform, transparent and stable spinning solution. The mass fraction of PAN in the spinning solution is 9%, the mass fraction of nickel acetylacetonate is 8%, and the rest is the solvent DMF. The prepared spinning solution was moved into the electrospinning device, and the voltage was 15kV, the receiving distance was 15cm, the solution supply rate was 0.5mL / h, the spinneret diameter was 0.9mm, the ambient temperature was 20-25°C, and the humidity was Electrospinning was carried out under the condition of 35-45% to prepare PAN / nickel acetylacetonate composite precursor fibers, and the collected precursor fibers were put into an oven and dried at 80°C for 10h. The drie...

Embodiment 2

[0029] Basic process is the same as embodiment 1. The difference is: the content of PAN in the spinning solution is 7wt%, the content of nickel acetylacetonate is 4wt%, the pre-oxidation temperature is 240°C, and the carbonization temperature is 800°C. The average diameter of the obtained Ni / C composite nanofibers is about 140nm ; When the absorber loading is 3wt%, the coating thickness is 1.9mm, the minimum reflection loss is –38dB, the effective absorption bandwidth is 6.7GHz, and the frequency range is 8.8~15.5GHz.

Embodiment 3

[0031] Basic process is the same as embodiment 1. The difference is: the carbonization temperature is 1200°C, and the average diameter of the obtained Ni / C composite nanofibers is about 120nm; when the absorber loading is 3wt%, and the coating thickness is 1.8mm, the minimum reflection loss is –46dB, effectively The absorption bandwidth is 7.8GHz, and the frequency range is 10.2~18GHz.

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Abstract

The invention discloses a high-performance magnetic carbon-based composite nanofiber microwave absorbent and a preparation method thereof. Composite nanofibers are prepared by electrostatic spinning and a post heat treatment one-step method; a synthetic technology is simple; the mean diameters of the obtained fibers are 100-300nm; generated Ni nanoparticles are relatively uniformly distributed in or on the surfaces of the carbon nanofibers, and are wrapped by a graphitized carbon layer; and the absorbent has better oxidation resistance and corrosion resistance. The density of a wave absorption coating prepared by compositing with silica gel is only 0.8-1.0g/cm<3> when the content of the absorbent is 3-10wt%; when the thickness of the coating is 1.2-2.0mm, the minimum reflection loss of the absorbent reaches -36dB to -71dB; the effective absorption band width with the reflection loss less than -10dB at 2-18GHz reaches 9.7GHz; a whole Ku wave band and 5% of X wave band are covered; and the absorbent has the advantages of light mass, broadband, strong absorption, convenient adjustment of electromagnetic parameters, and the like.

Description

technical field [0001] The invention belongs to the field of electromagnetic wave absorbing materials, and in particular relates to a novel broad-band, light-weight, strong-absorbing one-dimensional magnetic carbon-based nanocomposite wave-absorbing material and a preparation method thereof. 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 improved the absorption performance of electromagnetic waves, but single-component absorbers are still difficul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
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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