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

A technology of composite nanofibers and microwave absorbers, applied in the direction of fiber chemical characteristics, radiation-absorbing coatings, chemical instruments and methods, etc., can solve the problems of poor anti-oxidation and corrosion resistance, limit normal use, etc., and achieve improved microwave absorption The effect of performance, light weight and high productivity

Active Publication Date: 2013-12-11
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 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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  • Fe/C composite nanofiber microwave absorbent, preparation method and application of absorbent
  • Fe/C composite nanofiber microwave absorbent, preparation method and application of absorbent
  • Fe/C composite nanofiber microwave absorbent, preparation method and application of absorbent

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preparation example Construction

[0020] The method for preparing the Fe / C composite nanofiber microwave absorber provided by the invention mainly includes the preparation of the solution, the electrospinning process of the precursor fiber and its preoxidation and carbonization treatment. The specific steps are:

[0021] (1) Add a certain amount of polyacrylonitrile (PAN, average molecular weight 150,000) into an appropriate amount of solvent dimethylformamide (DMF), heat in a water bath at 50-70°C and magnetically stir for 2-5 hours until PAN is completely dissolved, Then add a certain amount of iron acetylacetonate and continue magnetic stirring at room temperature for 10-15 hours to obtain a uniform, transparent and stable spinning solution. The mass fraction of PAN in the spinning solution is 5-12% (preferably 6-10%), the mass fraction of iron acetylacetonate is 4-13% (preferably 6-10%), and the rest is solvent DMF.

[0022] (2) Move the prepared spinning solution into the electrospinning device, at a vol...

Embodiment 1

[0026] Weigh 0.9g PAN into the Erlenmeyer flask, then slowly add 8.3g DMF into the Erlenmeyer flask, heat the Erlenmeyer flask in a water bath at 50°C and magnetically stir for 3h until the PAN is completely dissolved, then add the PAN / DMF 0.8 g of iron acetylacetonate was added to the solution, and magnetic stirring was continued at room temperature for 15 hours to obtain a uniform and stable spinning solution, in which the content of PAN was 9 wt%, and the content of iron acetylacetonate was 8 wt%. Pour the prepared spinning solution into a syringe and install it on a micro-injection pump. The voltage is 15kV, the receiving distance is 15cm, the advancing speed is 0.5mL / h, the diameter of the spinneret is 0.9mm, and the room temperature is 20-25°C , Spinning is carried out under the condition of relative humidity of 40-50%. After spinning, the collected precursor fibers were put into an oven and dried at 100°C for 12 hours, and then placed in a program-controlled box-type el...

Embodiment 2

[0028] Basic process is the same as embodiment 1. The difference is: the content of PAN in the spinning solution is 7wt%, the content of iron acetylacetonate is 7wt%, the voltage is 12kV, the receiving distance is 20cm, the advancing speed is 0.3mL / h, the diameter of the spinneret is 0.8mm, and the pre-oxidation temperature The temperature is 240℃, the pre-oxidation time is 3h, and the average diameter of the obtained Fe / C composite nanofibers is about 250nm; when the thickness of the prepared wave-absorbing coating is 1.7mm, the minimum reflection loss reaches –73dB, and the effective absorption bandwidth It is 8.3GHz, and the frequency range is 9.7~18GHz.

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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; the mean diameters of the composite nanofibers are 150-500 nm; generated Fe 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 thickness of the coating is 1.2-2.0mm, the minimum reflection loss of the absorbent reaches -35dB to -75dB; the effective absorption band width with the reflection loss less than -10dB at 2-18GHz reaches 10.2GHz; a whole Ku wave band and an 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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IPC IPC(8): D01F9/22D01F1/10C09K3/00C09D5/32
Inventor 向军张雄辉李佳乐叶芹徐加焕
Owner JIANGSU UNIV OF SCI & TECH
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