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Fe-Ni alloy/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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  • 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-Ni alloy/C composite nanofiber microwave absorbent, preparation method and application of absorbent
  • Fe-Ni alloy/C composite nanofiber microwave absorbent, preparation method and application of absorbent
  • Fe-Ni alloy/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-Ni alloy / 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 nickel 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 and nickel acetylacetonate is 4-13% (preferably 6-10%), and the rest is solvent DMF.

[0022] (2) Move the prep...

Embodiment 1

[0026] Add 0.7g of PAN into a conical flask containing 8.6g of DMF, heat in a water bath at 50°C and stir magnetically for 3h until PAN is completely dissolved, then add 0.5133g of iron acetylacetonate and 0.1867g of nickel acetylacetonate, and continue the magnetic Stir for 15 hours to obtain a uniform, transparent and stable spinning solution. The mass fraction of PAN in the spinning solution is 7%, the mass fraction of the metal salt is 7%, and the rest is the solvent DMF. The prepared spinning solution was moved into the electrospinning device, and the voltage was 12kV, the receiving distance was 23cm, the solution supply rate was 0.3mL / h, the spinneret diameter was 0.8mm, the ambient temperature was 20-25°C, and the humidity was Under the condition of 35-45%, electrospinning is carried out to make PAN / acetylacetonate iron-nickel composite precursor fiber, and the collected precursor fiber is put into an oven and dried at 80°C for 10h. The dried precursor fibers were pre-...

Embodiment 2

[0028] Basic process is the same as embodiment 1. The difference is: the carbonization temperature is 1000°C, and the average diameter of the obtained Fe-Ni alloy / C composite nanofiber is about 280nm; when the coating thickness is 1.9mm, the minimum reflection loss reaches –41dB, and the effective absorption bandwidth is 9.2 GHz, the frequency range is 8.8-18GHz.

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Abstract

The invention discloses a high-performance Fe-Ni alloy / C composite nanofiber microwave absorbent and a preparation method thereof. The absorbent is prepared by electrostatic spinning and a post heat treatment one-step method; a synthetic technology is simple; the mean diameters of obtained fibers are 200-400nm; generated Fe-Ni alloy 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 -40dB to -95dB; 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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Patent Type & Authority Applications(China)
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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