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Magnetic alloy/dielectric oxide composite nanofiber and preparation method thereof, and wave-absorbing coating prepared by adopting nanofiber

A technology of composite nanofibers and magnetic alloys, applied in the directions of coating, fiber treatment, fiber chemical characteristics, etc., to achieve the effect of high yield, wide frequency band, and strong absorption

Active Publication Date: 2017-05-10
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, so far, research on ferromagnetic metal / dielectric oxide nanocomposite absorbing materials has mainly focused on zero-dimensional nanomaterials such as nanocapsules and core-shell microspheres. and applications are rarely reported

Method used

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  • Magnetic alloy/dielectric oxide composite nanofiber and preparation method thereof, and wave-absorbing coating prepared by adopting nanofiber
  • Magnetic alloy/dielectric oxide composite nanofiber and preparation method thereof, and wave-absorbing coating prepared by adopting nanofiber
  • Magnetic alloy/dielectric oxide composite nanofiber and preparation method thereof, and wave-absorbing coating prepared by adopting nanofiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Preparation of composite nanofibers: according to the ferromagnetic phase Fe 2 The molar ratio of the Co alloy to the dielectric phase ZnO is 1:1. Weigh 0.6622g of cobalt nitrate, 1.8384g of iron nitrate and 0.4994g of zinc acetate into the conical flask, and add N,N-dimethylformamide ( 7.5g each of DMF) and ethanol (that is, the mass ratio is 1:1), magnetically stirred until all metal salts are completely dissolved, then 2g of PVP (average molecular weight: 1300000) was added to the solution, and magnetically stirred for about 3 to 5 hours to form A homogeneous, transparent and stable spinning solution, wherein the mass percentages of PVP and metal salts are 10% and 12% respectively. The prepared solution was electrospun under the conditions of voltage intensity 1kV / cm (i.e. voltage 20kV, receiving distance 20cm), solution propulsion rate 0.5mL / h, ambient temperature 20-25°C, and relative humidity 30-40%. Form PVP / metal salt composite precursor fiber. Dry the collect...

Embodiment 2

[0026] Basic process is the same as embodiment 1, and difference is: Fe in the product 2 The molar ratio of Co to ZnO is 2:8, the masses of cobalt nitrate, iron nitrate, and zinc acetate are 0.4416g, 1.2261g, and 1.3323g respectively, and the chemical composition is obtained as (Fe 2 Co) 0.2 -(ZnO) 0.8 The composite nanofiber microwave absorber has an average diameter of about 200nm.

[0027] The wave-absorbing coating prepared by using the composite nanofiber, when the absorber content is 50wt%, and the coating thickness is 1mm, the minimum reflectance of the single-layer composite nanofiber / silica gel wave-absorbing coating is at 17.8GHz, reaching -73.9 dB; when the coating thickness varies from 1 to 3mm, the absorption frequency range with reflection loss lower than -20dB is 5 to 18GHz, and the bandwidth reaches 13GHz, covering 75% of the C-band and the entire X and Ku-band.

Embodiment 3

[0029] The basic process is the same as in Example 1, except that the molar ratio of Fe and Co in the Fe-Co alloy is 1:2, and the masses of cobalt nitrate, iron nitrate, and zinc acetate are 0.9844g, 0.6833g, and 1.3323g respectively, and the chemical composition for (FeCo 2 ) 0.5 -(ZnO) 0.5 The ferromagnetic / dielectric composite nanofiber microwave absorber has an average diameter of about 200nm.

[0030] The wave-absorbing coating prepared by using the composite nanofiber, when the absorber content is 50wt%, and the coating thickness is 1.3mm, the minimum reflectance of the single-layer composite nanofiber-silica gel wave-absorbing coating reaches -81.5 at 17.1GHz dB; when the coating thickness varies from 1 to 3mm, the absorption frequency range of reflection loss below -20dB is 5.8-18.0GHz.

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Abstract

The invention discloses a magnetic alloy / dielectric oxide composite nanofiber and a preparation method thereof, and a wave-absorbing coating prepared by adopting the nanofiber. The magnetic alloy / dielectric oxide composite nanofiber comprises magnetic alloy and dielectric oxide, wherein the magnetic alloy and the dielectric oxide particles are distributed in the axial direction of the nanofiber. The preparation method comprises the steps: mixing the magnetic alloy and dielectric oxide metal salt uniformly and dissolving the mixture in a solvent to prepare a spinning solution; and adopting an electrostatic spinning technology to prepare a PVP / metal salt precursor fiber from the spinning solution, drying, roasting and reducing to prepare the composite nanofiber. The thickness of the wave-absorbing coating prepared by adopting the composite nanofiber is 1 to 3 mm. The magnetic alloy / dielectric oxide composite nanofiber and the preparation method thereof, and the wave-absorbing coating prepared by adopting the nanofiber have the advantages that the composite fiber is thin, wide in frequency band and high in absorptivity, and can strongly absorb almost the whole frequency band of 2 to 18 GHz; and the electromagnetic parameters and the microwave absorbing characteristic of the fiber can be regulated and controlled conveniently in a wide range by changing the proportion of a ferromagnetic phase and a dielectric phase and the chemical constitution.

Description

technical field [0001] The invention belongs to the field of electromagnetic wave absorbing materials, and in particular relates to a magnetic alloy / dielectric oxide composite nanofiber, a preparation method and a wave-absorbing coating prepared by using the fiber. Background technique [0002] With the widespread application of GHz frequency band electromagnetic waves in the field of electronic communication such as mobile phones, wireless local area networks, radar systems, etc., the resulting electromagnetic radiation and interference are becoming more and more serious, which not only poses potential hazards to human health, but also may On the other hand, modern and future warfare requires reducing the radar cross section of weapons and equipment as much as possible to achieve electromagnetic stealth and improve survivability and penetration capabilities. Therefore, in order to solve the problem of electromagnetic interference and pollution, as well as the stealth of mil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/08D01F9/10D01F8/18D01D5/30C09D5/32C09D183/04C09D7/12C08K7/06C08K7/08
CPCC08K7/06C08K7/08C09D5/32C09D7/70C09D183/04D01D5/30D01F8/18D01F9/08D01F9/10
Inventor 向军张雪珂李佳乐吴志鹏刘敏
Owner JIANGSU UNIV OF SCI & TECH
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