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Magnetic metal doped vanadium nitride nano-composite fiber microwave absorbent and preparation method thereof

A technology of vanadium nitride nanometer and microwave absorber, applied in chemical instruments and methods, chemical characteristics of fibers, other chemical processes, etc., can solve the problems of easy agglomeration, reducing magnetic permeability and magnetic loss, and deteriorating wave absorbing performance, etc. Achieving good absorbing performance, large aspect ratio, and improving absorbing performance

Pending Publication Date: 2020-03-20
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to its large specific surface area, it is easy to agglomerate, thereby reducing the magnetic permeability and magnetic loss, and deteriorating the absorbing performance.

Method used

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  • Magnetic metal doped vanadium nitride nano-composite fiber microwave absorbent and preparation method thereof
  • Magnetic metal doped vanadium nitride nano-composite fiber microwave absorbent and preparation method thereof
  • Magnetic metal doped vanadium nitride nano-composite fiber microwave absorbent and preparation method thereof

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preparation example Construction

[0035] The invention discloses a magnetic metal-doped vanadium nitride nanocomposite fiber microwave absorber and a preparation method thereof, comprising the following steps:

[0036] S1. Add 1-2g of vanadyl acetylacetonate and 0.5-2g of polyvinylpyrrolidone into 10mL of N,N-dimethylformamide solvent, stir and dissolve, then add magnetic metal precursor to the mixed solution, and place the mixture in Stir at room temperature (25°C) for 6-12 hours to obtain an electrospinning solution with a certain viscosity, vanadyl acetylacetonate: polyvinylpyrrolidone: N,N-dimethylformamide solvent = 1mmol: (0.5-3mmol): (0.5 ~3mmol): 10ml;

[0037] The magnetic metal precursor is iron acetate, nickel acetate or cobalt acetate.

[0038] S2. Choose 20-23 stainless steel needles, set the distance from the needle to the collector as 15-25cm, the electrostatic field voltage as 15-30kV, and the pushing speed as 0.45-1.5mL / h to obtain one-dimensional nanofibers. The fibers are stacked on top of...

Embodiment 1

[0042] Add 1g of vanadyl acetylacetonate and 1g of polyvinylpyrrolidone into 10mL of N,N-dimethylformamide solvent, stir and dissolve, then add 0.7g of iron acetate to the mixed solution, and place the mixture at room temperature (25°C) Stir for 12 hours to obtain a uniformly dispersed electrospinning solution with a certain viscosity;

[0043] Inject the spinning solution into a 10mL syringe with a plastic spray gun head, select a stainless steel needle of No. 23 specification, inject the injection speed at 0.45mL / h, the distance between the spinneret and the collector is 25cm, and the spinning voltage is 15kV , the indoor temperature is 24°C, and the relative humidity is 25% to 30%. With the volatilization of the solvent, the precursor nanofibers can be obtained on the collector;

[0044] Put the precursor nanofibers into a box furnace, raise the temperature at 3°C / min to 100°C for 4 hours, and naturally cool to room temperature to obtain pre-oxidized nanofibers;

[0045] P...

Embodiment 2

[0048] Add 1.5g of vanadyl acetylacetonate and 2g of polyvinylpyrrolidone into 10mL of N,N-dimethylformamide solvent, stir and dissolve, then add 0.5g of cobalt acetate to the mixed solution, and place the mixture at room temperature (25°C ) stirring for 8 hours to obtain a uniformly dispersed electrospinning solution with a certain viscosity;

[0049] Inject the spinning solution into a 10mL syringe with a plastic spray gun head, select a stainless steel needle of No. 20 specification, inject the injection speed at 0.7mL / h, the distance between the spinneret and the collector is 15cm, and the spinning voltage is 20kV , the indoor temperature is 24°C, and the relative humidity is 25% to 30%. With the volatilization of the solvent, the precursor nanofibers can be obtained on the collector;

[0050] Put the precursor nanofibers into a box furnace, raise the temperature at 5°C / min to 200°C for 2 hours, and naturally cool to room temperature to obtain pre-oxidized nanofibers;

[...

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Abstract

The invention discloses a magnetic metal doped vanadium nitride nano-composite fiber microwave absorbent and a preparation method thereof. Vanadium acetylacetonate and polyvinylpyrrolidone are added into a N,N-dimethylformamide solvent, and dissolved via stirring to acquire a mixed solution; then a magnetic metal precursor is added into the mixed solution, and the mixed solution is stirred under room temperature to acquire electrospinning fluid; the acquired electrospinning fluid is formed into one-dimensional nanofibers via electrospinning; the prepared nanofibers are subjected to pre-oxidation, and then nitrogen treatment is performed to acquire the Fe / (Co,Ni)VN / C nanofiber electromagnetic microwave absorbent. The magnetic metal doped vanadium nitride nano-composite fiber microwave absorbent prepared according to the invention is complete in shape, large in length-diameter ratio, stable in structure, simple in preparation method, excellent in repeatability and good in microwave absorption performance, and effectively improves the microwave absorption performance of vanadium nitride.

Description

technical field [0001] The invention belongs to the technical field of microwave absorbing materials, and in particular relates to a magnetic metal-doped vanadium nitride nanocomposite fiber microwave absorber and a preparation method thereof. Background technique [0002] In recent years, with the rapid development of the electrical and electronic industry, the problem of electromagnetic radiation has become increasingly serious. In the military field, the radar stealth of military targets can achieve rapid and precise strikes on enemy targets on the premise of ensuring the safety of their own weapons and equipment. Electromagnetic wave absorbing materials can attenuate and absorb electromagnetic waves by converting electromagnetic energy into heat energy and other forms of energy, which can solve the problems of electromagnetic pollution and radar stealth to a large extent. Therefore, based on the needs of national defense and electromagnetic pollution protection, it is i...

Claims

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Application Information

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IPC IPC(8): D01F9/21C09K3/00
CPCC09K3/00D01F9/21
Inventor 原晓艳王瑞琴黄文瑞黄圣琰沙爱明郭守武
Owner SHAANXI UNIV OF SCI & TECH
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