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Fe-Co alloy/C composite nanofiber microwave absorbent, and preparation method and application thereof

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

Active Publication Date: 2013-12-04
浙江润优新材料科技有限公司
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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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  • Fe-Co alloy/C composite nanofiber microwave absorbent, and preparation method and application thereof
  • Fe-Co alloy/C composite nanofiber microwave absorbent, and preparation method and application thereof
  • Fe-Co alloy/C composite nanofiber microwave absorbent, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The preparation method of Fe-Co / C composite nanofiber microwave absorber of the present invention, concrete steps are as follows:

[0028] Step 1, 0.7g polyacrylonitrile (PAN, average molecular weight 150,000) was added to a conical flask filled with 8.6g dimethylformamide (DMF), heated in a water bath at 50°C and magnetically stirred for 3h until PAN was completely dissolved, Then add 0.4653g iron acetylacetonate and 0.2347g cobalt acetylacetonate, and continue magnetic stirring at normal temperature for 15h to obtain a uniform, transparent and stable spinning solution. The mass fraction of PAN in this spinning solution is 7%, and the amount of metal salt The mass fraction is 7%, the ratio of the amount of the two substances is 2:1, and the rest is solvent DMF;

[0029] Step 2, move the prepared spinning solution into the electrospinning device, under the conditions of voltage of 12kV, receiving distance of 23cm, solution supply rate of 0.3mL / h, spinneret diameter of 0...

Embodiment 2

[0033]The basic process of the preparation method of the Fe-Co / C composite nanofiber microwave absorber of embodiment 2 is the same as embodiment 1, and different from embodiment 1 is: in embodiment 2 spinning solutions, the quality of iron acetylacetonate and cobalt acetylacetonate is respectively 0.5318 and 0.2682g, the metal salt content is 8wt%, and the carbonization temperature is 1000°C, the average diameter of the obtained Fe-Co alloy / C composite nanofiber microwave absorber is about 190nm.

[0034] Using silica gel as the matrix, the Fe-Co alloy / C composite nanofiber microwave absorber prepared in Example 2 was evenly mixed with silica gel to form a single-layer wave-absorbing coating. mm, the minimum reflection loss reaches –96dB, the effective absorption bandwidth is 7.5GHz, and the frequency range is 8.1~15.6GHz.

Embodiment 3

[0036] The basic process of the preparation method of the Fe-Co / C composite nanofiber microwave absorber of embodiment 3 is the same as that of embodiment 1, and the difference from embodiment 1 is that the masses of iron acetylacetonate and cobalt acetylacetonate in embodiment 3 are respectively 0.2659 and 0.1341g , the metal salt content is 4wt%, the pre-oxidation temperature is 260 ℃, and the carbonization temperature is 1200 ℃. The average diameter of the obtained Fe-Co alloy / C composite nanofiber microwave absorber is about 260nm.

[0037] Using silica gel as the matrix, the Fe-Co alloy / C composite nanofiber microwave absorber prepared in Example 3 was evenly mixed with silica gel to form a single-layer wave-absorbing coating. mm, the minimum reflection loss is –67dB, the effective absorption bandwidth is 6.6GHz, and the frequency range is 9.1~15.7GHz.

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Abstract

The invention discloses a Fe-Co alloy / C composite nanofiber microwave absorbent. The Fe-Co alloy / C composite nanofiber microwave absorbent comprises Fe-Co alloy nanoparticles and carbon nanofiber, wherein the Fe-Co alloy nanoparticles are distributed in the carbon nanofiber or on the surface of the carbon nanofiber uniformly, and are wrapped by a graphitized carbon layer. The invention also discloses a preparation method of the Fe-Co alloy / C composite nanofiber microwave absorbent. The method combines electrostatic spinning with later-stage heat treatment to prepare the Fe-Co alloy / C composite nanofiber microwave absorbent by a one-step method, is simple in process, low in cost and high in yield, and can continuously prepare a large amount of the target product Fe-Co alloy / C composite nanofiber microwave absorbents. The Fe-Co alloy / C composite nanofiber microwave absorbent prepared by the method is a wave absorbing material with excellent comprehensive performance, has the advantages of light weight, wideband, strong absorption performance, convenient, adjustable electromagnetic parameters and the like, and has an excellent application prospect in the technical fields of electromagnetic stealth, electromagnetic shielding, resistance to electromagnetism radiation interference and the like.

Description

technical field [0001] The invention relates to a Fe-Co alloy / C composite nanofiber microwave absorber, and also relates to a preparation method and application of the Fe-Co alloy / C composite nanofiber microwave absorber, belonging to the field of electromagnetic wave absorbing materials. 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 difficult t...

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 浙江润优新材料科技有限公司
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