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Wave-absorbing SiBCN nanofiber and preparation method thereof

A nanofiber and wave type technology, applied in the chemical characteristics of fibers, textiles and papermaking, etc., can solve the problems of poor electromagnetic wave absorption performance, achieve excellent wave transmission performance, good dielectric performance, and improve the effect of impedance mismatch.

Active Publication Date: 2021-05-28
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem of poor electromagnetic wave absorption performance of SiBCN ceramics in the prior art above, the present invention provides a wave-absorbing SiBCN nanofiber, and further provides a preparation method of the wave-absorbing SiBCN nanofiber

Method used

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  • Wave-absorbing SiBCN nanofiber and preparation method thereof
  • Wave-absorbing SiBCN nanofiber and preparation method thereof
  • Wave-absorbing SiBCN nanofiber and preparation method thereof

Examples

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preparation example Construction

[0042] Another embodiment of the present invention provides the above-mentioned preparation method of absorbing SiBCN nanofibers, combined with figure 1 shown, including the following steps:

[0043] S1. Preparation of spinning solution: under an inert atmosphere, the colloidal polysilaborazane solid is dissolved in anhydrous dichloromethane, and after ultrasonic dispersion, it is left to stand to obtain a spinning solution for electrospinning;

[0044] S2, electrospinning: injecting the spinning solution of step S1 into an electrospinning device for electrospinning to obtain polysilaborazane spinning fibers;

[0045] S3, curing and cross-linking: under an inert atmosphere, the polysilaborazane spinning fiber in step S2 is heated from room temperature to 150-250° C. and kept at a temperature for curing and cross-linking;

[0046] S4, high temperature cracking: in an inert atmosphere, the polysilaborazane spinning fibers after curing and crosslinking in step S3 are heated to 1...

Embodiment 1

[0061] A preparation method of a wave-absorbing SiBCN nanofiber, comprising the following steps:

[0062] S1. Preparation of spinning solution: under an inert atmosphere, dissolve 5 g of polysilaborazane colloidal solid in 5 g of anhydrous dichloromethane, stir magnetically for 2 hours at room temperature, and then use an ultrasonic instrument to fully disperse the solution, and then statically Set for 0.5h to obtain a uniform and transparent spinning solution for electrospinning;

[0063] S2. Electrospinning: inject the spinning solution in step S1 into an electrospinning device for electrospinning to obtain polysilaborazane spinning fibers. The parameters of the electrospinning are: the fiber receiving device is an aluminum plate , plus a needle-tip auxiliary electrode, the receiving distance is 10cm, the solution advancing speed is 25μL / min, the working voltage is 15kV, the ambient humidity is 30%, and the ambient temperature is controlled at 25°C; the polysilaborazane spin...

Embodiment 2

[0070] Example 2 is basically the same as Example 1, with the difference that: in step S1, spinning solutions with polysilaborazane colloidal solid mass concentrations of 40%, 45%, 50%, and 55% are prepared respectively for subsequent step S2. -S4, and in step S4, the polysilaborazane spinning fiber after curing and crosslinking in step S3 is heated from 200°C to 1600°C at a rate of 5°C / min under an inert atmosphere and kept for 2 hours.

[0071] The morphologies of SiBCN nanofibers obtained by spinning solutions with different concentrations are as follows: Image 6 shown, by Image 6 It can be seen that the fiber prepared by using the spinning solution with a mass concentration of 50% has a smooth surface and a complete morphology, which is the preferred mass concentration.

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Abstract

The invention provides a wave-absorbing SiBCN nanofiber and a preparation method thereof, and belongs to the technical field of ceramic wave-absorbing materials. The microcosmic phase structure of the wave-absorbing SiBCN nanofiber is composed of a silicon carbide phase, a free carbon phase and a silicon-boron-carbon-nitrogen amorphous matrix phase, wherein the silicon carbide phase and the free carbon phase are dispersed in the silicon-boron-carbon-nitrogen amorphous matrix phase. The SiBCN amorphous matrix phase in the SiBCN nanofiber is an electric insulation matrix and has excellent wave transmission performance, and the SiC phase and the free carbon phase have good dielectric properties, so that impedance mismatch between the SiBCN nanofiber and a free space can be improved, and incident electromagnetic waves can permeate into the SiBCN nanofiber from an air medium as much as possible, and is converted into internal energy. The conductive phase which is composed of the SiC phase and the free carbon phase and is uniformly distributed in the electric insulation matrix can further adjust the dielectric constant of the material, and high dielectric loss is caused so as to enhance the electromagnetic wave absorption capability of the SiBCN nanofiber.

Description

technical field [0001] The invention relates to the technical field of ceramic wave-absorbing materials, in particular to a wave-absorbing SiBCN nanofiber and a preparation method thereof. Background technique [0002] With the rapid development of modern electronic communication, it not only provides basic communication guarantee, but also gradually realizes the rapid transmission of information. The resulting electromagnetic radiation and interference make the space electromagnetic environment increasingly complex, and electromagnetic pollution has become a topic and hot issue that people pay more and more attention to in their actual lives. Everyday household appliances, mobile phones, computers and electronic equipment will generate a large amount of electromagnetic wave radiation, which makes electromagnetic wave absorbing materials attract more and more attention. [0003] Traditional absorbing materials mainly include ferrite, metal alloy, graphite, etc., which have ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/58C04B35/565C04B35/622D01F9/10
CPCC04B35/58C04B35/565C04B35/62272C04B35/62281D01F9/10
Inventor 李达鑫陈庆庆贾德昌杨治华蔡德龙周玉高巍
Owner HARBIN INST OF TECH
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