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Flexible silicon carbide nanofiber/carbon nanofiber composite felt material and preparation method thereof

A technology of carbon nanofibers and nanofibers, which is applied in the direction of heating/cooling fabrics, textiles and papermaking, and fabric surface trimming, etc., which can solve the problems of high production costs, decreased purity of SiC nanofibers, and high prices, and achieve easy recycling and reuse , Excellent cycle performance, good thermal stability

Active Publication Date: 2020-04-10
苏州纤创智造新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the one hand, the addition of rare earth metals and other additives will adhere to the prepared SiC crystal structure, reducing the purity of the obtained SiC nanofibers; on the other hand, most of the rare earth metals are expensive and are scarce resources, making this preparation method relatively high production costs

Method used

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  • Flexible silicon carbide nanofiber/carbon nanofiber composite felt material and preparation method thereof
  • Flexible silicon carbide nanofiber/carbon nanofiber composite felt material and preparation method thereof
  • Flexible silicon carbide nanofiber/carbon nanofiber composite felt material and preparation method thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0038] Specifically, as a possible implementation mode, the preparation method of the flexible SiC nanofiber / carbon nanofiber composite felt material in the present invention includes the following steps:

[0039] (1) Preparation of precursor solution: weigh a certain mass of silicon source and add it into a polar solvent, then stir at room temperature for 4-8 hours. After fully dispersed, add a certain mass of polymer-based carbon precursor, continue to stir for 4-12 hours, and stand for defoaming before use.

[0040] (2) Precursor forming: the precursor solution obtained in step (1) is subjected to solution jet spinning, gas-electric blending or centrifugal spinning to prepare a precursor nanofiber mat.

[0041] (3) Heat treatment of precursor nanofiber felt: put the precursor nanofiber felt obtained in step (2) into a calciner for pre-oxidation treatment, and then place it in a high temperature furnace under an inert gas atmosphere to carry out high temperature carbonizatio...

Embodiment 1

[0052] S11, preparation of precursor solution: 30g of SiO 2 Nanoparticles (particle size: 7-40nm) were added into 1000ml of N,N-dimethylformamide solvent, stirred and dispersed at room temperature for 4h. After adding 140g of polyacrylonitrile (molecular weight M w =50,000), continue stirring for 12h to form a homogeneous mixed solution, which is filtered through an 800-mesh filter for subsequent use.

[0053] S12, precursor forming: pump the precursor solution in step S11 into a metering pump for solution jet spinning. The propulsion speed is 800ml / h, the hot air temperature in the tunnel is 55°C, and the air flow rate at the inlet and outlet is 1200m 3 / h, the spinneret hole diameter is 0.5mm.

[0054] S13, heat treatment of the precursor nanofiber mat: put the fibrous precursor in step S12 into a calciner at a heating rate of 5°C / min, raise the temperature to 250°C and keep it warm for 2h, and perform pre-oxidation under air conditions; Carry out carbonization treatment...

Embodiment 2

[0058] Adjust the holding time in the high-temperature carbonization step in Step S13 of Example 1 to 1 h, and the rest of the steps are the same as in Example 1 to obtain a flexible SiC nanofiber / carbon nanofiber composite felt material.

[0059] The structural performance of the nanofiber composite mat that the present embodiment makes is as follows Figure 5 As shown, the SiC nanofiber structure is in the shape of a spiral hook, and the diameter distribution is relatively uniform at 80-100 nm.

[0060] According to the experimental test, the catalytic degradation methyl orange solution of the flexible SiC nanofiber / carbon nanofiber composite felt in this example is lower than that of Example 1, the removal efficiency is about 85%, and the removal rate is about 84% after repeated use for 5 times.

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Abstract

The invention provides a flexible silicon carbide nanofiber / carbon nanofiber composite felt material and a preparation method thereof. The method comprises the following steps of firstly, preparing aprecursor solution by adopting different types of silicon sources, a polymer-based carbon source and a polar solvent, and then forming the precursor solution through a spinning technology to obtain afibrous precursor; and finally, carrying out pre-oxidation and high-temperature carbonization on the fibrous precursor to obtain the flexible silicon carbide nanofiber / carbon nanofiber composite feltmaterial. The length of prepared silicon carbide nanofiber is tens to thousands of microns, the diameter is 80-300 nm, the preparation process is simple and efficient, rare earth metal is not needed to serve as a catalyst, and the prepared flexible silicon carbide nanofiber / carbon nanofiber composite felt material is fluffy and soft and is good in mechanical property, perfect in crystal structure,relatively high in catalytic degradation performance, excellent in recycling performance and easy to recycle.

Description

technical field [0001] The invention relates to the technical field of ceramic matrix composite materials, in particular to a flexible silicon carbide nanofiber / carbon nanofiber composite felt material and a preparation method thereof. Background technique [0002] Silicon carbide (SiC) is a new type of special ceramic material with excellent properties such as high temperature resistance, oxidation resistance, corrosion resistance, high strength, and high modulus. It is widely used in many fields such as ceramics and wear-resistant materials. One-dimensional SiC nanomaterials not only have the basic characteristics of SiC matrix materials, but also have the unique geometric structure and special properties of one-dimensional nanomaterials. One-dimensional SiC nanofiber materials have great potential application value in high-frequency, high-power semiconductor devices and intelligent nano-optoelectronics. [0003] Since 1975, Professor Yajima successfully prepared SiC fibe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D04H1/4382D06C7/04
CPCD04H1/4382D06C7/04
Inventor 韩春梅李先锋
Owner 苏州纤创智造新材料科技有限公司
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