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Preparation method of high-purity silicon carbide nano fibers

A technology of silicon carbide fibers and carbon nanotubes is applied in the field of preparation of high-purity nano-silicon carbide fibers to achieve the effects of high purity, simple process and low cost

Inactive Publication Date: 2012-07-11
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Method used

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Examples

Experimental program
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Embodiment

[0017] (1) Add 4g of carbon nanotubes to a 50ml beaker, add 35ml of distilled water and ultrasonically vibrate for 10 minutes, then add 1.2g of sodium dodecylbenzenesulfonate, and continue ultrasonically for 5 hours; add distilled water to dilute to 550ml, and Centrifuge at a speed of 11000r / min, remove the supernatant; dry the precipitate in an oven at 90°C for 6 hours, take it out, grind it into powder, and obtain hydrophilic carbon nanotubes;

[0018] (2) 50ml volume percent is 25-28% ammoniacal liquor and 100ml distilled water are mixed, then add 165ml dehydrated alcohol, after magnetic stirring 5 minutes under normal temperature, add the hydrophilic carbon nanotube that 3g step (1) makes, then Stir for 5 minutes to obtain a uniform dispersion of carbon nanotubes;

[0019] (3) Add 20 ml of tetraethyl orthosilicate dropwise to the carbon nanotube dispersion obtained in step (2), start the sol-gel reaction, continue stirring for 48 hours, and control the temperature at 30° C...

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Abstract

The invention discloses a preparation method of high-purity silicon carbide nano fibers. The method comprises the following steps of: (1) performing hydrophilic surface treatment to a carbon nano tube; (2) enabling the carbon nano tube modified hydrophilically to carry out sol-gel process, so as to prepare uniform mixture of the carbon nano tube and SiO2 gel; and (3) heating the mixture to be 500-700 DEG C and maintaining the temperature for 1-3 hours, raising the temperature to be 1350-1650 DEG C and maintaining the temperature for 1-4 hours, thereby obtaining the high-purity silicon carbide nano fibers. The silicon carbide nano fibers prepared by adopting the method have high purity, simple process and low cost, any catalyst does not need to be introduced during reaction, and batch production is easy to realize.

Description

technical field [0001] The invention relates to a method for preparing high-purity silicon carbide nanofibers by using carbon nanotubes to react with sol-gel silicon dioxide at high temperature, which is characterized in that silicon dioxide prepared by a sol-gel process is used as a silicon source and Carbon nanotubes are the carbon source, and high-purity silicon carbide nanofibers are made through a reasonable heating process under the protection of argon. Background technique [0002] Silicon carbide (SiC) nanofibers have excellent properties such as high strength, high modulus, high temperature resistance, corrosion resistance, oxidation resistance, low density, and adjustable resistivity. They are mainly used in high temperature resistant ceramic matrix composites, metal matrix composites, Electromagnetic wave absorbing materials are widely used in metallurgy, electronics, weapons, aerospace and other industries. High-temperature carbothermal reduction of silicon diox...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/36B82Y40/00C01B32/97
Inventor 罗鲲李正方
Owner GUILIN UNIVERSITY OF TECHNOLOGY