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Method for preparing carbon nano tubes on surfaces of silicon carbide particles through in-situ synthesis

A technology of silicon carbide particles and carbon nanotubes, applied in silicon carbide, nanotechnology for materials and surface science, chemical instruments and methods, etc., can solve the problem of uneven size and distribution of metal particles, and poor final performance of composite materials. , can not catalytic performance and other problems, to reduce the calcination and reduction temperature, the process is simple and feasible, and the effect of saving energy

Active Publication Date: 2014-04-30
深圳优越科技新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These two patents both prepared carbon nanotubes, but these two patents mainly used the absorbing and catalytic properties of carbon nanotubes, and there were also many shortcomings: (1) Metal-silicon carbide composites prepared by impregnation method , the size and distribution of metal particles are not uniform, which can not play a good role in catalytic performance; (2) the use of carrier gas in chemical vapor deposition deposition can easily produce amorphous carbon, which will affect the performance of the material; (3) use Fe-Mg-Al composite catalysts may have adverse effects on the final properties of composites

Method used

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  • Method for preparing carbon nano tubes on surfaces of silicon carbide particles through in-situ synthesis
  • Method for preparing carbon nano tubes on surfaces of silicon carbide particles through in-situ synthesis
  • Method for preparing carbon nano tubes on surfaces of silicon carbide particles through in-situ synthesis

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Put nickel acetate tetrahydrate into a 150ml beaker, add 80ml deionized water, stir until clarified, add the surface-treated silicon carbide into the beaker at a molar ratio of 20:1 to nickel acetate tetrahydrate, and put it into an ultrasonic instrument Ultrasonic cleaning for 0.5 hours, take it out, put it on a magnetic stirrer, add 0.5mol / L NH while stirring 3 ·H 2 O aqueous solution, until the pH value is 7, continue magnetic stirring for 1 hour, let stand at room temperature for 48 hours, then rinse with deionized water, filter with suction; take out the powder in the funnel, put it in a drying oven at 100 °C, Dry for 10 hours, then put it into a box-type resistance furnace at 450°C, and calcinate for 2 hours in an air atmosphere. Nanoscale catalyst oxide particles are prepared on the surface of the catalyst.

[0033] Take 500 mg of processed powder, put it into a quartz boat, place it in a quartz tube furnace, raise the temperature to 500°C under an argon protec...

Embodiment 2

[0035]Put nickel acetate tetrahydrate into a 150ml beaker, add 50ml deionized water, stir until clarified, then add the surface-treated silicon carbide into the beaker at a molar ratio of 10:1 to nickel acetate tetrahydrate, and put it into the ultrasonic Ultrasonic cleaning in the instrument for 0.5 hours, take it out, put it on a magnetic stirrer, add 0.5mol / L NH3·H2O aqueous solution 8 while stirring, continue stirring for 1 hour, let it stand at room temperature for 48 hours, and then use Rinse with deionized water until the pH is neutral, and filter with suction; take out the powder in the funnel, put it in a drying oven at 150°C, dry for 10 hours, then put it in a box-type resistance furnace at 500°C, and calcinate 2 pieces in an air atmosphere Hour.

[0036] Take 500 mg of the treated powder, put it into a quartz boat, place it in a quartz tube furnace, raise the temperature to 550°C under an argon protective atmosphere of 500ml / min, turn off the argon, and introduce 30...

Embodiment 3

[0038] Put nickel acetate tetrahydrate into a 150ml beaker, add 50ml deionized water, stir until clarified, then add the surface-treated silicon carbide into the beaker at a molar ratio of 20:1 to nickel acetate tetrahydrate, and put it into the ultrasonic Ultrasonic cleaning in the instrument for 0.5 hours, take it out, put it on a magnetic stirrer, add 0.5mol / L ammonia solution while stirring until the pH value is 9, continue to stir for 1 hour, and let it stand at room temperature for 24 hours , and then rinsed with deionized water, suction filtered; the powder in the funnel was taken out, put into a drying oven at 120°C, dried for 10 hours, then put into a box-type resistance furnace at 500°C, and calcined for 2 hours in an air atmosphere.

[0039] Take 500 mg of processed powder, put it into a quartz boat, place it in a quartz tube furnace, raise the temperature to 500°C under an argon protective atmosphere of 500ml / min, turn off the argon, and pass in 300ml / min of hydroge...

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Abstract

The invention provides a method for growing multi-walled carbon nano tubes on the surface of micron silicon carbide powder in situ. The method comprises the steps of firstly oxidizing, acid-washing and alkali-washing the surface of the silicon carbide powder to remove silicon oxide and other impurities on the surface; secondly wrapping the surface of silicon carbide with a layer of uniformly distributed nano-catalyst particles by adopting the method of chemical codeposition, then putting the powder into a quartz tube furnace, and preparing the carbon nano tubes on the surface of silicon carbide in situ through catalytic cracking by utilizing the method of chemical vapor deposition. By adopting the method, uniform distribution of the carbon nano tubes on the surface of micron silicon carbide can be achieved, the difficulty that the carbon nano tubes are easy to agglomerate is solved, and a basis is provided for preparing high-performance multi-scale composite materials. The method is simple and has high feasibility. The prepared carbon nano tubes are uniformly dispersed on the surface of silicon carbide and are controllable in quantity.

Description

technical field [0001] The invention relates to the technical field of composite materials and their preparation, in particular to the field of preparing uniformly dispersed carbon nanotubes as reinforcing phases in composite materials by an in-situ autogenous method. Background technique [0002] Since carbon nanotubes were discovered by Iijima in 1991, due to their novel structure, unique mechanical, electrical and physical chemical properties and their potential uses, they have attracted great attention from the fields of chemistry, physics, materials and electronics at home and abroad. Especially the mechanical properties of carbon nanotubes are excellent: its average Young's modulus reaches 1.8TPa, which is about 100 times that of steel, its bending strength can reach 14.2GPa, and its stored strain energy can reach 100keV, showing super strong mechanical properties , and its density is low, the density of single-walled carbon nanotubes is about 1.2 ~ 1.3g / cm3, and the d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/36C01B31/02B82Y30/00B82Y40/00C01B32/162C01B32/956
Inventor 欧阳求保李士胜黄宇欧阳杰武张荻
Owner 深圳优越科技新材料有限公司
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