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Preparation method of fibrous nano silicon carbide

A nano-silicon carbide and fibrous technology, applied in the field of compound preparation, can solve the problems of environmental pollution, low yield, high cost, etc., and achieve the effect of simple equipment and process

Inactive Publication Date: 2014-01-08
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the methods for preparing silicon carbide in the prior art generally have disadvantages such as complex production process, high cost, low yield and easy to cause environmental pollution.

Method used

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  • Preparation method of fibrous nano silicon carbide

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Fiber serpentine (SiO 2 ), the carbon airgel was dried in a vacuum drying oven (300-1000Pa, 50-80°C, 3-12h), and an appropriate amount of fiber serpentine (SiO 2 ), carbon aerogels, grind them separately, pass through a 200-mesh sieve, take samples at a molar ratio of 2:1, and mix them evenly; the mixed mixture should have a bulk density of 0.3-1.5 g / cm 3 Put it into the alumina crucible of the tubular atmosphere furnace, evacuate it to 0.001MPa, and continuously feed high-purity argon gas (purity 99.99%, protective atmosphere) into the reaction device, then raise the temperature to 1350 ° C, the sample reacts, and keep warm for 0.2 After ~6h, cool down to room temperature, stop feeding the protective atmosphere, collect the combustion products, and obtain fibrous nano-silicon carbide powder after fine grinding.

Embodiment 2

[0028] Fiber serpentine (SiO 2 ) and graphene in a vacuum drying oven (300-1000Pa, 50-80°C, 3-12h), take an appropriate amount of fiber serpentine (SiO 2 ), graphene, grind them separately, pass through a 200-mesh sieve, take samples at a molar ratio of 2:1, and mix them evenly; the mixed mixture should have a bulk density of 0.3-1.5 g / cm 3 Put it into the alumina crucible of the tubular atmosphere furnace, evacuate it to 0.001MPa, and continuously feed high-purity argon gas (purity 99.99%, protective atmosphere) into the reaction device, then raise the temperature to 1400 ° C, the sample reacts, and keep warm for 0.2 After ~6h, cool down to room temperature, stop feeding the protective atmosphere, collect the combustion products, and obtain fibrous nano-silicon carbide powder after fine grinding.

Embodiment 3

[0030] Fiber serpentine (SiO 2 ), carbon black in a vacuum drying oven (300-1000Pa, 50-80°C, 3-12h), then take an appropriate amount of fiber serpentine (SiO 2 ), carbon black, grind them separately, pass through a 200-mesh sieve, take samples at a molar ratio of 1:1, and mix them evenly; the mixed mixture should have a bulk density of 0.3-1.5 g / cm 3 Put it on the refractory material of the high-temperature self-propagating reaction technology preparation device, evacuate to 0.001MPa, and continuously feed high-purity argon gas (purity 99.99%, protective atmosphere) into the reaction device, and then raise the temperature to 1450 ° C to achieve the sample. Ignition, sample reaction; keep warm for 0.2~6h, cool to room temperature, stop the protective atmosphere, collect the combustion products, after fine grinding, the fibrous nano-silicon carbide powder can be obtained.

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Abstract

The invention discloses a preparation method of fibrous nano silicon carbide. The preparation method is characterized by comprising the following steps: taking a carbon source and chrysotile asbestos of which the main chemical ingredient is silicon dioxide according to the molar ratio of carbon to silicon dioxide being (0.3-3):1; separately grinding the carbon source and chrysotile asbestos, evenly mixing to obtain a mixture; putting the mixture into a reaction device, vacuumizing, and continuously introducing argon in the reaction device; heating to 1350-2500 DEG C and carrying out thermal reaction for 0.2-6 hours; cooling to room temperature, stopping introduction of argon; collecting the reduction product, and grinding into fine powder which is the fibrous nano silicon carbide powder product. The preparation method has the advantages that raw materials are easily availably and equipment and technology are simple; moreover, the preparation method is friendly to environment and high in productivity. The prepared fibrous nano silicon carbide has good performances, can be widely applied to high-tech equipments such as nose cones of space shuttles, brakes of airplanes and racing bicycles, rocket nozzles, satellite antennas, guided missiles and the like, and also has broad use in nanometer microsystems.

Description

technical field [0001] The invention belongs to the preparation of silicon compounds, and relates to a preparation method of fibrous nano-silicon carbide. The fibrous nano-silicon carbide (SiC) prepared by the present invention has a tensile strength greater than 3000 MPa, a tensile elastic modulus higher than 400 GPa, and has good high temperature oxidation resistance, chemical corrosion resistance, thermal shock resistance and Wear resistance, especially in the ultra-high temperature field of 3000 ℃, it still shows good mechanical properties; it can be widely used in high-tech equipment such as nose cones of space shuttles, brakes of aircraft and racing cars, rocket nozzles, satellite antennas, and missiles , also has a wide range of uses in nano-microsystems. Background technique [0002] Since the discovery of carbon nanotubes by Iijima S in 1991, fibrous one-dimensional nanomaterials have attracted widespread attention. One-dimensional nanomaterials such as nanofibers...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/36B82Y40/00B82Y30/00C01B32/97
Inventor 段涛张红竹文坤刘琨
Owner SOUTHWEAT UNIV OF SCI & TECH
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