Method for preparing hollow silicon carbide nano material

A technology of structural silicon carbide and nanomaterials, applied in the field of synthesizing silicon carbide hollow particles and silicon carbide nanotubes, which can solve the problems of high cost of raw material templates, difficult control of the reaction process, and difficulty in large-scale production

Inactive Publication Date: 2010-08-18
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the process equipment is complex, the cost of raw material templates is high, the reaction process is difficult to control, and it is not easy to achieve large-scale production, so these preparation technologies are subject to certain restrictions in the application process

Method used

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  • Method for preparing hollow silicon carbide nano material
  • Method for preparing hollow silicon carbide nano material
  • Method for preparing hollow silicon carbide nano material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] 1. Weigh 6 grams of phenolic resin, dissolve it in 12 milliliters of absolute ethanol, then add 0.25 grams of ferric nitrate, stir to dissolve it, and dry it at 70°C for 36 hours after the ethanol volatilizes.

[0017] 2. Grind the dried product to obtain a 20-mesh powder, then add it to 13 grams of industrial water glass, form a gel under constant stirring, and dry the obtained gel at 60° C. for 30 hours.

[0018] 3. Put the xerogel into a tube-type high-temperature furnace, raise the temperature to 1200°C under an argon atmosphere, react at a constant temperature for 10 hours, and then cool it down to room temperature naturally.

[0019] 4. The obtained reaction product was oxidized in air at 800°C for 2 hours, then soaked in a mixed acid of hydrochloric acid and hydrofluoric acid with a volume ratio of 1:1.5 for 12 hours, and finally washed, filtered, and dried to obtain silicon carbide hollow nano particles and nanotubes.

Embodiment 2

[0021] 1. Weigh 10 grams of phenolic resin, dissolve it in 25 milliliters of absolute ethanol, then add 2 grams of nickel nitrate, stir to dissolve it, and dry it at 80°C for 24 hours after the ethanol volatilizes.

[0022] 2. Grind the dried product to obtain a 50-mesh powder, then add it into 35 grams of industrial water glass, form a gel under constant stirring, and dry the obtained gel at 70° C. for 24 hours.

[0023] 3. Put the xerogel into a tubular high-temperature furnace, raise the temperature to 1250°C under an argon atmosphere, react at a constant temperature for 8 hours, and then cool it down to room temperature naturally.

[0024] 4. The obtained reaction product was oxidized in air at 600°C for 5 hours, then soaked in a mixed acid of nitric acid and hydrofluoric acid with a volume ratio of 1:2 for 15 hours, and finally washed, filtered and dried to obtain silicon carbide hollow nanometer particles and nanotubes.

Embodiment 3

[0026] 1. Weigh 15 grams of phenolic resin, dissolve it in 55 milliliters of absolute ethanol, then add 9 grams of cobalt nitrate, stir to dissolve it, and dry it at 90°C for 10 hours after the ethanol volatilizes.

[0027] 2. Grind the dried product to obtain 80-mesh powder, then add it into 90 grams of industrial water glass, form a gel under constant stirring, and dry the obtained gel at 80° C. for 24 hours.

[0028] 3. Put the xerogel into a tube-type high-temperature furnace, raise the temperature to 1300°C under an argon atmosphere, react at a constant temperature for 7 hours, and then cool it down to room temperature naturally.

[0029] 4. The obtained reaction product was oxidized in air at 700°C for 3 hours, then soaked in a mixed acid of hydrochloric acid and hydrofluoric acid with a volume ratio of 1:3 for 20 hours, and finally washed, filtered, and dried to obtain silicon carbide hollow nano particles and nanotubes.

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Abstract

The invention relates to a method for preparing hollow silicon carbide nano material. Phenolic resin is dissolved in anhydrous ethanol, nitrate is added and stirred until the nitrate is dissolved, dry product is obtained after the natural volatilization of the ethanol and drying, and is ground into powder, the dry powder is added into sodium silicate, and is constantly stirred to form gel, and the gel is then dried, so that xerogel is obtained; under the argon atmosphere, the xerogel is heated to 1200 DEG C to 1400 DEG C, reacts under the constant temperature for 3 to 20 hours, and is naturally cooled to the room temperature, so that primary reaction product is obtained; the primary reaction product is oxidated in the air, unreacted carbon is removed, and the primary reaction product is then washed by mixed acid, and is finally washed by water, filtered and dried, so that hollow silicon carbide particles and nano tubes are obtained. The invention has the advantages of simple technique, low cost, high product purity and mass production.

Description

technical field [0001] The invention relates to a method for preparing silicon carbide hollow particles and nanotubes, in particular to a method for synthesizing silicon carbide hollow particles and silicon carbide nanotubes through sol-gel and carbothermal reduction techniques. Background technique [0002] Since the discovery of carbon nanotubes in 1991, due to their unique structural characteristics and excellent mechanical, electrical, and optical properties, they have attracted widespread attention from scientists all over the world. Researchers have also continued to explore the synthesis method of this one-dimensional tubular material. and preparation process. In addition to the characteristics of high hardness, oxidation resistance, chemical corrosion resistance and high thermal conductivity, silicon carbide nanomaterials can be widely used in high temperature, high frequency, low energy consumption and high power devices due to their unique optical, electrical and m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/36
Inventor 郭向云郝建英靳国强王英勇
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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