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Method for preparing pyrolytic carbon by using acetaldehyde precursor

A technology for pyrolysis of carbon and precursors, which is applied in the preparation/purification of carbon, etc., to achieve the effects of convenient operation, simple and reasonable preparation method, and wide process conditions

Active Publication Date: 2021-04-16
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are no reports or patents mentioning the use of acetaldehyde as a precursor to prepare pyrolytic carbon

Method used

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  • Method for preparing pyrolytic carbon by using acetaldehyde precursor
  • Method for preparing pyrolytic carbon by using acetaldehyde precursor
  • Method for preparing pyrolytic carbon by using acetaldehyde precursor

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Step 1: A quartz glass sheet with a size of 10×10×2 mm is used as a substrate, and an acetaldehyde organic solution (purity is 40%) is used as a precursor. Nitrogen (N2, 99.99% by volume) was used as the carrier gas and diluent gas.

[0025] Step 2: Pour 4 bottles of acetaldehyde organic solution into a closed metal container, and make the acetaldehyde organic solution turn into steam to participate in the reaction by bubbling.

[0026] Step 3: Using the isothermal chemical vapor infiltration method, place the quartz glass substrate in step 1 in a deposition reactor, and let the gas pass through the quartz glass substrate in parallel from the bottom to the top. Then the temperature was raised from room temperature to 1050°C at a rate of 8°C / min. Control the acetaldehyde gas flow in the flowmeter at 80 sccm, deposit at 1050°C for 5 hours, then gradually lower the temperature from 1050°C to 200°C, turn off the power, and take out the sample after natural cooling. The wh...

Embodiment 2

[0028] Step 1: Use a density of 0.47g / cm 3 The 2D carbon felt (50 × 25 × 10 mm in size) was used as the substrate, and the organic solution of acetaldehyde (40% purity) was used as the precursor. Nitrogen (N2, 99.99% by volume) was used as the carrier gas and diluent gas.

[0029] Step 2: Pour 5 bottles of acetaldehyde organic solution into a closed metal container, and make the acetaldehyde organic solution turn into steam to participate in the reaction by bubbling.

[0030] Step 3: Using the isothermal chemical vapor infiltration method, place the carbon felt substrate in step 1 in the deposition reactor, and let the gas pass through the carbon felt substrate in parallel from bottom to top. Then the temperature was raised from room temperature to 1090° C. at a rate of 10° C. / min. Control the acetaldehyde gas flow in the flowmeter to 100 sccm, deposit at 1090°C for 15 hours, then gradually lower the temperature from 1090°C to 200°C, turn off the power, and take out the samp...

Embodiment 3

[0032] Step 1: Use a density of 0.6g / cm 3 The 2D carbon felt (50 × 25 × 10 mm in size) was used as the substrate, and the organic solution of acetaldehyde (40% purity) was used as the precursor. Nitrogen (N2, 99.99% by volume) was used as the carrier gas and diluent gas.

[0033] Step 2: Pour 5 bottles of acetaldehyde organic solution into a closed metal container, and make the acetaldehyde organic solution turn into steam to participate in the reaction by bubbling.

[0034] Step 3: Using the isothermal chemical vapor infiltration method, place the carbon felt substrate in step 1 in the deposition reactor, and let the gas pass through the carbon felt substrate in parallel from bottom to top. Then the temperature was raised from room temperature to 1120°C at a rate of 12°C / min. Control the acetaldehyde gas flow in the flowmeter at 110 sccm, deposit at 1120°C for 20 hours, then gradually lower the temperature from 1120°C to 200°C, turn off the power, and take out the sample af...

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Abstract

The invention relates to a method for preparing pyrolytic carbon by using an acetaldehyde precursor, which is characterized in that in a chemical vapor infiltration process, an acetaldehyde organic solution is used as a precursor, and nitrogen is used as carrier gas and diluent gas. The acetaldehyde organic solution is poured into a closed metal container, and the acetaldehyde organic solution is changed into steam to participate in the reaction through a bubbling method. According to the method, the pyrolytic carbon with a good structure is prepared by taking acetaldehyde as a precursor for the first time by utilizing a chemical vapor deposition process technology. The preparation method is simple and reasonable, wide in process conditions and convenient to operate. Meanwhile, the selection of a pyrolytic carbon raw material preparation system is broadened, and a new thought is provided for structural optimization of pyrolytic carbon.

Description

technical field [0001] The invention belongs to a method for preparing pyrolytic carbon, and relates to a method for preparing pyrolytic carbon with an acetaldehyde precursor, in particular to a method for preparing a pyrolytic carbon film, a pyrolytic carbon matrix, and a pyrolytic carbon interface using acetaldehyde as a precursor Methods. Background technique [0002] Carbon materials have been successfully used in aviation, aerospace, military and civil fields. Among them, carbon / carbon composite materials are widely used in nozzles and throats of rocket engines due to their superior high temperature properties, such as high specific strength, high specific modulus, high thermal conductivity, good wear resistance and excellent thermal shock resistance. Linings and aircraft brake discs, etc. Carbon / carbon (C / C) composites consist of carbon fibers and pyrolytic carbon, and the method widely used to prepare pyrolytic carbon is chemical vapor infiltration (CVI). In recent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05
Inventor 李贺军汪体园张守阳任碧云李伟彭景雅李棚辉
Owner NORTHWESTERN POLYTECHNICAL UNIV
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