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Chemical vapor infiltration method for preparing pyrolytic carbon with external biomass catalyst

A chemical vapor infiltration and catalyst technology, which is applied in the field of ultra-high temperature structural material preparation, can solve problems affecting pyrolytic carbon deposition, changing the size and distribution of internal pores of preforms, and affecting deposition rates, etc.

Active Publication Date: 2021-06-08
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Document 1 "Ni-Catalyzed carbon infiltration of carbon-fiber substrates, P.McAllister, E.E.Wolf.Carbon, 1992, 30(2): 189-200" confirmed that the CCVI process will catalyze the growth of one-dimensional carbon materials inside the carbon fiber preform. Dimensional carbon materials can cause pore blockage and affect deposition rates
Document 2 "Densification kinetics and matrix microstructure of carbonfiber / carbon nanofiber / pyrocarbon composites prepared by electrophoresis and thermal gradient chemical vapor infiltration, Jinsong Li, Ruiying Luo, YingYan. Carbon, 2010, 49 (1)" pointed out that carbon nanofibers were introduced into carbon fiber prefabrication The inside of the body will change the size and distribution of the internal pores of the preform, thereby affecting the deposition of pyrolytic carbon
Therefore, the CCVI process can improve the deposition efficiency, but there is a problem of catalytically growing one-dimensional carbon materials to block the deposition channel.

Method used

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  • Chemical vapor infiltration method for preparing pyrolytic carbon with external biomass catalyst
  • Chemical vapor infiltration method for preparing pyrolytic carbon with external biomass catalyst
  • Chemical vapor infiltration method for preparing pyrolytic carbon with external biomass catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Preparation of biomass catalyst

[0031] ① The logs are cut and polished into wood chips, put into an ultrasonic cleaner and cleaned with deionized water and absolute ethanol in sequence, and after cleaning, put them into a constant temperature drying oven to dry.

[0032] ②Impregnation: Soak the dried wood chips in 0.05mol / L nickel nitrate solution for a period of time, after impregnation, put them in a constant temperature drying oven for drying.

[0033] ③ Carbonization: Place the dried wood chips in a low-temperature heat treatment furnace for carbonization. Vacuumize the furnace body, inject argon gas, adjust to normal pressure, repeat several times, so that the air in the furnace body is exhausted; turn on the heating switch, under the protection of argon gas, heat up for 3 hours, so that the temperature reaches 900 ° C, the argon gas The flow rate is 1500ml / min; when the temperature reaches 900°C, adjust the flow rate of argon gas to 1600ml / min and keep warm...

Embodiment 2

[0038] (1) Preparation of biomass catalyst

[0039] ① The logs are cut and polished into wood chips, put into an ultrasonic cleaner and cleaned with deionized water and absolute ethanol in sequence, and after cleaning, put them into a constant temperature drying oven to dry.

[0040] ②Impregnation: Soak the dried wood chips in 0.10mol / L nickel nitrate solution for a period of time, after impregnation, put them into a constant temperature drying oven to dry for later use.

[0041]③ Carbonization: Place the dried wood chips in a low-temperature heat treatment furnace for carbonization. Vacuumize the furnace body, inject argon gas, adjust to normal pressure, repeat several times, so that the air in the furnace body is exhausted; turn on the heating switch, under the protection of argon gas, heat up for 3 hours, so that the temperature reaches 900 ° C, the argon gas The flow rate is 1500ml / min; when the temperature reaches 900°C, adjust the flow rate of argon gas to 1600ml / min an...

Embodiment 3

[0046] (1) Preparation of biomass catalyst

[0047] ① The logs are cut and polished into wood chips, put into an ultrasonic cleaner and cleaned with deionized water and absolute ethanol in sequence, and after cleaning, put them into a constant temperature drying oven to dry.

[0048] ②Impregnation: Soak the dried wood chips in 0.15mol / L nickel nitrate solution for a period of time, after impregnation, put them into a constant temperature drying oven for drying.

[0049] ③ Carbonization: Place the dried wood chips in a low-temperature heat treatment furnace for carbonization. Vacuumize the furnace body, inject argon gas, adjust to normal pressure, repeat several times, so that the air in the furnace body is exhausted; turn on the heating switch, under the protection of argon gas, heat up for 3 hours, so that the temperature reaches 900 ° C, the argon gas The flow rate is 1500ml / min; when the temperature reaches 900°C, adjust the flow rate of argon gas to 1600ml / min and keep wa...

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Abstract

The invention relates to a chemical vapor infiltration method for preparing pyrolytic carbon with an external biomass catalyst. The biomass catalyst is introduced outside a carbon fiber preform, decomposition and reutilization of deposited gas are catalyzed, the decomposition, polymerization and addition polymerization process of the deposited gas is accelerated, the concentration of a gas decomposition product in unit time is improved, and the initial deposition efficiency of pyrolytic carbon is improved by about 4 times compared with that without catalysis. The one-dimensional carbon material is generated in the external catalyst, so that the smoothness of a pyrolytic carbon deposition channel is ensured. The gas components in the deposition space are changed, and the graphitization degree of the matrix carbon of the catalytic C / C composite material is increased by about 40%. The preparation method is simple to operate, the catalyst is low in cost and expected to be recycled, and good social benefits and economic benefits are achieved.

Description

technical field [0001] The invention belongs to the field of preparation of ultra-high temperature structural materials, and relates to a chemical vapor phase infiltration method for preparing pyrolytic carbon with an external biomass catalyst, which is mainly used for the preparation of C / C composite materials. The invention realizes catalytic decomposition and reuse of carbon source gas by introducing biomass catalyst, and improves pyrolytic carbon deposition efficiency. Background technique [0002] C / C composite material refers to a pure carbon multiphase structure composed of carbon fiber or its fabric as the reinforcing phase, and chemical vapor infiltration pyrolytic carbon or liquid phase impregnation-carbonized resin carbon and pitch carbon as the matrix. C / C composite materials have the characteristics of both carbon materials and fiber reinforced materials, and have irreplaceable advantages in many high-tech fields such as aerospace, national defense and military....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/83C04B35/52C04B35/622
CPCC04B35/83C04B35/52C04B35/622
Inventor 史小红韩璐璐韩旭田新发杨莉母杰瑞焦凡王国庆
Owner NORTHWESTERN POLYTECHNICAL UNIV