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Method for reinforcing charcoal/charcoal component by charcoal nano-fibre

A technology of carbon nanofibers and carbon fibers, which is applied in the field of carbon/carbon composite materials to achieve the effects of improved material mechanics, good interface bonding strength, and improved friction and wear properties

Inactive Publication Date: 2009-12-02
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to improve its mechanical properties, on the one hand, high-performance carbon fibers are used, but the source of high-performance carbon fibers has not been well resolved in our country. On the other hand, optimized weaving technology and good composite technology must be adopted. One requirement is still difficult to meet

Method used

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  • Method for reinforcing charcoal/charcoal component by charcoal nano-fibre
  • Method for reinforcing charcoal/charcoal component by charcoal nano-fibre
  • Method for reinforcing charcoal/charcoal component by charcoal nano-fibre

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] 1. Dispersion of carbon nanofibers

[0043] First, dry the carbon cloth in a vacuum atmosphere for 5 hours at a drying temperature of 150°C, dry the carbon nanofibers for 10 hours at a drying temperature of 200°C, and then disperse the carbon nanofibers accounting for 5% of the carbon fiber mass in methanol, Ultrasonic dispersion was used while mechanical stirring was carried out for 10 hours. Spread the carbon cloth in a container filled with methanol and disperse the carbon nanofibers, and place it at room temperature for 10 hours. Due to the volatilization of methanol, the carbon nanofibers are evenly deposited on the surface of the carbon cloth, and the carbon nanofibers are deposited on the carbon surface. The process on the surface of the cloth was repeated three times, and carbon nanofibers with a mass of about 5% of carbon fibers were deposited on the surface of the carbon cloth.

[0044] 2. Preparation of preforms

[0045] Superimpose the carbon cloth contain...

Embodiment 2

[0054] 1. Dispersion of carbon nanofibers

[0055] First, dry the carbon cloth in a vacuum atmosphere for 5 hours at a drying temperature of 150°C, and dry the carbon nanofibers for 10 hours at a drying temperature of 200°C; then, disperse the carbon nanofibers accounting for 10% of the carbon fiber mass in methanol , using ultrasonic dispersion and mechanical stirring for 10 hours at the same time. Spread the carbon cloth in a container filled with methanol and disperse the carbon nanofibers, and place it at room temperature for 10 hours. Due to the volatilization of methanol, the carbon nanofibers are evenly deposited on the surface of the carbon cloth, and the carbon nanofibers are deposited on the carbon surface. The process on the surface of the cloth was repeated three times, and the carbon nanofibers whose mass was about 10% of the carbon fiber were deposited on the surface of the carbon cloth.

[0056] 2. Preparation of preforms

[0057] The carbon cloth containing c...

Embodiment 3

[0065] Embodiment three : The present invention is a new technology of carbon nanofiber reinforced C / C composite material:

[0066] 1. Dispersion of carbon nanofibers

[0067] First, dry the carbon cloth in a vacuum atmosphere for 5 hours at a drying temperature of 150°C, and dry the carbon nanofibers for 10 hours at a drying temperature of 200°C; then, disperse the carbon nanofibers accounting for 15% of the carbon fiber mass in methanol , using ultrasonic dispersion and mechanical stirring for 10 hours at the same time. Spread the carbon cloth in a container filled with methanol and disperse the carbon nanofibers, and place it at room temperature for 10 hours. Due to the volatilization of methanol, the carbon nanofibers are evenly deposited on the surface of the carbon cloth, and the carbon nanofibers are deposited on the carbon surface. The process on the surface of the cloth was repeated three times, and carbon nanofibers with a mass of about 15% of carbon fibers were d...

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Abstract

The invention provides a method for reinforcing carbon / carbon components with carbon nanofibers. The technology includes three parts: (1) preparation of a prefabricated body with carbon nanofibers: first, carbon nanofibers are dispersed in an organic solution, and then It is evenly deposited on the surface of the carbon cloth; secondly, the carbon cloth containing carbon nanofibers is fixed on the graphite fixture; (2) Densification of the preform: the preform is densified by an isothermal chemical vapor deposition process, and the deposition takes 500 to 650 hours , so that its density reaches 1.70-1.75g / cm3; (3) High temperature heat treatment: put the material in a vacuum carbonization furnace, under the protection of nitrogen, argon and other gases, at a heating rate of 30-50°C / h, Raise the temperature to 2000-2300°C and keep it warm for 3-5 hours to get the finished product.

Description

(1) Technical field: [0001] The invention provides a method for reinforcing carbon / carbon components with carbon nanofibers, belonging to the technical field of carbon / carbon composite materials. (two) background technology: [0002] Carbon / carbon (C / C) composites have been successfully used in missile nose cones of strategic nuclear weapons and nozzles of rocket engines due to their good ablation resistance, thermophysical properties, friction and wear properties and high temperature mechanical properties. Aerospace fields such as throat linings and aircraft brake discs. The use of C / C composite materials as structural materials for high temperature and long-term use in the manufacture of aero-engine hot-end components is the research and development direction of advanced countries in the world. None of the developed countries in the world have studied a new generation of high-thrust ratio aero-engines. C / C composites are not considered as high-temperature key materials. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/83C04B35/84
Inventor 罗瑞盈李进松
Owner BEIHANG UNIV