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Surface treatment method of fiber for carbon brake disc

A surface treatment, carbon brake disc technology, applied in the manufacture of aircraft carbon brake discs, can solve the problems of poor fiber surface modification applicability, difficulty in forming an effective interface of carbon/carbon composite materials, and low service life of carbon discs, etc. The effect of interface bond strength, improvement of matrix growth mode, and extended service life

Active Publication Date: 2013-06-26
XIAN AVIATION BRAKE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the disadvantages of poor applicability to fiber surface modification and difficulty in forming an effective interface of carbon / carbon composite materials in the prior art, resulting in the low service life of carbon discs under normal use conditions, the present invention proposes a fiber for carbon brake discs surface treatment method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] This embodiment is a method for surface treatment of fibers for carbon brake discs, and its specific process includes the following steps:

[0016] Step 1, modifying the fiber surface. The 30-layer carbon fiber preforms processed by conventional methods were loaded into the isothermal vapor deposition furnace, and graphite gasket rings were installed between the carbon fiber preforms of each layer to form a deposition gas channel between the carbon fiber preforms of each layer. The volume content of fibers in the carbon fiber preform is 20%. Adjust the deposition furnace temperature to 800 °C. Feed propylene gas, the flow rate of the propylene gas is 1.8m 3 / h, adjust the atmospheric pressure to not more than 12.0kPa, after 10 hours of deposition, complete the CVD modification treatment of the preform, increase the weight percentage of the carbon fiber preform by 0.7%, and obtain the modified carbon fiber preform.

[0017] Step 2, depositing the modified carbon fiber...

Embodiment 2

[0023] This embodiment is a method for surface treatment of fibers for carbon brake discs, and its specific process includes the following steps:

[0024] Step 1, modifying the fiber surface. The 40 layers of carbon fiber preforms processed by conventional methods were loaded into the isothermal vapor deposition furnace, and graphite gasket rings were installed between the carbon fiber preforms of each layer to form a deposition gas channel between the carbon fiber preforms of each layer. The volume content of fibers in the carbon fiber preform is 30%. Adjust the deposition furnace temperature to 900 °C. Feed propylene gas, the flow rate of the propylene gas is 2.2m 3 / h, adjust the atmospheric pressure to ≤12.0kPa, after 5 hours of deposition, complete the CVD surface treatment of the preform, increase the weight percentage of the carbon fiber preform by 0.6%, and obtain the modified carbon fiber preform.

[0025] Step 2, depositing the modified carbon fiber preform. The ...

Embodiment 3

[0031] This embodiment is a method for surface treatment of fibers for carbon brake discs, and its specific process includes the following steps:

[0032] Step 1, modifying the fiber surface. The 50 layers of carbon fiber preforms processed by conventional methods were loaded into an isothermal vapor deposition furnace, and graphite gasket rings were installed between each layer of carbon fiber preforms to form a deposition gas channel between each layer of carbon fiber preforms. The volume content of fibers in the carbon fiber preform is 35%. Adjust the deposition furnace temperature to 940 °C. Feed propylene gas, the flow rate of the propylene gas is 3.6m 3 / h, adjust the atmospheric pressure to ≤12.0kPa, and complete the CVD surface treatment of the preform after 0.5h of deposition, so that the weight percentage of the carbon fiber preform is increased by 0.3%, and a modified carbon fiber preform is obtained.

[0033] Step 2, depositing the modified carbon fiber preform....

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Abstract

The invention discloses a surface treatment method of fiber for a carbon brake disc. The fiber is subjected to surface modification, and the sectional deposition is combined with the heat treatment, and then the low-wear-rate aircraft carbon brake disc modified by a chemical vapor deposition method is obtained. By adopting the technical scheme of the invention, a pyrolytic carbon interfacial layer different from a deposition pyrolytic carbon matrix is added and increases the interfacial effect; the interfacial deposition efficiency is improved by the pyrolytic carbon interface, the deposition temperature and the subsequent deposition or thermal treatment temperature are set according to the kind of the selected gas, the deposition period of the carbon brake disc is shortened, and the final density of the obtained carbon brake disc is up to more than 1.72g / cm<3>. The carbon fiber surface treatment method mitigates the defect of an isothermal vapor phase chemical vapor deposition method that the attenuation of the density increase rate is too fast along with the deposition time; and moreover, the interface bonding strength and the growth mode of the matrix are improved, and the service life of the brake disc is prolonged.

Description

technical field [0001] The invention relates to a method for manufacturing an aircraft carbon brake disc, in particular to a method for manufacturing an aircraft brake disc by modifying a carbon fiber prefabricated body through a chemical vapor deposition method and improving the interfacial effect of composite treatment. Background technique [0002] Carbon / carbon composite materials have small specific gravity, large specific heat, good high-temperature mechanical properties, and excellent friction properties. They are especially suitable for aircraft brake materials, that is, carbon / carbon composite brake discs, referred to as carbon discs. The French Messier company and the American goodrich company use the Novoltex 3D fine-woven body as the fiber preform, and directly conduct chemical vapor deposition to form pyrolytic carbon. The British Dunlop company mostly uses pre-oxidized wire as the preform to deposit pyrolytic carbon. At present, almost all domestic carbon Brake...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/83
Inventor 王小宪张晓伟卢刚认刘海平施伟伟
Owner XIAN AVIATION BRAKE TECH
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