Preparation method of carbon brake disk

A technology of carbon brake discs and brake discs, which is applied in the manufacturing field of aircraft carbon brake discs, can solve the problems of poor shear resistance of asperities on the friction surface, difficult carbon/carbon composite material effective interface, poor applicability of fiber surface modification, etc. problem, achieve the effect of enhancing the interface effect, saving the preparation cost and improving the shear force

Active Publication Date: 2012-08-22
XIAN AVIATION BRAKE TECH
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Problems solved by technology

[0004] In order to overcome the shortcomings of the existing technology, such as poor applicability to fiber surface modification, difficulty in forming an effective interface of carbon / carbon composite materials, and poor shear resistance of asperities on the friction surface, resulting in the result of low service life of carbon brake discs under low-speed and low-energy conditions , the present invention proposes a method for preparing a carbon brake disc

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] This embodiment is a method for preparing a carbon brake disc, and its specific process includes the following steps:

[0017] Step 1, modifying the fiber surface. Put 30 layers of carbon fiber preforms into an isothermal vapor deposition furnace, and install graphite gasket rings between each layer of carbon fiber preforms to form a channel for deposition gas between each layer of carbon fiber preforms. 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 10h of deposition, complete the CVD surface modification treatment of the preform, increase the weight percentage of the carbon fiber preform by 0.7%, and obtain the modified carbon fiber preform.

[0018] Step 2, performing heat treatment on the modified carbon fiber preform. The modified carbon fiber preform is heat t...

Embodiment 2

[0025] This embodiment is a method for preparing a carbon brake disc, and its specific process includes the following steps:

[0026] Step 1, modifying the fiber surface. Put 40 layers of carbon fiber preforms into an isothermal vapor deposition furnace, and install graphite gasket rings between each layer of carbon fiber preforms to form a channel for deposition gas between each layer of carbon fiber preforms. 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 modification treatment of the preform, increase the weight percentage of the carbon fiber preform by 0.6%, and obtain the modified carbon fiber preform.

[0027] Step 2, performing heat treatment on the modified carbon fiber preform. The modified carbon fiber preform is heat treated in...

Embodiment 3

[0034] This embodiment is a method for preparing a carbon brake disc, and its specific process includes the following steps:

[0035] Step 1, modifying the fiber surface. Put 50 layers of carbon fiber preforms into an isothermal vapor deposition furnace, and install graphite gasket rings between each layer of carbon fiber preforms to form a channel for deposition gas 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, after 0.5h of deposition, complete the CVD surface modification treatment of the preform, increase the weight percentage of the carbon fiber preform by 0.3%, and obtain the modified carbon fiber preform.

[0036] Step 2, performing heat treatment on the modified carbon fiber preform. The modified carbon fiber preform is heat treated in a ...

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Abstract

The invention discloses a preparation method of a carbon brake disk. The invention combines heat treatment and chemical vapor deposition fiber surface treatment to obtain the improved carbon fiber preform. The fiber surface CVD modification and secondary heat treatment process reinforces the fiber modification result, increases the base nucleation points on the fiber surface, enhances the interfacial effect of carbon/carbon composite treatment, and increases the shear resistance force of bulges on the friction surface; and meanwhile, the deposition efficiency of the carbon disk is enhanced, the deposition period of the carbon brake disk is shortened from 800-1200 hours to 450-600 hours, and the preparation cost is saved. The technical scheme adopted by the invention can enhance the interfacial bonding strength and the interfacial effect, improve the base growth pattern and prolong the service life of the carbon brake disk under low-speed low-energy conditions.

Description

technical field [0001] The invention relates to the field of manufacturing an aircraft carbon brake disc, in particular to a preparation method of a carbon brake disc. 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 disc manufacturers use quasi-three-dimensional integral needle-punched felt as the prefabricated body, and the substrate uses pyrolytic carbon, resin carbo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/83C04B35/622F16D65/12
Inventor 王小宪张晓伟卢刚认刘海平周蕊
Owner XIAN AVIATION BRAKE TECH
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