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High performance and low cost C/C-SiC composite brake disc, preparation method and application thereof

A technology of composite materials and brake discs, applied in the direction of brake discs, mechanical equipment, gear transmission mechanisms, etc., can solve problems such as poor heat dissipation, poor wear resistance, thermal cracks, etc., achieve strong interlayer bonding, improve Effect of creep resistance and high thermal conductivity

Active Publication Date: 2017-07-21
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the continuous development of trains in the direction of "high speed" and "heavy load", the brake discs are required to have both high braking energy and light weight, but the existing brake disc materials are wear-resistant Poor performance, fast wear, poor heat dissipation, easy to produce thermal cracks, heavy weight, and high friction noise, so it can't meet the development needs of the train speed that needs to be continuously improved

Method used

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  • High performance and low cost C/C-SiC composite brake disc, preparation method and application thereof
  • High performance and low cost C/C-SiC composite brake disc, preparation method and application thereof

Examples

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preparation example Construction

[0028] The invention provides a method for preparing a composite material brake disc, which is characterized in that it comprises the following steps:

[0029] S1: Carbonize the brake disc prefabricated body, and then use the chemical vapor deposition method to densify the carbonized brake disc prefabricated body to obtain a C / C composite material; wherein, the brake disc prefabricated body is made of polyacrylonitrile-based prefabricated Oxygen silk fibers are formed by three-dimensional needle punching; the carbonization temperature is 1000-1400°C, the time is 45-75h, and the carbonization is carried out under vacuum conditions; the chemical vapor deposition method is specifically: one of propane, natural gas and propylene or several kinds of carbon source gas, nitrogen and / or hydrogen as dilution gas, infiltration temperature is 900-1200°C, infiltration pressure is 1000-5000Pa, and infiltration time is 50-200h; among them, carbon source gas and dilution gas The volume ratio...

Embodiment 1

[0036] The single-layer 0° no-weft cloth, tire net, 90° no-weft cloth, and tire net are superimposed in sequence, and then the polyacrylonitrile (PAN)-based pre-oxidized silk fiber is introduced in the direction perpendicular to the lay-up direction by the relay-type needling method. , to make a brake disc prefabricated body; under vacuum conditions, the brake disc prefabricated body was carbonized at a temperature of 1200 ° C for 60 hours; and then the carbonized brake disc prefabricated body was Densification, using propane as the carbon source gas, nitrogen as the diluent gas, the volume ratio of propane to nitrogen is 1:2, the infiltration temperature is 1150°C, the infiltration pressure is 3000Pa, the infiltration time is 120h, and the obtained density is 1.3g / cm 3 C / C composite materials.

[0037] Under the protection of argon, the C / C composite material is subjected to high-temperature heat treatment at 2200 ° C for 2 hours; then it is machined, and according to the p...

Embodiment 2

[0041] The single-layer 0° no-weft cloth, tire net, 90° no-weft cloth, and tire net are superimposed in sequence, and then the polyacrylonitrile (PAN)-based pre-oxidized silk fiber is introduced in the direction perpendicular to the lay-up direction by the relay-type needling method. , to make a brake disc prefabricated body; under vacuum conditions, the brake disc prefabricated body was carbonized at a temperature of 1200 ° C for 60 hours; and then the carbonized brake disc prefabricated body was Densification, using propane as the carbon source gas, nitrogen as the diluent gas, the volume ratio of propane to nitrogen is 1:2, the infiltration temperature is 1150°C, the infiltration pressure is 3000Pa, the infiltration time is 120h, and the obtained density is 1.3g / cm 3 C / C composite materials.

[0042] Under the protection of argon, the C / C composite material is subjected to high-temperature heat treatment at 2200 ° C for 2 hours; then it is machined, and according to the p...

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Abstract

The invention relates to a high performance and low cost C / C-SiC composite brake disc, a preparation method and application thereof. The preparation method includes: carbonizing a brake disc prefab, and densifying the carbonized brake disc prefab by chemical vapor infiltration method to obtain a C / C composite material; then performing heat treatment in an inert atmosphere to improve the graphitization degree of the composite material; then conducting machining to obtain a C / C composite blank; treating the C / C composite blank by molten silicon infiltration method to obtain a C / C-SiC composite brake disc; then treating the C / C-SiC composite brake disc by means of chemical vapor infiltration or precursor infiltration pyrolysis; and machining the obtained product into a final design size, thus obtaining a composite brake disc finished product. The C / C-SiC composite brake disc and the preparation method thereof provided by the invention can reduce the preparation cost and improve the mechanical performance, thermal conductivity and friction and wear performance of the brake disc.

Description

technical field [0001] The invention relates to the technical field of composite material preparation, in particular to a high-performance and low-cost C / C-SiC composite brake disc and its preparation method and application. Background technique [0002] High-speed railway (hereinafter referred to as "high-speed railway") is the trend of the world's rail transit development. At present, the mileage of my country's high-speed railway has reached 10,000 kilometers, and the high-speed railway under construction is more than 10,000 kilometers. It is estimated that by 2021, the total mileage of China's high-speed railway will exceed 30,000 kilometers, ranking first in the world. With the rapid development of high-speed rail, its safety has also attracted much attention, among which braking technology is crucial to the safe operation of trains. At present, the braking methods used by high-speed rail mainly include electric braking and air braking, and there are also braking method...

Claims

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Application Information

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IPC IPC(8): C04B35/83C04B35/565C04B35/65C04B41/84C04B41/85F16D65/12
CPCC04B35/573C04B35/65C04B35/83C04B41/4983C04B41/5096C04B41/84C04B41/85C04B2235/5212C04B2235/77F16D65/12F16D2200/0034C04B41/46C04B41/4535C04B41/4529C04B41/4517
Inventor 罗瑞盈罗浩
Owner BEIHANG UNIV
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