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Novel carbon/carbon composite material brake disc densification method

A carbon composite material and brake disc technology, which is applied in the densification field of new carbon/carbon composite brake discs, can solve the problems of high production cost, slow density growth, and long chemical vapor infiltration cycle, so as to improve utilization rate, The effect of improving density uniformity and improving densification efficiency

Active Publication Date: 2022-03-29
XIAN AVIATION BRAKE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problems of long chemical vapor infiltration cycle, slow density growth and high production cost of the current carbon / carbon composite brake disc, the present invention optimizes and improves the existing technology, and proposes a new carbon / carbon composite The material brake disc densification method not only improves the densification efficiency of the product, shortens the deposition time, and reduces the production cost, but also improves the density uniformity of the carbon / carbon composite brake disc, which helps to extend the brake disc service life

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] This embodiment is a novel carbon / carbon composite material brake disc densification method, and the specific steps are as follows:

[0037] Step 1: Pre-CVI densification

[0038] Step 11: Load the prefab into the furnace. Stack the circular prefabricated body on the bottom plate of the deposition furnace as required, so that the air inlet on the bottom plate of the deposition furnace is located in the center of the prefabricated body material column, and a graphite cover plate with a certain weight is placed on the top of the prefabricated body material column. Next, block the gas path inside the material column, so that the gas forms a pressure difference along the radial direction of the circular prefabricated body.

[0039] Step 12: Vacuum. After the furnace is installed, vacuumize the furnace body. When the vacuum degree is 0.3Kpa, stop the pump and close the valve of the exhaust pipe.

[0040] Step 13: Heat up the temperature. Start the power supply to heat up...

Embodiment 2

[0056] This embodiment is a novel carbon / carbon composite material brake disc densification method, and the specific steps are as follows:

[0057] Step 1: Pre-CVI densification

[0058] Step 11: Load the prefab into the furnace. Stack the circular prefabricated body on the bottom plate of the deposition furnace as required, so that the air inlet on the bottom plate of the deposition furnace is located in the center of the prefabricated body material column, and a graphite cover plate with a certain weight is placed on the top of the prefabricated body material column. Next, block the gas path inside the material column, so that the gas forms a pressure difference along the radial direction of the circular prefabricated body.

[0059] Step 12: Vacuum. After the furnace is installed, vacuumize the furnace body. When the vacuum degree is 0.28Kpa, stop the pump and close the valve of the exhaust pipe.

[0060] Step 13: Heat up the temperature. Start the power supply to heat u...

Embodiment 3

[0076] This embodiment is a novel carbon / carbon composite material brake disc densification method, and the specific steps are as follows:

[0077] Step 1: Pre-CVI densification

[0078] Step 11: Load the prefab into the furnace. Stack the circular prefabricated body on the bottom plate of the deposition furnace as required, so that the air inlet on the bottom plate of the deposition furnace is located in the center of the prefabricated body material column, and a graphite cover plate with a certain weight is placed on the top of the prefabricated body material column. Next, block the gas path inside the material column, so that the gas forms a pressure difference along the radial direction of the circular prefabricated body.

[0079] Step 12: Vacuum. After the furnace is installed, vacuumize the furnace body. When the vacuum degree is 0.3Kpa, stop the pump and close the valve of the exhaust pipe.

[0080] Step 13: Heat up the temperature. Start the power supply to heat up...

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Abstract

The invention relates to a novel densification method for a carbon / carbon composite material brake disc, and relates to the field of preparation of carbon / carbon composite material brake discs. Comprising the five steps of CVI early-stage densification, rough machining, CVI later-stage densification, high-temperature heat treatment and final finish machining, in the CVI early-stage densification and the CVI later-stage densification, at the target temperature, cyclic vacuumizing-air inlet pressure maintaining operation is adopted to replace simultaneous air inlet and exhaust operation in the conventional brake disc production process, so that a remarkable pressure difference is formed in the radial direction of the brake disc, and the brake disc is subjected to rough machining, rough machining, CVI later-stage densification, high-temperature heat treatment and final finish machining. The carbon source gas in the hearth can be fully cracked, the utilization rate of the carbon source gas is increased, the waste of the carbon source gas is reduced to the maximum extent, and the preparation cost of the carbon / carbon composite material brake disc is saved.

Description

technical field [0001] The invention relates to the field of carbon / carbon composite material brake disc preparation, in particular to a novel carbon / carbon composite material brake disc densification method. Background technique [0002] Carbon / carbon composite material is a carbon-based composite material reinforced by carbon fiber and its fabric. It has a series of advantages such as high specific strength, high specific heat capacity, excellent thermal conductivity, low expansion coefficient, stable friction and wear performance, and low density. It is widely used in aerospace field. Compared with traditional steel brake discs, carbon / carbon composite brake discs are light in weight, high in load capacity, and good in thermal shock resistance. They can work at high temperatures and are not prone to deformation, falling off, and bonding, and have a long service life. Good maintainability, so it has become the material of choice for aircraft brake discs. [0003] The mai...

Claims

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Application Information

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IPC IPC(8): C04B35/83C04B35/622
CPCC04B35/83C04B35/622C04B2235/614C04B2235/656C04B2235/6567
Inventor 韩文静商海东张艳萍薛亮李娜王岩
Owner XIAN AVIATION BRAKE TECH
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