Carbon fiber precast body liquid phase soaking and densifying method

A technology of carbon fiber prefabrication and carbon fiber, which is applied in the field of C/C composite material molding technology, can solve the problems of increased processing cycle and reduced material impregnation efficiency, and achieve the effects of shortening the densification cycle, improving impregnation efficiency, and easy operation

Active Publication Date: 2015-03-25
HUBEI SANJIANG AEROSPACE GRP HONGYANG ELECTROMECHANICAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a carbon fiber prefabricated body liquid-phase impregnation densification method, which solves the problem that part of the asphalt in the existing liquid-phase impregnation carbonization densification process is discharged from the prefabricated body, resulting in a decrease in material impregnation efficiency and an increase in the processing cycle.

Method used

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  • Carbon fiber precast body liquid phase soaking and densifying method

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Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1 of the present invention includes an impregnation step, a low-temperature treatment step and a high-temperature carbonization step;

[0023] A, impregnating step: comprise following sub-step:

[0024] A1. In the impregnation container, embed the carbon fiber prefabricated body with pitch impregnating agent, then put the impregnation container into the kettle body of the pressurized impregnation equipment, and cover the kettle body to seal the kettle body;

[0025] A2. Connect the nitrogen pressurization system pipeline to the air inlet of the kettle cover, open the air inlet and air outlet valves, fill the kettle body with nitrogen, and discharge the air in the kettle body;

[0026] A3. Close the air inlet and air outlet valves, remove the nitrogen pressurization system pipes on the air inlets, connect the vacuum system pipes to the air inlets of the kettle cover, open the air inlet valves and vacuum gauge valves, and pump the air into the kettle body. Vac...

Embodiment 2

[0033] Embodiment 2 of the present invention includes an impregnation step, a low-temperature treatment step and a high-temperature carbonization step;

[0034] A, impregnating step: comprise following sub-step:

[0035] A1. In the impregnation container, embed the carbon fiber prefabricated body with pitch impregnating agent, then put the impregnation container into the kettle body of the pressurized impregnation equipment, and cover the kettle body to seal the kettle body;

[0036] A2. Connect the nitrogen pressurization system pipeline to the air inlet of the kettle cover, open the air inlet and air outlet valves, fill the kettle body with nitrogen, and discharge the air in the kettle body;

[0037] A3. Close the air inlet and air outlet valves, remove the nitrogen pressurization system pipes on the air inlets, connect the vacuum system pipes to the air inlets of the kettle cover, open the air inlet valves and vacuum gauge valves, and pump the air into the kettle body. Vac...

Embodiment 3

[0044] Embodiment 3 of the present invention includes an impregnation step, a low-temperature treatment step and a high-temperature carbonization step;

[0045] A, impregnating step: comprise following sub-step:

[0046] A1. In the impregnation container, embed the carbon fiber prefabricated body with pitch impregnating agent, then put the impregnation container into the kettle body of the pressurized impregnation equipment, and cover the kettle body to seal the kettle body;

[0047] A2. Connect the nitrogen pressurization system pipeline to the air inlet of the kettle cover, open the air inlet and air outlet valves, fill the kettle body with nitrogen, and discharge the air in the kettle body;

[0048] A3. Close the air inlet and air outlet valves, remove the nitrogen pressurization system pipes on the air inlets, connect the vacuum system pipes to the air inlets of the kettle cover, open the air inlet valves and vacuum gauge valves, and pump the air into the kettle body. Vacuu...

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Abstract

The invention provides a carbon fiber precast body liquid phase soaking and densifying method and belongs to a C / C composite material molding process which is used for solving the problems of low material soaking efficiency and increased treatment periods caused by part of pitch discharged out from a precast body in an existing liquid phase soaking, carbonizing and densifying process. The method comprises a soaking step, a low-temperature treatment step and a high-temperature carbonizing step. According to the method, the carbon fiber precast body is taken as a reinforcement body, high-temperature modified pitch is taken as a substrate soaking agent, pressurized soaking equipment is adopted for performing C / C material liquid phase soaking and densifying treatment, an existing liquid phase soaking method is adopted, the C / C material density is up to over 1.5g.cm<-3>, and densifying treatment of 8-10 periods is needed; by virtue of the technical process, only 3-4 periods are needed. The pressurized soaking equipment adopted in the method is simple in structure, easy to operation and capable of greatly improving the soaking efficiency, shortening the densifying period and realizing rapid C / C material densification.

Description

Technical field: [0001] The invention belongs to a C / C composite material molding process, and in particular relates to a liquid-phase impregnation densification method for a carbon fiber prefabricated body. Background technique: [0002] C / C material is a pure carbon multiphase structure composite material with carbon fiber and its fabric as the reinforcing phase and carbon or graphite as the matrix phase. It has low density, high strength, low thermal expansion coefficient, high thermal shock resistance, and high temperature burning resistance. It has a series of advantages such as erosion, and has broad application prospects in the field of high temperature and heat protection in aviation and aerospace. The liquid phase impregnation process is a commonly used densification process technology for C / C composite materials. It uses liquid hydrocarbon precursors as impregnants to impregnate and penetrate into the interior of the preform under a certain temperature and pressure...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/83C04B35/622
Inventor 方登科吴华利沈亚东
Owner HUBEI SANJIANG AEROSPACE GRP HONGYANG ELECTROMECHANICAL
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