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Preparation method of C/C composite material

A carbon composite material and composite material technology, which is applied in the field of carbon/carbon composite material preparation, can solve the problems of poor bonding between fiber and matrix interface, low utilization rate of raw materials, long preparation period, etc., so as to shorten the preparation period and improve production. Efficiency and raw material utilization, effect of short deposition cycles

Inactive Publication Date: 2015-01-28
INNER MONGOLIA AEROSPACE HONGGANG MACHINERY
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a method for preparing carbon / carbon composite materials, so as to solve the problems of long preparation period, low utilization rate of raw materials, high preparation cost and poor combination of fiber and matrix interface of existing carbon / carbon composite materials. , the problem of poor performance

Method used

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  • Preparation method of C/C composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1) Use 6K carbon fiber with the brand name T300 as the reinforcement of the composite material, and use the three-dimensional four-way weaving method to weave into a block three-dimensional weaving prefabricated body. The carbon fiber density of the prefabricated body is 0.78g / cm 3 . The size of the prefabricated body is 100mm*100mm*100mm.

[0033] 2) Put the preform into a chemical vapor deposition furnace to infiltrate the carbon substrate, the infiltration temperature is 900°C, the furnace pressure is 150Pa, the flow rate of propylene gas is 35ml / min, the flow rate of diluent gas argon is 300ml / min, and the deposition time is 60h. The resulting density is 1.12g / cm 3 preforms and pyrolytic carbon composites.

[0034] 3) Put the low-density prefabricated body and pyrolytic carbon composite obtained in step 2 into the chemical liquid phase gasification infiltration equipment to infiltrate the carbon matrix. The liquid precursor is kerosene, and nitrogen with a flow ra...

Embodiment 2

[0039] 1) Use T700 12K carbon fiber and T700 short carbon fiber mesh tire as the composite material reinforcement, and use the relay-type acupuncture method to make a hollow cylindrical three-dimensional needle-punched felt prefabricated body, and the needle-punched density is 35-40 needles / cm 2 . The prepared preform density is 0.45g / cm 3 . The specifications of the prefabricated body are 200mm in outer diameter, 80mm in inner diameter, and 200mm in height.

[0040] 2) Put the prefabricated body into a chemical vapor deposition furnace to infiltrate the carbon matrix, the infiltration temperature is 950°C, the furnace pressure is 10kPa, the flow rate of propylene gas is 3L / min, the flow rate of diluent gas argon is 5L / min, and the deposition time is 120h. The resulting density is 0.94g / cm 3 preforms and pyrolytic carbon composites.

[0041] 3) Put the low-density prefabricated body and pyrolytic carbon composite obtained in step 2 into the chemical liquid phase gasificati...

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Abstract

The invention relates to a preparation method of a C / C composite material. The C / C composite material is prepared by combining advantages of three processes: a chemical vapor infiltration process, a chemical liquid vapor infiltration process and a resin impregnation and carbonization process. The method comprises the following steps: 1) preparing a preform; 2) preparing a low-density preform and a pyrolytic carbon complex by using the chemical vapor infiltration process; 3) preparing a medium-density C / C composite material by using the chemical liquid vapor infiltration process; 4) carrying out medium high-temperature treatment to improve the porosity so as to facilitate further densification; 5) finally densifying by adopting PIC to obtain a high-density C / C composite material; and 6) carrying out final high-heat treatment to obtain the C / C composite material finished product. The prepared C / C composite material is good in fibrous / interfacial adhesion and excellent in performance, and moreover, the preparation period is greatly shortened, the production efficiency and the utilization ratio of the raw materials are improved, and the production cost is lowered.

Description

technical field [0001] The present invention relates to a kind of preparation method of carbon / carbon (C / C) composite material, exactly is to utilize chemical vapor infiltration (CVI) process, chemical liquid phase gasification infiltration (CLVI) process and liquid phase impregnation carbonization (PIC) A preparation method for preparing low-cost and high-performance carbon / carbon composite materials by process combination. Background technique [0002] C / C composites have excellent mechanical and thermal properties at high temperatures and have been widely used in aviation and aerospace. Such as rocket engine nozzle throat lining, aircraft brake disc, maglev train skid plate, etc. At present, the mainstream process for preparing C / C composite materials is to subject the carbon fiber preform to multiple isothermal CVI processes or multiple liquid phase (resin or pitch) impregnated carbonization (PIC) processes, or a composite method of the above two processes. [0003] Th...

Claims

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Application Information

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IPC IPC(8): C04B35/83C04B35/622
Inventor 严科飞侯仲军拓亚亚李婷赵学平杨林郭晓东
Owner INNER MONGOLIA AEROSPACE HONGGANG MACHINERY
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