Batch method for rapid preparation of high-density carbon/carbon composites

A carbon composite material and high-density technology, which is applied in the field of rapid preparation of high-density carbon/carbon composite materials in batches, can solve the problems of not being able to achieve rapid densification, mass production, and difficult industrial production, and achieve intelligent process operation control The effects of chemicalization, short preparation cycle and stable quality

Active Publication Date: 2018-04-17
JIANGXI JIAJIEXINDA NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] According to the search, there are problems such as complex process, high cost, incapable of mass production, unstable quality, etc.
For example, the domestic patent No. 200910093946.6 is a high-performance carbon-based composite material rapid directional infiltration airflow control method. The graphite tooling design can only adapt to the ring-shaped prefabricated body, and the directional infiltration cannot be performed on the plate-shaped or special-shaped prefabricated body. If the gas pressure, temperature and gas flow are not controlled in stages, the effect of rapid densification cannot be achieved
For example, the domestic patent No. 200410026035.9 prepares thick-walled carbon / carbon composite materials by thermal gradient chemical vapor deposition. The method described in this patent can indeed rapidly prepare high-density carbon / carbon composite materials, but the structure of the general product is not Certain differences require special fixtures, which are only suitable for single-piece production and are difficult to industrialize

Method used

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  • Batch method for rapid preparation of high-density carbon/carbon composites

Examples

Experimental program
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Effect test

example 1

[0022] An intermediate frequency power supply chemical vapor deposition furnace is used (the diameter of the furnace cavity is 650MM and the height is 1600MM). The size of 12 preforms is 4001mm×400mm×30mm. The outer diameter of 12 graphite ring pads is 600mm and the height is 80mm. 12 pieces of porous The outer diameter of the graphite disc is 600 mm, the thickness is 30 mm, and 100 through holes with a diameter of 15 mm are evenly distributed on the disc. The steps are as follows:

[0023] (1) Put the prefabricated body and fixtures into the deposition furnace, close the furnace cover, evacuate the furnace to a pressure of <10Pa, start the heating program, and raise the temperature to 800-1100°C; open the gas valve, and let natural gas and nitrogen pass through After the gas tank is mixed evenly, it enters the deposition furnace.

[0024] (2) Enter the temperature control program, gas flow control program and air pressure control program for staged operation: the preheating ...

example 2

[0027] The chemical vapor deposition furnace with intermediate frequency power supply is used (the diameter of the furnace chamber is 650MM, and the height is 1600MM). The size of 12 preforms is 400mm×400mm×20mm, and the outer diameter of 12 graphite ring pads is 600mm. The height is 80mm, and 12 pieces are porous The outer diameter of the graphite disc is 600 mm, the thickness is 30 mm, and 100 through holes with a diameter of 15 mm are evenly distributed on the disc. The steps are as follows:

[0028] (1) Put the prefabricated body and fixtures into the deposition furnace, close the furnace cover, evacuate the furnace to a pressure of <10Pa, start the heating program, and raise the temperature to 800-1100°C; open the gas valve, and let natural gas and nitrogen pass through After the gas tank is mixed evenly, it enters the deposition furnace.

[0029] (2) Enter the temperature control program, gas flow control program and air pressure control program for staged operation: th...

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Abstract

The invention relates to a method for rapidly preparing a high-density carbon / carbon composite material in batches. The method comprises the following steps: through transformation of the interior of a furnace chamber, putting a preform into a furnace, and introducing a pyrolysis-gas natural gas and a dilute gas nitrogen into a gas tank after proportioning; feeding a mixture into a depositing furnace after mixing evenly; evenly heating the mixed gas through preheating and diffusing of a preheating region, so that the natural gas reaches the critical cracking temperature; and carrying out periodical operation through an input temperature control procedure, a gas flow control procedure and an air pressure control procedure, so that the deposition efficiency of the gas is high. The method can be applied to industrial production; the preparation process is simple; operation and control of the process are intelligentized; and the product has the advantages of short preparation cycle, high density, stable quality and high qualification rate.

Description

technical field [0001] The invention relates to the technical field of carbon-carbon composite materials, in particular to a method for rapidly preparing high-density carbon / carbon composite materials in batches. Background technique [0002] Carbon / carbon composite material is a composite material of carbon fiber reinforced carbon matrix. It has high specific strength and specific modulus in high temperature environment, as well as good ablation resistance, thermophysical, friction and wear properties and high temperature mechanical properties. It is the only one so far. Can meet these stringent requirements and the most promising high-tech new materials. It has been successfully used in military and aerospace fields such as missile nose cones, rocket engine nozzle throat liners, space shuttle nose cones and wing leading edges, and aircraft brake discs, as well as civilian and medical fields such as chemical industry, metallurgy, automobiles, and nuclear energy. However, d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/83
Inventor 李建春张文杰万汉林
Owner JIANGXI JIAJIEXINDA NEW MATERIAL TECH CO LTD
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