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A rapid and low-cost CVD densification method for carbon/carbon composites

A carbon composite material, low-cost technology, applied in the direction of metal material coating process, coating, gaseous chemical plating, etc., can solve the problems of poor product quality consistency, high energy consumption, etc., to reduce process production costs and high compaction efficiency , Guarantee the effect of product quality

Inactive Publication Date: 2020-01-14
AEROSPACE RUITIAN CARBON MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art and provide a fast and low-cost CVD densification method for carbon / carbon composite materials, which not only has high-efficiency and fast CVD densification efficiency, but also solves the poor consistency of product quality in the original rapid process And the problem of high energy consumption; this method integrates the advantages of deposition processes such as gas-limiting method, temperature difference method and self-heating, greatly improves the compactness efficiency of the product, and uses the carbon / carbon composite material product quality consistency prepared by the present invention Well, the production cost of the product has dropped significantly

Method used

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  • A rapid and low-cost CVD densification method for carbon/carbon composites
  • A rapid and low-cost CVD densification method for carbon/carbon composites
  • A rapid and low-cost CVD densification method for carbon/carbon composites

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Experimental program
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Effect test

Embodiment 1

[0039] (1) Carbon fiber prefabricated body 4 adopting acupuncture structure, size Φ660mm (inner diameter)×Φ690mm (outer diameter)×380mm (height), initial density of prefabricated body 4 is 0.45g / cm 3 ;The graphite inner mandrel is a cylindrical structure, the outer diameter is 3mm smaller than the inner diameter of the prefabricated body, and the slits are cut from top to bottom along the cylinder, with a slit width of 10mm. The current is 20000A, and the resistance value of graphite inner mandrel is 900μΩ;

[0040] (2) Assemble the prefabricated body 4 and the graphite inner mandrel 5 together, and use graphite paper between the graphite inner mandrel 5 and the prefabricated body 4 to perform high-temperature pretreatment together. During the process, the slit opening in the height direction of the graphite inner mandrel 5 is braced with graphite strips to ensure that the prefabricated body 4 fits with the graphite inner mandrel 5;

[0041] (3) Place the prefabricated body 4...

Embodiment 2

[0047] (1) The carbon fiber prefabricated body 4 is a winding cylindrical structure with a size of Φ660mm (inner diameter)×Φ690mm (outer diameter)×380mm (height), and the initial density of the prefabricated body 4 is 0.65g / cm 3 ;The graphite inner mandrel is a cylindrical structure, the outer diameter is 5mm smaller than the inner diameter of the prefabricated body, and the slits are cut from top to bottom along the cylinder, with a slit width of 5mm. The current is 20000A, and the resistance value of graphite inner mandrel is 2100μΩ;

[0048] (2) Assemble the prefabricated body 4 and the graphite inner mandrel 5 together, and use graphite paper between the graphite inner mandrel 5 and the prefabricated body 4 to perform high-temperature pretreatment together. During the process, the slit opening in the height direction of the graphite inner mandrel 5 is braced with graphite strips to ensure that the prefabricated body 4 fits with the graphite inner mandrel 5;

[0049] (3) P...

Embodiment 3

[0055] (1) The carbon fiber prefabricated body 4 is a needle-punched structure of mesh tire and carbon cloth, which is in the shape of a truncated cone. The size of the upper section is Φ594mm (inner diameter)×Φ680mm (outer diameter), the size of the lower end surface is Φ250mm (inner diameter)×Φ650mm (outer diameter), the height of the preform is 510mm (height), and the initial density of the preform 4 is 0.40g / cm 3 ;The graphite inner mandrel is a cylindrical structure, the outer diameter is 6mm smaller than the prefabricated inner diameter, and the slit is cut from top to bottom along the cylinder, with a slit width of 15mm. The graphite inner mandrel plays the role of product shaping and heating at the same time, and the equipment has the largest power The output current is 20000A, and the resistance value of graphite inner mandrel is 3000μΩ;

[0056] (2) Assemble the prefabricated body 4 and the graphite inner mandrel 5 together, and use graphite paper between the graphit...

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Abstract

The invention discloses a quick low-cost CVD compacting method for a carbon / carbon composite material. The method comprises the following steps: assembling a preform and an inner core mold tougher forhigh-temperature pre-treatment; placing the treated perform and inner core mold between upper and lower graphite electrodes of a deposition chamber of CVD equipment; and carrying out heating and introducing carbon source gas for 40-200h to prepare a carbon / carbon composite material product at one time. The method disclosed by the invention has the advantages and characteristics that 1, the methodintegrates advantages of a temperature differential method, a gas limiting method and a spontaneous heating characterized deposition process, so that influence of crusting of pyrolytic carbon on thesurface layer on deposition and compaction can be prevented effectively, the ability of the carbon source gas diffused to the perform is enhanced, and the deposition efficiency can be improved greatly; 2, the problem that density is not uniformly increased is solved, and the product quality is consistent; 3, the production energy consumption is low and the process and production cost is relativelylow; 4, the control degree of an air flow is high, and the utilization ratio of gas is high; 5, the perform and the graphite inner core mold are easily demolded, so that the operability is good; and6, the density state of the product can be controlled precisely, so that an accurate product effect is obtained.

Description

technical field [0001] The invention belongs to the technical field of production of carbon / carbon composite materials, and in particular relates to a fast and low-cost CVD densification method for carbon / carbon composite materials. Background technique [0002] The core process of the production of carbon / carbon composites is the densification process, that is, the process of filling the matrix carbon in the voids of the carbon fiber preform by physical or chemical means to achieve densification. Chemical Vapor Deposition (CVD) is Widely used densification methods, the traditional process has low requirements for equipment, mature process, and has the advantages of large-scale, but its production efficiency is not high, and the shortcomings of high production cost restrict the development of this process. [0003] Patent No. CN201010153124 discloses a rapid deposition method of carbon / carbon material components, which realizes the rapid densification method of CVD through t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C16/26C23C16/46C23C16/455
CPCC23C16/26C23C16/45502C23C16/46
Inventor 罗昆鹏姜召阳陈小飞曹磊张贵歧高晓佳王春梅于洪刚崔树永
Owner AEROSPACE RUITIAN CARBON MATERIALS CO LTD
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