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Quick carbon deposition method of carbon/carbon material member

A technology of carbon materials and components, applied in the field of rapid prototyping of carbon/carbon materials, which can solve the problems of punching holes in products, and achieve the effects of low porosity, short production cycle, and suitable for large-scale and mass production

Active Publication Date: 2011-11-09
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a fast carbon deposition method for carbon / carbon material components, to overcome the deficiencies of the existing densification technology, and to solve the problem that the product needs to be punched in the existing rapid CVI process of the temperature difference method

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Examples

Experimental program
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Effect test

Embodiment 1

[0025] (1) Using PAN-based 12k carbon fiber to prepare a carbon fiber prefabricated body with a needle-punched structure without weft cloth and mesh tire. The carbon fiber prefabricated body is a hollow cylinder with a size of Φ600mm (outer diameter)×Φ540mm (inner diameter)×800mm (height), The initial density is 0.45g / cm 3 .

[0026] (2) Put the carbon fiber preform into a high-temperature graphitization furnace for high-temperature pretreatment. The high-temperature pretreatment temperature is 2000°C, and the holding time is 3h. After high-temperature pretreatment, its bulk density is 0.425g / cm 3 .

[0027] (3) if figure 1 As shown, the carbon fiber preform 4 that has been pretreated at high temperature in step (2) is bound to the heating element 2 with 6k carbon fibers, and the carbon fiber preform 4 and the heating element 2 are separated 3 by two layers of kraft paper. The heating element is made of graphite material, and the size is Φ540mm (outer diameter)×Φ500mm (inne...

Embodiment 2

[0031] (1) Use PAN-based 6k carbon fiber to prepare a carbon fiber prefabricated body with a needle-punched structure without weft cloth and mesh tire. The carbon fiber prefabricated body is a hollow cylinder with a size of Φ650mm (outer diameter)×Φ540mm (inner diameter)×400mm (height) , the initial density is 0.46g / cm 3 .

[0032] (2) Put the carbon fiber prefabricated body into a high-temperature graphitization furnace for high-temperature pretreatment. The high-temperature pretreatment temperature is 2200°C, and the temperature is kept for 1 hour. After high-temperature pretreatment, its bulk density is 0.432g / cm 3 .

[0033] (3) if figure 1 As shown, the carbon fiber preform that has been pretreated at high temperature in step (2) is bound to the heating element 2 with 12k carbon fibers, and the carbon fiber preform 4 and the heating element 2 are separated by flexible graphite paper 3 with a thickness of 0.5mm. The heating element is made of graphite material, and its ...

Embodiment 3

[0037] (1) Use PAN-based 6k carbon fiber to prepare a plain-weave carbon cloth laminated structure. The carbon fiber preform is flat, with a size of 800mm×800mm×50mm and an initial density of 0.65g / cm 3 .

[0038] (2) Put the carbon fiber prefabricated body into a high-temperature graphitization furnace for high-temperature pretreatment. The high-temperature pretreatment temperature is 2000°C, and it is kept for 2 hours. After high-temperature pretreatment, its bulk density is 0.63g / cm 3 .

[0039](3) Bonding 0.5 mm thick flexible graphite paper to the heating element with phenolic resin, and then bonding the carbon fiber preform that has been pretreated at high temperature in step (2) to the flexible graphite paper with phenolic resin. The heating element is made of graphite material, and the size is 900mm×900mm×20mm. An upper electrode 1 and a lower electrode 6 are respectively installed on the upper and lower sides of the heating element 2 . The upper electrode and the l...

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Abstract

The invention provides a quick carbon deposition method of a carbon / carbon material member, which comprises the following steps: (1) putting a carbon fiber preform into a high-temperature graphitizing furnace for high-temperature pretreatment; (2) fixedly connecting the carbon fiber preform with a heating unit, and isolating the carbon fiber preform from the heating unit by an isolator; (3) putting the carbon fiber preform and the heating unit assembly into a deposition chamber, putting a thermocouple on the external surface of the carbon fiber preform, vacuumizing for eliminating atmosphere firstly, and then, introducing reaction gas; and (4) heating the heating unit, and carrying out vapor deposition of carbon for 20-200h to prepare the carbon / carbon material member once. In the method of the invention for preparing the carbon / carbon member, the thermocouple only needs to be put on the external surface of the member, thus the member does not need to be perforated in the process of preparation, and the integrity of the member can be kept. The method of the invention has short production cycle and low process cost, can realize the purpose of quick densification, and is suitable for large-scale production in batches.

Description

technical field [0001] The invention relates to a method for rapid prototyping of carbon / carbon materials, in particular to a method for rapidly preparing large-scale carbon / carbon material components by using a gas-phase carbon deposition technology of a temperature difference method. Background technique [0002] The densification method of carbon / carbon materials is to fill the pores with some kind of carbon matrix, so that the carbon fiber reinforced skeleton can reach a high volume density from a low volume density. Chemical vapor deposition (CVD) carbon and liquid phase immersion carbonization are the most widely used densification methods. Among them, the liquid phase impregnation carbonization carburizing technology has the problems of high requirements for equipment and unstable product quality. First, both impregnation equipment and carbonization equipment require a large capacity; second, no matter resin carbon or pitch carbon, there is a carbonization process. T...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/02
Inventor 杨村林姜召阳韩钢韩渤涛唐正华
Owner AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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