Technology and equipment for preparing C/C composite

A composite material and process technology, which is applied in the field of preparation of C/C composite materials and its equipment, can solve the problems of low material densification rate, difficult industrialization, slow gas transmission, etc., and achieve low industrialization difficulty and densification cycle Short, avoids the effect of ineffective responses

Inactive Publication Date: 2014-08-13
HUNAN NANFANG BOYUN NOVEL MATERIAL
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, the material from the precursor to the preform still mainly depends on its diffusion, the gas transmission is slow, and the densification rate of the material is low.
[0004] The confined variable temperature and pressure difference chemical vapor infiltration process disclosed in Chinese patent 00113718.2 and the method for rapidly preparing C / C composite materials disclosed by temperature gradient chemical vapor infiltration in Chinese patent 200510096306.2 both involve the temperature gradient and pressure difference chemical vapor infiltration process, but they are High equipment requirements and difficult industrialization
Chinese patent 200310115118.0 discloses a carbon brake disc negative pressure directional flow out temperature gradient chemical vapor infiltration method, but this method is only suitable for the preparation of carbon brake discs and not for the preparation of cylindrical parts, and the scope of application is small

Method used

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  • Technology and equipment for preparing C/C composite
  • Technology and equipment for preparing C/C composite
  • Technology and equipment for preparing C/C composite

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Embodiment 1: Device embodiment

[0029] Referring to the accompanying drawings, the embodiment of the equipment for preparing C / C composite materials in the present invention includes a furnace shell, a heating element 6, and a prefabricated body 3. An air inlet 8 is provided above the furnace shell, and an insulating layer 7 is provided on the inner wall of the furnace shell , the inner and outer thermocouples 13 and outer thermocouples 12 for measuring the temperature of the inner and outer sides of the prefabricated body 3 are respectively provided on the inner and outer sides of the prefabricated body 3, which are used to detect the temperature gradient formed in the thickness direction of the prefabricated body 3, and also include inner tooling 5, The outer tooling 4 and the cover plate 9, the inner tooling 5 is placed inside the prefabricated body 3, the inner tooling 5 is placed outside the heating body 6, the outer tooling 4 is placed outside the preformed body ...

Embodiment 2

[0033] Embodiment 2: preparation process embodiment ①

[0034] The embodiment of the process for preparing cylindrical C / C composite materials in the present invention includes the following steps:

[0035] (1) Preform 3 pretreatment: make the density 0.5 g / cm 3 , A cylindrical 2.5D carbon fiber preform 3 with a size of Φ660mm×Φ600mm×300mm is placed in a high-temperature furnace, and subjected to high-temperature pretreatment at 1800°C for 2 hours;

[0036] (2) Tooling preparation: According to the shape and size of the prefabricated body 3, process the heating element 6, the outer tooling 4, and 7 pieces of the prefabricated body 3. In the area corresponding to the space formed by the inner tooling 5 and the prefabricated body 3, there are 20 holes with a diameter of 30mm. In the area corresponding to the space formed by the outer tooling 4 and the prefabricated body 3, there are 10 cover plates 9 with a diameter of 18mm air extraction holes 10, a material carrier plate 2 an...

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Abstract

The invention discloses a technology and equipment for preparing a C / C (carbon / carbon) composite. The technology for rapidly preparing the C / C composite comprises the following steps that (1) a preform is pretreated; (2) tools are prepared; (3) furnace loading is conducted; (4) temperature gradient differential CVI (chemical vapor infiltration) treatment is conducted; (5) heating of a heating element and input of mixed gas are stopped sequentially after 100-300h; and (6) a cover plate, the outer tool, the preform and the inner tool are taken out to form the C / C composite with density of 1.4-1.7g / cm<3>. The invention further discloses the equipment for preparing the C / C composite. According to the technology and the equipment, the operation is simple; the densification period is short; the industrial difficulty is small; the densification rate is high; ineffective reaction can be avoided; the carbon yield can be increased; and pollution of a vacuum system can be prevented.

Description

technical field [0001] The invention relates to a process and equipment for rapidly preparing carbon / carbon (C / C) composite material parts by using a temperature gradient pressure difference chemical vapor phase infiltration method (CVI). Background technique [0002] The current main process for preparing C / C composites is the isothermal CVI process, which is simple and easy to operate, and can simultaneously densify multiple prefabricated bodies of different sizes and shapes. / C composites have potential. However, during the preparation process using the isothermal CVI process, pyrolytic carbon will be preferentially deposited on the surface of the preform, which will prematurely close the pores on the surface of the preform and affect its internal densification. Usually, it is necessary to use low temperature and low gas concentration to reduce the reaction speed. And multiple mechanical processing to remove the surface crust to open the pores, so the preparation cycle o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/83C04B35/622F27B17/00
Inventor 蒋建纯郑湘林康志卫崔金黄能武姚勇刚罗中保
Owner HUNAN NANFANG BOYUN NOVEL MATERIAL
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