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Device and method for preparing carbon/carbon composite material with gradient distribution density

A carbon composite material and gradient distribution technology, which is applied in the field of devices for preparing carbon/carbon composite materials, can solve the problem of insignificant gradient distribution characteristics and achieve the effect of small dependence

Active Publication Date: 2008-07-09
XIAN AEROSPACE COMPOSITE MATERIALS INST
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Problems solved by technology

However, the obtained density is relatively uniform, and the gradient distribution characteristics are not significant.

Method used

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  • Device and method for preparing carbon/carbon composite material with gradient distribution density

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Embodiment Construction

[0025] As shown in Figure 1, a device for preparing a carbon / carbon composite material whose density is distributed in gradients comprises a chemical vapor infiltration furnace body 2, a furnace cover 1 and a furnace bottom cover 15, and the upper part of the furnace body 2 is provided with a vacuum The air inlet 3, the furnace body 2 is provided with a thermal insulation blanket 14 and a thermal insulation cover plate 4, the thermal insulation blanket 14 is provided with a graphite heating element 5, and the inner part of the graphite heating element 5 is equipped with a graphite gas collector 16, so The graphite gas collector 16 is provided with a perforated cover plate 10 for the air distribution chamber to be infiltrated with the prefabricated body 8, and the upper part of the graphite gas collector 16 is located at the perforated cover plate 10 of the gas distribution chamber. The lower part of the perforated cover plate 10 of the gas distribution chamber is a gas distribu...

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Abstract

The invention relates to a device of carbon / carbon composite material of which the density distributes in gradient and a process for preparation. Basing on soaking method isothermal chemical vapor infiltration technology of preparing carbon / carbon composite material, the outer and inner surfaces of the precast member is filled with high concentration reacting gas and inert protective gas or low concentration reacting gas, using the concentration of the different reacting gas of the outer and inner surfaces to control gas to flow along the predetermined direction, remarkable reacting gas concentration gradient is radically formed along the member, using the different deposition rate of different reacting gas concentration under the condition of the same temperature to obtain the carbon / carbon composite material the density of which is outer high and inner low and is distributed in gradient. The invention can be used for researching solid rocket engine gradient function polybasic base composite material throat insert with different decomposition carbon content along radial direction and polybasic carbon base carbon / carbon composite material plane brake wheel and the like, which is suited for solid rocket engine throat insert, various plane carbon brake stator and the tail wheel structure.

Description

technical field [0001] The invention relates to a device and method for preparing carbon / carbon composite materials, in particular to a device and method for preparing carbon / carbon composite materials whose density is distributed in gradients. Background technique [0002] The application of density gradient carbon / carbon composites mainly utilizes the different properties of different matrices or different types of carbon in composite materials to carry out precise design of composite material structure. For example, to provide blanks for carbon-refractory metal carbide multi-component matrix composites and mixed matrix carbon-carbon / carbon composites to obtain composite materials with ideal structure and performance characteristics. [0003] At present, the preparation method of density gradient composite materials is mainly realized by using thermal gradient chemical vapor infiltration (CVI) process. The principle is to use the different deposition rates of carbon source...

Claims

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Application Information

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IPC IPC(8): C04B35/83C04B35/622
Inventor 李瑞珍李晋段建军解惠贞王翔
Owner XIAN AEROSPACE COMPOSITE MATERIALS INST
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