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A kind of vapor deposition device and preparation method of carbon/carbon composite material

A carbon composite material and vapor deposition technology, which is applied in the field of vapor deposition device and carbon/carbon composite material preparation, can solve the problems of insufficient contact between carbon source gas and green body, low linear expansion coefficient and high preparation cost, and achieves good Material properties, development and application prospects, simple device structure, and high densification efficiency

Active Publication Date: 2022-05-20
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Chemical vapor deposition (CVD) is the preferred method for preparing high-performance carbon / carbon composite materials. The carbon / carbon composite materials prepared by this method have the advantages of high mechanical properties, good thermal conductivity, and low linear expansion coefficient. The key preparation technology of carbon composite materials, but the existing CVD process is not suitable for the densification of ultra-large and ultra-thick (1000mm×300mm×150mm or more) carbon / carbon composite materials. Not deep, resulting in the density of the green body after CVD is difficult to exceed 1.30g / cm 3 , the difference between inner and outer density exceeds 0.2g / cm 3 , the densification process cycle is long (about 600-800h), and the preparation cost is high

Method used

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  • A kind of vapor deposition device and preparation method of carbon/carbon composite material
  • A kind of vapor deposition device and preparation method of carbon/carbon composite material
  • A kind of vapor deposition device and preparation method of carbon/carbon composite material

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preparation example Construction

[0051] In addition, the present invention further provides a carbon / carbon composite material preparation method, comprising the following steps:

[0052] a. Prepare carbon fiber preforms;

[0053] b. The carbon fiber precast is initially graphitized to obtain the carbon fiber blank;

[0054] c. The carbon fiber blank is compacted with CVD to obtain the CVD blank,

[0055] CVD densification treatment is carried out in the vapor deposition unit described above,

[0056] When charging, the carbon fiber blank is placed on the reserved blank placement position 124 between the second intake hole 1221 and the third intake hole 1222;

[0057] d. Secondary graphitization treatment of CVD blank to obtain the initial finished product;

[0058] e. Finish the primary product to obtain the finished product.

[0059] Preferably, the carbon source gas of the CVD densification treatment is natural gas or propylene.

[0060] Preferably, during the CVD densification process, the flow rate of carb...

Embodiment 1

[0073] A. Prepare 20 pieces of carbon fiber precast, carbon fiber precast is a 2D needle punch structure, using a layer of PANCF weftless cloth and a layer of PANCF non-weft mesh tire alternate laying, no weft cloth 0 ° / 90 ° alternating laying, continuous needle punching; the size of the carbon fiber precast is 1500mm×415mm×220mm, the density is 0.58g / cm 3 ；

[0074] b. The carbon fiber precast is treated with the first graphitization to obtain the carbon fiber blank; the carbon fiber precast is loaded into the heat treatment furnace, vacuumed first, heated to 2000 ° C and kept warm for 2h, during which argon gas is filled, the furnace pressure is 0.2-3KPa, so that the carbon fiber precast is graphitized, and then cooled naturally with the furnace;

[0075] c. The carbon fiber blank is compacted with CVD to obtain the CVD blank,

[0076] CVD densification treatment is carried out in a vapor deposition device, the vapor deposition device includes the base, and the deposition ch...

Embodiment 2

[0083] A. Prepare 10 pieces of carbon fiber precast, carbon fiber precast is a 2D needle punch structure, using a layer of PANCF weftless cloth and a layer of PANCF non-weft mesh tire alternate laying, no weft cloth 0 ° / 90 ° alternating laying, continuous needle punching; the size of the carbon fiber preform is 1200mm×350mm×200mm, the density is 0.45g / cm 3 ；

[0084] b. The carbon fiber precast is treated with the first graphitization to obtain the carbon fiber blank; the carbon fiber precast is loaded into the heat treatment furnace, vacuumed first, heated to 2000 ° C and kept warm for 2h, during which argon gas is filled, the furnace pressure is 0.2-3KPa, so that the carbon fiber precast is graphitized, and then cooled naturally with the furnace;

[0085] c. The carbon fiber blank is compacted with CVD to obtain the CVD blank,

[0086] CVD densification treatment is carried out in a vapor deposition device, the structure of the vapor deposition device is the same as Example 1,...

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Abstract

The application provides a vapor deposition device, which includes a base, a material plate, and a deposition chamber. The deposition chamber includes an outer cylinder, an exhaust port, and an exhaust sleeve arranged in the outer cylinder; the exhaust sleeve includes an inner cylinder and a sleeve. The sleeve is set outside the inner cylinder, the inner cylinder and the sleeve are enclosed to form an airflow channel, and the side wall of the sleeve is provided with a vent hole; the material plate is provided with a first air inlet hole, and the first air inlet hole is located Between the barrel and the inner barrel; there is also an air intake structure on the material plate, the air intake structure includes an array of air intake holes, and the array of air intake holes is radially distributed around the exhaust sleeve; the array of air intake holes is far away from the exhaust sleeve One side is provided with the fourth air inlet. The equipment can effectively control the flow direction of the gas during the deposition process, so that it can fully contact with the green body to be processed. In addition, the present invention also provides a method for preparing carbon / carbon composite materials using the equipment, including the criterion for determining the flow rate of the carbon source gas and the principle of decreasing with the increase of CVD times.

Description

Technical field [0001] The present invention relates to the field of composite material preparation technology, in particular to a vapor deposition apparatus and a method for preparing carbon / carbon composite materials. Background [0002] Carbon / carbon composite materials have low density, high strength, high specific modulus, high thermal conductivity, low expansion coefficient, good friction performance, and good thermal shock resistance, high dimensional stability advantages, often used in high temperature ablation resistance materials, high temperature structural materials, in aviation, aerospace, nuclear energy, medicine and other fields have a good application prospects, can be used to make rocket and missile engine nozzles, aircraft and rail transit brake devices, photovoltaic field and other components. [0003] Chemical vapor deposition (CVD) is the preferred method for preparing high-performance carbon / carbon composites, the carbon / carbon composite materials prepar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/83C04B35/52C04B35/622
CPCC04B35/83C04B35/522C04B35/622C04B2235/77C04B2235/6567C04B2235/96C04B2235/9607C04B2235/9615
Inventor 熊翔张红波左劲旅熊杰徐惠娟王雅雷杨波江丙武
Owner CENT SOUTH UNIV
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