Preparation method of high-performance ultra-large and ultra-thick carbon/carbon composite material

A carbon composite material, high-performance technology, applied in the field of preparation of high-performance ultra-large and ultra-thick carbon/carbon composite materials, can solve the problems of low mechanical and thermal conductivity, low product qualification rate, high linear expansion coefficient, etc., and achieve thermal conductivity High, high product qualification rate, low linear expansion coefficient effect

Pending Publication Date: 2021-06-25
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the mass production process of ultra-large and ultra-thick carbon / carbon composite materials, quality problems such as product deformation, delamination, and cracks are prone to occur during high-temperature heat treatment. The product qualification rate is not high, and the mechanical and thermal conductivity coefficients are low, and the linear expansion coefficient is high.

Method used

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  • Preparation method of high-performance ultra-large and ultra-thick carbon/carbon composite material
  • Preparation method of high-performance ultra-large and ultra-thick carbon/carbon composite material
  • Preparation method of high-performance ultra-large and ultra-thick carbon/carbon composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] a. Prepare 15 pieces of carbon fiber prefabricated body. The carbon fiber prefabricated body is a 2D needle-punched structure. A layer of PANCF non-weft cloth and a layer of PANCF non-weft cloth mesh tire are alternately laid, and the non-weft cloth is alternately laid at 0° / 90°. Made by continuous needle punching; the size of the carbon fiber preform is 1370mm×390mm×190mm, and the density is 0.58g / cm 3 ;

[0044] b. Carry out primary graphitization treatment on the carbon fiber prefabricated body to obtain the carbon fiber green body; put the carbon fiber prefabricated body into the heat treatment furnace, first evacuate, raise the temperature to 2000°C and keep it warm for 2 hours, during which argon gas is filled, and the furnace pressure is 0.2-3KPa , to graphitize the carbon fiber preform, and then cool it naturally with the furnace;

[0045] c. Carry out CVD densification treatment on the carbon fiber green body, put the carbon fiber green body into a chemical va...

Embodiment 2

[0056] a. Prepare 35 pieces of carbon fiber prefabricated body. The carbon fiber prefabricated body is a 2D needle-punched structure. A layer of PANCF non-weft cloth and a layer of PANCF non-weft cloth mesh are alternately laid, and the non-weft cloth is alternately laid at 0° / 90°. Made by continuous needle punching; the size of the carbon fiber preform is 1240mm×340mm×170mm, and the density is 0.45g / cm 3 ;

[0057] b. Carry out primary graphitization treatment on the carbon fiber prefabricated body to obtain the carbon fiber green body; put the carbon fiber prefabricated body into the heat treatment furnace, first evacuate, raise the temperature to 2000°C and keep it warm for 2 hours, during which argon gas is filled, and the furnace pressure is 0.2-3KPa , to graphitize the carbon fiber preform, and then cool it naturally with the furnace;

[0058] c. Carry out CVD densification treatment on the carbon fiber green body, put the carbon fiber green body into a chemical vapor d...

Embodiment 3

[0069] a. Prepare 50 carbon fiber prefabricated bodies. The carbon fiber prefabricated body is a 2D needle-punched structure. A layer of PANCF non-weft cloth and a layer of PANCF non-weft cloth mesh are alternately laid, and the non-weft cloth is alternately laid at 0° / 90°. It is made by continuous needle punching; the size of the carbon fiber preform is 1015mm×315mm×165mm, and the volume density of the felt body is 0.35g / cm 3 ;

[0070] b. Carry out primary graphitization treatment on the carbon fiber prefabricated body to obtain the carbon fiber green body; put the carbon fiber prefabricated body into the heat treatment furnace, first evacuate, raise the temperature to 2000°C and keep it warm for 2 hours, during which argon gas is filled, and the furnace pressure is 0.2-3KPa , to graphitize the carbon fiber preform, and then cool it naturally with the furnace;

[0071] c. Carry out CVD densification treatment on the carbon fiber green body, put the carbon fiber green body i...

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Abstract

The invention provides a preparation method of a high-performance ultra-large and ultra-thick carbon / carbon composite material. The preparation method comprises the following steps: A, preparing a carbon fiber preform; B, performing primary graphitization treatment on the carbon fiber preform to obtain a carbon fiber blank; C, carrying out CVD densification treatment on the carbon fiber green body to obtain a CVD green body; D, carrying out secondary graphitization treatment on the CVD green body to obtain a graphitized green body; E, sequentially carrying out dipping curing treatment, carbonization treatment, high-temperature heat treatment and machining treatment on the graphitized green body; F, repeating the step E until the density of the graphitized green body reaches a target value to obtain a primary finished product; and G, performing finish machining on the primary finished product, and obtaining a finished product. The product prepared by the method is high in percent of pass and excellent in performance, and batch preparation of the high-performance ultra-large and ultra-thick carbon / carbon composite material can be realized.

Description

technical field [0001] The invention relates to the technical field of preparation and processing of composite materials, in particular to a preparation method of a high-performance ultra-large and ultra-thick carbon / carbon composite material. Background technique [0002] Carbon / carbon composite material is a carbon matrix composite material reinforced by carbon fiber and its fabric. It has low density, high strength, high specific modulus, high thermal conductivity, low expansion coefficient, good friction performance, good thermal shock resistance and stable size. It is one of the few candidate materials used above 1650°C, and its maximum theoretical temperature is as high as 2600°C. It is often used in high-temperature ablation-resistant materials and high-temperature structural materials. It is widely used in aviation, aerospace, nuclear energy, medicine and civil applications. It has a good application prospect and can be used for rocket and missile engine nozzles, air...

Claims

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Application Information

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IPC IPC(8): C04B35/83C04B35/622
CPCC04B35/83C04B35/622C04B2235/48C04B2235/5256C04B2235/616C04B2235/614C04B2235/6562C04B2235/6567C04B2235/77C04B2235/95C04B2235/96
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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