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Method for preparing carbon/carbon/silicon carbide composite material

A carbon composite material and composite material technology, which is applied in the field of carbon/carbon/silicon carbide composite material preparation, can solve the problems of poor bonding between the coating and the body material, high equipment requirements, and difficult molding, and achieve excellent oxidation resistance. Raw materials are simple and easy to obtain, which is conducive to the effect of smooth diffusion

Active Publication Date: 2008-09-10
XIAN AEROSPACE COMPOSITE MATERIALS INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current SiC coating preparation method has problems such as difficulty in forming, pollution to the environment, or high requirements on equipment, and due to the mismatch of thermal expansion coefficients, poor bonding between the coating and the body material is a problem that must be considered. coating structure design
The use of carbon / silicon carbide composite materials is an effective way to achieve long-term oxidation resistance, but an important shortcoming of existing carbon / silicon carbide composite materials is that the production cycle is long, the preparation cost is too high, and the hydrogen chloride tail gas produced by certain preparation methods is harmful to the environment. There is pollution, and the service temperature of carbon / silicon carbide composite materials is only 1650°C, which is far lower than the service temperature limit of carbon / carbon composite materials (higher than 3000°C)
[0004] In addition to the above-mentioned common problems, the research on anti-oxidation technology of carbon / carbon composite materials in my country still focuses on basic theory or small sample test research due to its late start and backward technical level, and there is a big gap in engineering application.

Method used

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  • Method for preparing carbon/carbon/silicon carbide composite material
  • Method for preparing carbon/carbon/silicon carbide composite material
  • Method for preparing carbon/carbon/silicon carbide composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] (1) Acupuncture the prefabricated body with carbon cloth and carbon fiber mesh tire, and the density of the prefabricated body is 0.50±0.05g / cm 3 , through chemical vapor infiltration to a material density of 1.20g / cm 3 And a resin impregnation carbonization treatment until the material density reaches 1.40g / cm 3 ;Machining a sample of 55mm×10mm×4mm;

[0041] (2) Weigh about 500g of silicon block and place it in a graphite crucible, and then put in the graphite support plate with holes and the specimen to be treated in sequence. According to the size of the reaction chamber and the C / C composite material specimen to be treated, several For each test piece, pay attention to the distance between the samples and the inner wall of the reaction chamber, and keep the distance between 5mm and 10mm. According to the method and process parameters introduced in this patent, the needle-punched C / C composite material sample is subjected to chemical gas phase reaction treatment, a...

Embodiment 2

[0045] (1) PAN-based T300 grade 3K carbon fiber braided prefabricated body is used, and the material density reaches 1.60g / cm through chemical vapor infiltration 3 And a resin impregnation carbonization treatment until the material density reaches 1.70g / cm 3 ; Machine the inner and outer profiles to the required size.

[0046] (2) Weigh about 1 kg of silicon block and place it in a graphite or C / C composite material crucible, then put the graphite support plate with holes and the specimen to be processed in sequence, and put them in at the same time according to the size of the reaction chamber and the specimen to be treated Several test pieces. According to the method and process parameters introduced in the patent, the chemical gas phase reaction treatment of the C / C composite material is carried out. The main performance parameters of the obtained C / C / SiC composite material are as follows:

[0047] Density≥1.85g / cm 3 ;

[0048] Open porosity ≤ 0.2%;

[0049] Tensile str...

Embodiment 3

[0052] (1) Use carbon cloth and carbon fiber mesh tire cylindrical needle-punched prefabricated body, and the prefabricated body density is 0.35±0.02g / cm 3 , through chemical vapor infiltration to a material density of 1.30g / cm 3 And two times of resin impregnation and carbonization until the material density reaches 1.50g / cm 3 ; Machine added Φ40mm / Φ34mm×120mm spiral heating element.

[0053] (2) Weigh about 1 kg of silicon block and place it in a graphite crucible, and put in the graphite support plate with holes and 2 heating element specimens to be processed in turn, and pay attention to the gap between the heating element specimens and the heating element specimens and the inner wall of the reaction chamber. Contact, keep the distance between 5mm ~ 10mm. According to the method and process parameters introduced in the patent, the chemical gas phase reaction treatment is carried out to obtain the C / C / SiC composite material heating element.

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Abstract

The invention relates to a preparation method of a carbon / carbon / silicon carbide composite material. The preparation method is characterized in that: chemical gas phase permeation technology is adopted to prepare reactive carbon atom and provide protection for carbon fiber, and is combined with the resin liquid phase dipping carbonizing technology to prepare carbon / carbon composite material through adopting a pore adjusting method of a composite material blank; moreover, the density of the obtained carbon / carbon composite material is between 1.0g / cm<3> and 1.90g / cm<3>; a method according to which the gaseous atom generated through the evaporation of solid silicon and the carbon atom in the carbon / carbon composite material are formed into SiC through chemical reaction under high temperature ranging from 1,650 DEG C to 2,200 DEG C is adopted to carry out the rapid preparation of the carbon / carbon / silicon carbide composite material. Compared with body carbon / carbon composite material, the mechanical property of the carbon / carbon / silicon carbide composite material is substantially increased to an equivalent degree and has outstanding antioxidation. Moreover, the preparation method is an engineered method which can realize the efficient preparation of a small-scale thin-wall special-shaped high-performance carbon / carbon / silicon carbide composite material.

Description

technical field [0001] The invention relates to a preparation method of a carbon / carbon / silicon carbide composite material, in particular to a liquid rocket attitude control, orbit control engine thrust chamber and a solid material linear expansion coefficient, thermal conductivity and other thermal constant measuring instrument heating element Preparation method of carbon / carbon / silicon carbide composite material. Background technique [0002] Carbon / carbon composite materials have excellent high-temperature mechanical properties and good thermal shock resistance, and have become the first choice for high-temperature thermal structural components in the fields of aviation and aerospace. However, its application is limited because it is prone to oxidation in high temperature (higher than 400°C) oxidizing environment. Improving the oxidation resistance of carbon / carbon composites has always been the focus and hotspot of research in this field. Silicon carbide (SiC)-based an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/83C04B35/565C04B35/622
Inventor 李瑞珍段建军解惠贞崔红
Owner XIAN AEROSPACE COMPOSITE MATERIALS INST
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