A kind of sic-tac coating/matrix synergistically modified c/c composite material and preparation method thereof

A composite material and synergistic modification technology, which is applied in the field of SiC-TaC coating/matrix synergistically modified C/C composite material and its preparation, can solve problems such as the inability to effectively protect the carbon matrix, achieve improved interface bonding state, and improve Coefficient of thermal expansion, the effect of improving the coefficient of thermal expansion

Active Publication Date: 2011-12-28
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The composite material prepared by this method can effectively improve the interface bonding strength between the ceramic phase, carbon fiber and carbon matrix, and increase the load-carrying capacity of the composite material, but the SiC-TaC ceramic phase introduced by this method cannot effectively protect the carbon matrix.

Method used

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  • A kind of sic-tac coating/matrix synergistically modified c/c composite material and preparation method thereof
  • A kind of sic-tac coating/matrix synergistically modified c/c composite material and preparation method thereof
  • A kind of sic-tac coating/matrix synergistically modified c/c composite material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Embodiment 1: (gradient distribution-co-deposition coating)

[0039] see figure 1 , the density is 0.80g / cm 3 Cut the C / C blank into 110×110×4mm plate-shaped C / C blank, clean it with ultrasonic waves, dry it in an oven, weigh it, and put it into a chemical vapor deposition furnace to make the reaction gas diffuse from the coating surface Enter the C / C green body and diffuse the reaction by-product gas from the non-coated surface to ensure that SiC-TaC is preferentially deposited on the coated surface of the green body, see figure 2 , 1-cover plate, 2-airflow diffusion path, 3-ablation surface, 4-non-ablation surface, 5-C / C body; vacuumize to below 50Pa, power on and heat up to the set temperature of 900°C After heat preservation, the C / C green body is subjected to matrix modification, densification and coating preparation according to the following steps: (a) pass through trichloromethylsilane (MTS)-H 2 -Ar reaction gas system, the deposition pressure is maintained ...

Embodiment 2

[0040] Embodiment 2: (gradient distribution-co-deposition coating)

[0041] see figure 1 , the density is 1.20g / cm 3 The C / C green body is cut into Φ100 / Φ70×80 ring-shaped C / C green body, cleaned with ultrasonic waves, dried in an oven, weighed, and put into a chemical vapor deposition furnace to ensure that the reaction gas diffuses from the inner surface into the C / C green body, and diffuse the reaction by-product gas from the outer surface, so that SiC-TaC is preferentially deposited on the coating surface of the green body; vacuumize to below 50Pa, send power to heat up, and reach the set temperature of 950°C For heat preservation, carry out matrix modification, densification and coating preparation on the C / C body according to the following steps: (a) MTS-H 2 -Ar reaction gas system, keep the deposition pressure at 1000Pa, infiltrate SiC into the C / C porous body; (b) when the density of the modified C / C body is 1.30g / cm 3 After that, stop feeding MTS-H 2 -Ar reaction ...

Embodiment 3

[0042] Embodiment 3: (gradient distribution-multilayer composite deposition coating)

[0043] see figure 1 , the density is 1.40g / cm 3 The C / C green body is cut into Φ100 / Φ70×80 ring-shaped C / C green body, cleaned with ultrasonic waves, dried in an oven, weighed, and put into a chemical vapor deposition furnace to ensure that the reaction gas diffuses from the inner surface into the C / C green body, and diffuse the reaction by-product gas from the outer surface, so that SiC-TaC is preferentially deposited on the coating surface of the green body, see figure 2 ; Vacuum down to below 50Pa, send power to raise the temperature, and keep warm after reaching the set temperature of 950°C. Carry out matrix modification, densification and coating preparation on the C / C green body according to the following steps: (a) MTS-H 2 -Ar reaction gas system, the furnace pressure is kept at 1000Pa, and SiC is infiltrated into the C / C porous body; (b) when the density of the modified C / C body i...

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Abstract

The invention discloses a SiC-TaC coating/matrix collaborative modified C/C composite material and its preparation method. The composite material provided by the invention comprises two parts. The portion below the surface of the C/C composite material is the matrix modified portion with the thickness being 0.1-10mm. In addition, carbide in the C/C composite material emerges in gradient distribution. The portion which is deposited on the surface of a carbon material is a coating portion with the thickness being 10-300 microns. The preparation method of the composite material comprises the following steps of: cutting a C/C green body at the density of 0.80g/cm<3>-1.60g/cm<3> into an annular shape or a plate shape, followed by ultrasonic cleaning and drying, placing into a multifunctional CVD furnace, depositing carbide on the surface layer and surface of the C/C green body by controlling deposition parameters, further densifying the green body by the use of pyrolytic carbon so as to obtain the high-density coating/matrix collaborative modified C/C composite material. The main advantages of the invention are as follows: by the penetration of carbide through the surface layer of the C/C composite material, the thermal expansion coefficient of the matrix is raised, the interfacial bonding state is improved, a continuous transition of carbide is formed between the coating and the matrix, and the metallurgical bonding is accomplished between the coating and the matrix.

Description

technical field [0001] The invention relates to a SiC-TaC coating / matrix synergistically modified C / C composite material and its chemical vapor infiltration / chemical vapor deposition preparation method, which is mainly used for high temperature, high hardness, anti-oxidation, anti-ablation and other requirements Functional structural parts. Background technique [0002] C / C composite materials have the characteristics of low density, high specific strength, thermal shock resistance, creep resistance, and the strength increases with the increase of temperature between 1000-2200 °C. They have been used in strategic missile warheads, spacecraft return capsules, and space shuttles. It is used in various aircraft such as the leading edge of the wing. However, C / C composites are easily oxidized and ablated under the conditions of high temperature, aerobic and high-speed airflow. Oxidation ablation will reduce the density, performance and function of C / C composite materials, whic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/85
Inventor 熊翔陈招科李国栋孙威王雅雷
Owner CENT SOUTH UNIV
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