Method for rapidly preparing carbon/carbon composite material under physics field by CVD

Abstract

This invention is about the decomposition method of compound, especial about the method for depositing charcoal and carbide. The conducting layer is made up of tungsten filament, molybdenum filament and graphite layer; through the conducting layer the physical field is adjusted and controlled. We put charcoal / charcoal combined material body into the chemical gas phase depositing furnace, where the depositing temperature is controlled between 600deg.C and 1100deg.C. The carbon hydrogen gas is filled as reaction gas, while Ar or N2 is used as dilution gas. The concentration of the carbon hydrogen gas is from 5% to 100%, and the flow of the reaction gas should be between 0.2 and 1.2 square meters per hour.square meters. If you choose this invention, the densification speed of the carbon / carbon combined material can be increased, and the producing time can be reduced. You can adjust and control the structure of the thermal decomposition charcoal, and the density and uniform is good. Also, you can reduce the producing cost.

Description

Technical field: [0001] The present invention relates to compound decomposition methods, especially methods for depositing carbon and carbides. Background technique: [0002] The commonly used chemical vapor deposition method (CVI) to prepare carbon / carbon composite materials, according to the different means of kinetics, the main methods are as follows: [0003] 1. The isothermal CVI fiber green body is located in a hot-walled soaking reactor. Because there is a concentration gradient inside and outside the green body, the precursor gas and the reaction product waste gas diffuse to the inside and outside of the green body respectively under the action of the carrier gas. , thus completing the deposition chemical reaction. Disadvantages of this method: (1) The deposition time of each furnace is long, generally 600~2000h; (2) There is a density gradient, the density is low inside and high outside; (3) The surface of the green body is easy to crust before reaching the design ...

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to overcome the shortcomings of the above-mentioned chemical vapor deposition method such as long CVI cycle and poor densification uniformity, improve the densification speed of carbon / carbon composite materials, regulate the structure of pyrolytic carbon, and reduce the preparation cost

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