Gas-phase permeation method of cyclocarbon/carbon composite material

Abstract

The invention provides a gas-phase permeation method of a cyclocarbon/carbon composite material. Stacked prefabricated bodies of a stock column I and a stock column II are alternately used for sectional deposition, the flowing direction of gaseous precursor reaction gas is changed, and gas-phase permeation densification is carried out in two stages; firstly, gaseous precursor gas reacts and flowsfrom the center of the prefabricated bodies to the periphery of the prefabricated bodies; secondly, after the prefabricated bodies are converted from the stock column I to the stock column II, gaseousprecursor reaction gas flows from the periphery of the prefabricated bodies to the center of the prefabricated bodies, the flowing direction of the gaseous precursor reaction gas is controlled and changed, the uniformity of the product density is improved, the densification time is shortened, and rapid deposition of the high-density composite material is achieved. According to the method, the stacked prefabricated bodies of the stock column I and the stock column II are alternately used for sectional deposition, the gas flow direction of the gaseous precursor is controlled and changed, the product density uniformity is improved, the densification time is shortened, and rapid deposition of the high-density composite material is achieved. The method is suitable for being used as a cyclocarbon/carbon composite material gas-phase permeation method.

Description

technical field [0001] The invention relates to a gas-phase infiltration method of a ring-type carbon / carbon composite material. Background technique [0002] Chemical vapor infiltration (CVI) is the preferred process method for preparing carbon / carbon composite materials. It is to place the carbon fiber prefabricated body in a special CVI furnace, heat it to the required temperature, and feed the gaseous precursor at the bottom. After the gas cracks, it diffuses into the In the prefabricated body with larger pores, pyrolytic carbon is deposited around the carbon fiber and in the pores to make the prefabricated body finally form a carbon / carbon composite material. This process is referred to as the CVI densification process. [0003] There are mainly the following types of carbon / carbon composite materials produced by CVI process: [0004] 1. Isothermal method CVI: the most widely used equipment, which is characterized by mass production and stable performance, but the depo...

AI Technical Summary

Problems solved by technology

This method alternately uses material column I and material column II to stack preforms and deposit them in sections, and controls and changes the flow direction

Images