Gas flow control method of rapid directional infiltration for high-performance carbon-based composite material

Abstract

An gas flow control method of rapid directional infiltration for carbon-based composite material includes four steps: step 1: input of gas: regulating the flow rate of a plurality of gases such as carbon source gas-natural gas, propane, diluent gas-hydrogen and the like through a gas control valve and a proton flux meter to obtain required flow rate and mixture ratio; step 2: mixing of gases: mixing the plurality of gases through a plurality of layers of graphite circular plates with holes and gaskets in a gas mixing device; step 3: preheating of gas: preheating gas flow through a preheating device in a furnace uniform temperature zone in quite short time; and step 4: output of gas and infiltration furnace pressure control: extracting gas flow by a vacuum pump and regulating the furnace pressure through an electric actuator to achieve optimal infiltration effect. The method can effectively mix, pretreat and directionally diffuse gas flow, realize the gradual deposition of pyrolytic carbon from the inside of preform to the outside and improve infiltration speed and the utilization rate of precusor, and has broad practical value and application prospect in the technical field of carbon-based composite materials.

Description

(1) Technical field [0001] The invention relates to a high-performance carbon-based composite material percolation airflow control technology, in particular to a high-performance carbon-based composite material rapid directional percolation airflow control method, which belongs to the technical field of carbon-based composite materials. (2) Background technology [0002] Due to its unique mechanical and thermophysical properties, carbon-based composites have been made into aircraft brake discs and rocket engine nozzles, which are used in aerospace fields. At present, various carbon-based composite material production companies in the world mainly use natural gas, propylene, propane, etc. as carbon source gases and hydrogen, nitrogen, etc. as diluent gases to prepare carbon fiber-reinforced carbon-based composite materials. The airflow control during the infiltration preparation of carbon-based composites determines the structure of the pyrolytic carbon, the speed of infiltra...

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Problems solved by technology

[0003] 1. Purpose: In order to overcome the disadvantages of easy surface crusting, slow deposition rate, and high production cost of the existing technology in the process of preparing carbon-based composite materials, the present invention provides a high-performance carbon-based composite material for rapid directional infiltration airflow control. method, it can effectively make gas mixing, preheating and directional diffusion, realize the gradual deposition of pyrolytic carbon from the inside of the preform to the outside and deposit structurally uniform pyrolytic carbon on the surface of carbon fibers, which improves the infiltration rate and precursor utilization , effectively avoiding the formation of carbon black during rapid directional infiltration

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