Preparation and carbonization method of needle-punched pre-oxidative fiber prefabricated part

Abstract

The invention relates to a preparation and carbonization method of a needle-punched pre-oxidative fiber prefabricated part, comprising two steps: step I: the preparation of the prefabricated part; long pre-oxidative fibers are chosen to be paved into a laid fabric, the pre-oxidative fibers are cut short to be paved into a mesh tire; step II: the carbonization of the prefabricated part: the prefabricated part is fixed by a graphite plate 2 and is filled in a carbide furnace, gas valves 8 and 13 are closed, a gas valve 11 is opened, a vacuum pump is started to vacuumize to be below 0.1MPa, and then the valve 11 is closed, the valve 8 is opened, and then high-purity nitrogen is blown in to lead air pressure to be 0.1MPa, temperature programming carbonization is carried out at a certain speed, after the temperature reaches to set temperature, the room temperature is cooled naturally under the protection of nitrogen at normal pressure. The method breaks through the limitation that the carbon matrix composite prefabricated part is prepared domestically by carbon fibers mainly, simplifies the preparation procedures and reduces the preparation cost, and the prepared prefabricated part can well meet the requirements of preparing the high-performance carbon matrix composite material.

Description

(1) Technical field [0001] The invention relates to a preparation and carbonization method of an acupuncture pre-oxidized silk prefabricated body, and belongs to the technical field of carbon-based composite material prefabricated body preparation. (2) Background technology [0002] Carbon fiber-reinforced carbon-based composites are widely used in aerospace and other cutting-edge technical fields due to their unique high-temperature mechanics, thermophysics, and friction and wear properties. The structure and properties of the preform have an important impact on the final performance of the carbon matrix composites. At present, there are three main types of forming technologies for carbon-based composite prefabricated bodies: carbon cloth or needle-punched thin felt lamination, needle-punched carbon fiber (pre-oxygenated filament) quasi-three-way integral structure, and short-fiber resin molding. British Dunlop Company adopts pre-oxidized wire needle-punched thin felt lami...

AI Technical Summary

Problems solved by technology

Acupuncture technology is a prefabricated body preparation technology widely used at home and abroad. It solves the disadvantage of poor z-direction performance of carbon discs.

Because the use of carbon fiber as needle felt is easy to cause fiber breakage and needle breakage, the preparation process is complicated and the cost is high, and the modulus of pre-oxygenated yarn is low, and it is not easy to break during the needle punching process, so pre-oxidized yarn is used as the preform Raw materials have become the main trend in the preparation of high-performance carbon-based composites

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