Preparation method of carbon/carbon composite material thin-walled cylinder

Abstract

The invention provides a preparation method of a carbon/carbon composite material thin-walled cylinder, and is used for solving the problems of long period, low efficiency and low product strength ofa carbon/carbon composite cylinder preparation process in the prior art. The preparation method of the carbon/carbon composite material thin-walled cylinder comprises the steps: electrifying and heating a carbon fiber cylinder prefabricated body in a vacuum deposition chamber, and internally heating the cylinder, so as to enable the cylinder prefabricated body to be non-uniformly heated on cylinder walls with different radial wall thicknesses and have a temperature gradient; and introducing a deposition carbon source mixed gas into the vacuum deposition chamber, and carrying out uniform carburization in carbon fibers of the cylinder wall based on the temperature gradient to obtain the carbon/carbon composite material thin-walled cylinder with the density of 1.5-1.8 g/cm<3>. According to the invention, the positions with different thicknesses on the cylinder wall have uniform carburization amount, the mechanical strength is improved, the service life is prolonged, an external heat source is not needed to provide high temperature, the energy consumption is reduced, the production period is shortened, the production efficiency is improved, and batch production can be realized.

Description

technical field [0001] The invention belongs to the field of preparation of carbon-based composite material structural parts, and in particular relates to a preparation method of a thin-walled cylinder of carbon / carbon composite material. Background technique [0002] Carbon / carbon composites are carbon fiber reinforced carbon matrix composites with low density (<2.0g / cm 3 ), high strength, high thermal conductivity, low expansion, high temperature resistance, and dimensional stability at high temperatures, and are widely used in various industries. In the photovoltaic industry, single crystal silicon or polycrystalline silicon is usually prepared by high temperature drawing or melting. The crystallization process of monocrystalline silicon or polycrystalline silicon is slow and requires high temperature conditions. Carbon / carbon composite thin-walled cylinders are usually used as crucibles or crucible walls, heat insulation cylinders, guide cylinders, insulation barrels...

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Problems solved by technology

However, the deposition process of the above method is carried out in a high-temperature vacuum furnace with uniform temperature, and the deposited carbon coating is not uniform in the radial direction of the wall thickness of the gu

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