Preparation method of carbon/carbon composite thermal insulation material containing anti-oxidization coating

Abstract

The invention relates to a preparation method of a carbon / carbon composite thermal insulation material containing an anti-oxidization coating. The method mainly comprises the following steps: mixing soluble thermosetting phenolic resin with ethanol evenly to form an impregnant; spraying the impregnant on the surface of a carbonization felt, and then carrying out hot press molding; mixing SiC powder, thermosetting resin and ethanol evenly at a certain ratio, coating the surface of a hot press plate, putting the hot press plate into a graphitization furnace and graphitizing; and cooling to form the carbon / carbon composite thermal insulation material with a ceramic-coated surface. According to the preparation method, the problem that the carbon / carbon composite thermal insulation material is easily oxidized in the use procedure or the production process is solved, and the service life of the carbon / carbon composite thermal insulation material is greatly prolonged. In addition, the preparation method is synchronous with the preparation process of the carbon / carbon composite thermal insulation material, and is simple and feasible.

Description

technical field [0001] The invention belongs to the technical field of carbon / carbon composite heat insulation materials, and specifically relates to a carbon / carbon composite heat insulation molding material coated with an anti-oxidation coating on the surface, which is directly used in a high-temperature furnace protected by vacuum and inert gas It is especially used in polysilicon ingot furnaces and single crystal silicon Czochralski furnaces. Background technique [0002] Carbon / carbon composite insulation material is a new type of high-performance structure with high strength and high modulus, excellent heat insulation and low density. It is widely used in aerospace, communication optical fiber, new energy, high-performance ceramic manufacturing, and crystal growth. , especially the development of the new energy photovoltaic industry, the heat insulation materials of polycrystalline ingot furnace and single crystal furnace heat field have attracted wide attention and be...

AI Technical Summary

Problems solved by technology

At present, carbon / carbon composite heat insulation molding materials have uniform internal and surface density, and the surface layer has not been densified, which makes the heat insulation performance, dust generation and service life unsatisfactory.

The existing surface treatment methods mostly use graphite paper or carbon cloth. Although it can solve the problem of easy powder falling, it does not play a good role in improving the carbon volatilization and oxidation under high temperature conditions.

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