Method for preparing high-performance silicon carbide coating on surface of carbon-carbon composite thermal insulation material

Abstract

The invention discloses a method for preparing a high-performance silicon carbide coating on the surface of a carbon-carbon composite thermal insulation material, and belongs to the technical field ofthermal insulation materials. The method comprises the following steps that a carbon / carbon composite thermal insulation material initial green body is prepared, rigid carbon felt with certain initial density is customized according to the size of a required product, the rigid carbon felt is machined to achieve the dimensional accuracy according to the designed product structure and size, and thecarbon / carbon composite thermal insulation material initial green body is obtained; the carbon / carbon composite thermal insulation material initial green body is pretreated, and the surface of the carbon / carbon composite thermal insulation material initial green body is subjected to grinding, polishing, ultrasonic cleaning and drying for use; coating slurry brushing is conducted, and ceramizationtreatment is conducted; deposited carbon treatment is conducted; high temperature sintering treatment is conducted. The silicon carbide coating prepared through the method is firmly bonded with a carbon / carbon composite thermal insulation material matrix, and the coating is not cracked, the strength of the surface coating of the carbon / carbon composite thermal insulation material is greatly improved, and the service life is obviously prolonged.

Description

technical field [0001] The invention relates to a method for preparing a high-performance silicon carbide coating on the surface of a carbon-carbon composite thermal insulation material, belonging to the technical field of thermal insulation materials. Background technique [0002] Carbon-carbon composite thermal insulation material is a carbon / carbon composite material composed of carbon fiber as a reinforcement and resin carbon or deposited carbon as a matrix. It is a new type of advanced thermal field material that can be used in high-temperature environments. Carbon-carbon composite thermal insulation The material has excellent properties such as low density, small linear expansion coefficient, high temperature resistance, strong thermal shock resistance, strong chemical corrosion resistance, high purity and no pollution. At the same time, there are a large number of micropores inside, resulting in small thermal conductivity and low heat capacity. Therefore, it has very ...