SiC composite coating for porous thermal insulation carbon material and preparation method thereof

Abstract

The invention provides a SiC composite coating for a porous thermal insulation carbon material and a preparation method of the SiC composite coating. The coating sequentially comprises a carbon sealing and filling layer, a SiC transition layer prepared through a brush coating reaction and a SiC outer coating prepared through a chemical vapor deposition method from inside to outside. According to the invention, the performance of the porous heat-insulating carbon material is ensured, the oxidation protection problem of the porous heat-insulating carbon material is effectively solved, and the high-temperature oxidation resistance of the material can be effectively improved. The structure of the carbon sealing and filling layer can effectively prevent a coating raw material from permeating into the porous carbon felt body, the carbon sealing and filling layer can form pinned interface combination with the porous carbon felt and form firm chemical combination with the SiC transition layerprepared through a brush coating reaction, and the combining capacity of the coating and a porous carbon felt is improved. Besides, the coating preparation process has low requirements on the surfaceof a base material and equipment, is not limited by the shape and the size of the base material, has the advantages of simple equipment process, easiness in operation, capability of preparing large-size and complex-shape special-shaped parts and the like, and has a wide industrial application prospect.

Description

technical field [0001] The invention relates to the field of material technology, in particular to a SiC composite coating for a porous heat-insulating carbon material and a preparation method thereof. Background technique [0002] The energy problem has become a major problem that plagues social and economic development. While developing various new energy sources, people are also committed to developing various new heat insulation and energy-saving materials to achieve energy saving. Carbon felt has light weight, low thermal conductivity, small specific heat capacity, low thermal expansion coefficient, excellent high temperature stability, and because it contains a large number of pores inside, it has excellent thermal insulation performance, and has been widely used as thermal insulation material monocrystalline silicon furnace. Although the porous structure of carbon felt has excellent heat insulation effect, the easy oxidation of carbon materials affects the service l...

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Problems solved by technology

The invention provides a SiC composite coating for porous heat-insulating carbon materials and a preparation method thereof. By constructing a carbon sealing layer on the surface of the carbon felt, the problem of the infiltration of subsequent coating materials into the porous carbon felt is effectively solved, avoiding the The direct reaction between the coating material and the carbon felt, the existence of the carbon sealing layer can not only form a pinning interface combination with the porous carbon felt, but also form a firm chemical bond with the SiC transition layer prepared by the brushing reaction, effectively solving the problem of The problem of the combination of coating and porous carbon felt; in addition, through the preparation of anti-oxidation SiC multilayer composite coating, while ensuring the performance of porous thermal insulation carbon materials, it effectively solves the problem of oxidation protection of porous thermal insulation carbon materials, effectively improving High temperature oxidation resistance and service life of materials

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