Anti-corrosion composite heat preservation cover felt for industrial vacuum furnace and preparation method thereof

Abstract

The invention discloses an anti-corrosion composite heat preservation cover felt for an industrial vacuum furnace and a preparation method thereof. The anti-corrosion composite heat preservation coverfelt sequentially comprises a graphite foil or an antipyretic carbon coating, a carbon / silicon carbide porous layer and a graphite felt layer from the surface to the interior, and the layers are bonded through a carbon-based silicon binder or a carbon-based / ceramic binder at high temperature. In the using process, the surface graphite foil or the antipyretic carbon coating and the silicon steam are used for in-situ production of the silicon carbide surface, and the silicon carbide layer and the carbon / silicon carbide layer are combined to provide efficient corrosion resistance. Compared witha traditional heat preservation cover material, the added carbon / silicon carbide layer not only improves physical strength, but also optimizes matching of thermal expansion coefficients and hardness of surface silicon carbide and a base body, and the service life of the cover felt under oxidation and silicon steam corrosion is remarkably prolonged. The cover felt is mainly damaged on the surface and a part of the carbon / silicon carbide layer, and can be maintained and renovated by polishing and re-coating. The cover felt is low in cost, long in service life and suitable for industrial production.

Description

technical field [0001] The invention relates to the technical field of carbon fiber composite materials, in particular to an anti-corrosion composite thermal insulation cover felt for industrial vacuum furnaces and a preparation method thereof, which is applied to heat insulation of vacuum furnaces under the conditions of silicon vapor corrosion atmosphere, a small amount of oxygen and high temperature. Background technique [0002] In the production of photovoltaic monocrystalline silicon, high-temperature ceramic reaction sintering or preparation of ceramic matrix composites, heat insulation materials usually have to withstand high temperatures of 1400-1800 ° C, accompanied by airflow erosion and high-temperature steam corrosion (usually silicon steam) and trace amounts of oxidation. Under such extreme conditions, the requirements for heat insulation materials are: low thermal conductivity, which can reduce heat transfer to the furnace cover and play a role of heat preserv...

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Problems solved by technology

This method has the following defects: thermal insulation materials generally need a smooth surface to reflect heat into the furnace to achieve the effect of thermal insulation and energy saving; layer; according to the method described in the patent, impregnation can only form loose silicon carbide once, but cannot achieve the ideal protective effect; the current price of polysilane is relatively high, and it is not suitable for large-scale production

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