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

A technology of composite heat preservation and vacuum furnace, applied in the direction of adhesive type, adhesive additive, non-polymer adhesive additive, etc., can solve the problems of inapplicability to large-scale production, failure to achieve protection effect, high price of polysilane, etc. , to achieve good oxidation resistance, good toughness, and reduce thermal stress

Active Publication Date: 2020-04-21
GANSU HAOSHI CARBON FIBER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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

Examples

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Effect test

Embodiment 1

[0046] Such as figure 1 Shown is an anti-corrosion composite thermal insulation cover felt for industrial vacuum furnaces. The cross-sectional structure of the cover felt is: the middle body is a 26mm thick graphite hard felt, and the two sides of the graphite hard felt are passed through a carbon-based / ceramic hybrid binder. Bonded with a 1.5mm thick carbon / silicon carbide sheet that has undergone high-temperature desiliconization and secondary siliconizing treatment, the outer surface of the carbon / silicon carbide sheet is bonded with a 0.5mm thick graphite foil through a carbon-based adhesive; the composite insulation cover Felt is used in industrial vacuum furnaces for heating temperatures below 1700°C. The felt has a diameter of 1000 mm.

[0047] Graphite hard felt is made of PAN-based fiber graphite soft felt through dipping, hot pressing, curing and carbonization. The density of graphite hard felt is 0.19g / cm 3 .

[0048] The preparation method of the above-mentioned...

Embodiment 2

[0052] Such as figure 1 Shown is an anti-corrosion composite thermal insulation cover felt for industrial vacuum furnaces. The cross-sectional structure of the cover felt is: the middle body is a 26mm thick graphite hard felt, and the two sides of the graphite hard felt are passed through a carbon-based / ceramic hybrid binder. Bonded with a 1.5mm thick carbon / silicon carbide sheet that has been treated with silicon removal and secondary siliconization, the outer surface of the carbon / silicon carbide sheet is deposited with a 0.4mm thick antipyretic carbon coating; the composite insulation blanket is used for heating Industrial vacuum furnace with a temperature of 1700-1800°C. The felt has a diameter of 1000 mm.

[0053] Graphite hard felt is made of PAN-based fiber graphite soft felt through dipping, hot pressing, curing and carbonization. The density of graphite hard felt is 0.19g / cm 3 .

[0054] The preparation method of the above-mentioned industrial vacuum furnace anti-c...

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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...

Claims

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Application Information

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IPC IPC(8): B32B9/00B32B9/04B32B33/00B32B7/12C09J161/06C09J161/00C09J11/04
CPCB32B9/007B32B9/04B32B33/00B32B7/12C09J161/06C09J161/00C09J11/04B32B2255/20B32B2307/752C08K3/04
Inventor 卞光煜李娜
Owner GANSU HAOSHI CARBON FIBER
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