Guide shell made from carbon/carbon composite material and production method

Abstract

The invention discloses a guide shell which is simple to produce, has a good insulation effect and is made from a high-strength carbon/carbon composite material. The guide shell provided by the invention comprises a cylindrical shell and is characterized in that the cylindrical shell comprises an outer cylinder (2) and an inner cylinder (3); one end of the outer cylinder (2) and that of the inner cylinder (3) are connected by a flange (1); the other ends are connected by a connecting ring (5) to form an integral body; carbon felt (4) is disposed between the outer cylinder (2) and the inner cylinder (3); the outer cylinder (2), the inner cylinder (3), the flange (1) and the connecting ring (5) are all prepared by the carbon/carbon composite material with the density being 1.0g/cm<3>-1.4g/cm<3>; and the density of the carbon felt (4) is 0.1g/cm<3>-0.2g/cm<3>. A production method of the guide shell comprises the following steps of: (1) processing for molding; (2) assembling of the cylindrical shell; and (3) purifying step. The production method is simple and easy to operate; in addition, by the adoption of the production method, the prepared guide shell provided by the invention has stronger thermal insulation performance and mechanical properties than graphite guide shells, the scour resistance and corrosion resistance of the guide shell surface is improved, and the slag-and-block dropping phenomenon on the surface of the guide shell is prevented.

Description

technical field [0001] The invention relates to a high-temperature furnace component, in particular to a flow guide tube for a single crystal silicon drawing furnace, in particular to a carbon / carbon composite material guide tube and a production method thereof. Background technique [0002] The thermal field system of the monocrystalline silicon drawing furnace has a great influence on the whole bar rate and yield of monocrystalline silicon, the pulling speed, and the quality of the monocrystalline silicon rod. Therefore, the thermal field system design and the key components in the thermal field The selection and use of materials have attracted much attention. The draft tube is one of the key components of the thermal field system of the single crystal silicon drawing furnace, and it is mainly used to control the temperature gradient of the thermal field and guide the argon flow. At present, the guide tube of a single crystal silicon drawing furnace is generally made of a...

AI Technical Summary

Problems solved by technology

From the effect of use, this guide tube has the following disadvantages: first, the carbon felt is easy to absorb the impurities volatilized from the molten polysilicon entering from the joint, which reduces the thermal insulation performance; second, graphite is a good conductor of heat. The heat preservation effect is poor; the third is that the graphite has low strength, it is easy to be damaged during use, and the service life is short; the fourth is that the inner and outer cylinders of large-sized graphite are difficult to form, and there are many consumables

However, in actual production, the preparation process of the overall guide tube with a large difference in inner and outer density is complicated and the cost is high.

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