Graphite electrode and polycrystalline ingot furnace

Abstract

The embodiment of the invention discloses a graphite electrode which is applied to polycrystalline ingot furnaces. The graphite electrode comprises an electrode column and a boss which are of a hollow cylindrical structure, and the diameter of the electrode column is less than that of the boss; an insulating ceramic tile is arranged on the outside of the electrode column and wraps the electrode column; an insulating ceramic gasket is arranged on the boss and is of a cylindrical structure, and the lower surface of the insulating ceramic gasket props against the upper surface of the boss; the upper surface of the insulating ceramic gasket is higher than the lower surface of the electrode column, the lower surface of the insulating ceramic gasket is lower than that of the electrode column; the lower ends of the electrode column and the insulating ceramic gasket are sleeved at the insulating ceramic gasket; and an anti-corrosion tile is also arranged on the outside of the electrode column. The embodiment of the invention also discloses a polycrystalline ingot furnace. According to the invention, the insulating property of the insulating ceramic arranged on the graphite electrode can be protected, thus effectively protecting the graphite electrode and prolonging the service life of equipment.

Description

technical field [0001] The invention relates to the technical field of polycrystalline silicon ingot casting, in particular to a graphite electrode and a polycrystalline ingot casting furnace. Background technique [0002] Ingot casting furnace is a special equipment specially designed for solar energy industry, and it is a necessary equipment for polysilicon ingot casting. Taking polycrystalline ingot furnace (DSS) as an example, DSS mainly includes: furnace body, heat insulation roof, heating device, crucible and graphite electrode. Wherein, the graphite electrode includes: a pole post and a boss, both of which are open up and down, have a hollow cylindrical structure, and the diameter of the pole post is smaller than that of the boss. Generally, in the assembled DSS, an insulating ceramic tile is provided on the outside of the pole of the graphite electrode, and the insulating ceramic tile is covered on the outside of the pole of the graphite electrode; an insulating cer...

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Problems solved by technology

[0003] The inventors have found that the insulating ceramic tiles and insulating ceramic gaskets provided on the existing graphite electrodes are generally made of high-temperature resistant insulating materials such as alumina, which are easily corroded by high-temperature or reducing substances, resulting in poor insulation performance. fail

Due to the high temperature in the furnace body during the ingot casting process of DSS, and many reducing substances or reducing gases are often produced during the reaction process, the high temperature and reducing substances are likely to cause the insulating ceramic tiles and The insulation performance of the insulating ceramic gasket fails, which causes damage to the graphite electrode and shortens the service life of the graphite electrode; at the same time, the cost of replacing the failed insulating ceramic is high, and affects the production efficiency of the polycrystalline ingot furnace

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