Graphite protection board for ingot crucible

Abstract

The invention discloses a graphite protection board for an ingot crucible. According to the graphite protection board for the ingot crucible, four graphite protection boards are sequentially connectedand encircled to form a rectangular space capable of surrounding a crucible; a plurality of vertically arranged threaded holes are formed in right sides of the graphite protection boards, positioningholes with corresponding quantities and positions are formed in left sides of board surfaces, and two graphite protection boards can be connected by enabling bolts to pass through the positioning holes and be matched with the threaded holes; a plurality of horizontally arranged vent holes are formed in tops of the board surfaces of the graphite protection boards and are used for introducing and discharging argon, and the vent holes are not communicated with the sides of the graphite protection boards; anti-breaking grooves that vertically cross with the threaded holes are formed in the boardsurfaces of the graphite protection boards; the anti-breaking grooves completely penetrate through the board surfaces of the graphite protection boards. The graphite protection board disclosed by theinvention is simple in structure, and convenient to assemble and detach, the cost can be reduced, and the impurity removal ability in the ingot casting process can be improved, so that the ingot quality is effectively improved, and the service life of the graphite protection board is prolonged.

Description

technical field [0001] The invention relates to a crucible graphite guard plate for ingot casting, which belongs to the field of polysilicon ingot casting furnace equipment. Background technique [0002] The role of the graphite shield is to protect the quartz crucible inside it from causing production accidents due to softening and collapse at high temperatures during the ingot casting process. The graphite shield is made of isostatic graphite, which is expensive, but due to bumps and aging during use, it is easy to cause damage such as chipping and corner chipping and lose its due function, and even poses a safety hazard. [0003] During the ingot casting process, it is necessary to continuously feed argon gas to the surface of the silicon liquid, and guide the precipitated impurities out through the air flow. In the early days, the closed guard was used, but when used with the cover, there is only a small gap between the cover and the guard, which theoretically does not ...

AI Technical Summary

Problems solved by technology

The closed guard plate was used in the early stage, but when used with the cover plate, there is only a small gap between the cover plate and the guard plate, theoretically, the impurity discharge is not smooth enough, which affects the quality of the ingot.

So there is an open guard plate, which has a larger opening and enough space for miscellaneous removal, but at the same time, a new problem is introduced: the open guard plate is relatively fragile because of the three upper protrusions, and the vulnerability problem is more prominent, and it is also It is easy to cause the lower part of the cover to be deformed without support

At the same time, because the actual quality improvement is not obvious, but the guard plate is more likely to be damaged, from the perspective of cost reduction, it returns to the design of the closed guard plate

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