Directional solidification furnace with improved crucible cover part

Abstract

The invention discloses a directional solidification furnace, which comprises an upper furnace body, a lower furnace body, a crucible, at least one heater, a crucible holder, a heat insulation component, a breather pipe and a crucible cover part, wherein the lower furnace body is matched with the upper furnace body to form a furnace body space; the crucible is arranged in the furnace body space and constructed to accommodate a feedstock; the at least one heater is used for heating the crucible and melting the feedstock accommodated in the crucible; the crucible holder is used for holding the crucible; the heat insulation component is constructed to longitudinally move relative to the crucible so as to control directional solidification of the feedstock in the crucible; the breather pipe is connected with an external gas source and vertically passes through the heat insulation component; and the crucible cover part is detachably arranged at the bottom of the breather pipe, and the sizeof the crucible cover part is adapted to the size of the top of the crucible so as to cover above the crucible. The directional solidification furnace can ensure that the furnace cavity is not polluted at the same time of realizing increment of the feedstock so as to improve the production efficiency and reduce the cost at the same time of ensuring the quality of a produced billet.

Description

technical field [0001] The present invention relates to production equipment such as monocrystalline or polycrystalline ingots, and more particularly to a directional solidification furnace with an improved crucible lid. Background technique [0002] In existing directional solidification equipment or systems for manufacturing polycrystalline ingots, since the raw materials used to produce polycrystalline ingots (such as polycrystalline silicon ingots, etc.) are block or granular, there are a large number of gaps between the blocks, resulting in the filling of quartz The crucible's solid polycrystalline feedstock is melted and shrinks considerably. However, it is expensive to manufacture polycrystalline ingots by using a directional solidification system, and the charging amount directly determines the production efficiency and cost, so it is necessary to take technical measures to increase the feeding amount. In order to realize multi-charging, it can be considered that wh...

AI Technical Summary

Problems solved by technology

[0006] In view of this, it is necessary to provide a new directional solidification furnace, which can solve the positioning problem of the gas path in the existing directional solidification furnace, and can increase the feeding amount each time while ensuring the crystal quality. Improve the production efficiency of the whole polycrystalline ingot

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