Casting mold for rod-shaped silicon material and casting method thereof

Abstract

The invention relates to a casting die and a casting method for a bar-like silicon material and relates to the casting of the silicon material. The casting die for the bar-like silicon material is provided with fasteners, a vacuum container, a cooling tube, a cooling box, a fan and a vibrator; the fasteners are arranged in the vacuum container; the parts, making contact with high temperature silicon fluid, in the fasteners are provided with heat resistant layers; a circle of heater is arranged at the periphery of each fastener in a surrounding mode; heat preservation layers wrap the peripheries of the heaters; the fasteners make contact with the vibrator arranged at the bottom in the vacuum container; an air outlet is formed in the upper part of the vacuum container and is connected with the air inlet of the cooling box by the cooling tube; the air outlet of the cooling box is connected into the vacuum container by the fan. After the casting die for the bar-like material is preheated in vacuum, the molten silicon fluid is poured into the cavity of the casting die for the bar-like silicon material and is vibrated by starting the vibrator, heating is performed after the vibration is finished, annealing is performed after the heating, and finally cooling and discharging are performed to obtain the bar-like silicon material. The cost is low and the production efficiency is high.

Description

Technical field [0001] The invention relates to the casting of silicon materials, in particular to a rod-shaped silicon material casting mold and a casting method thereof. Background technique [0002] With the improvement of human awareness of environmental protection, green energy has received more and more attention. In recent years, people have successively invested in the research and development of green energy. Emerging green energy such as solar cells and lithium-ion batteries have made considerable progress and are gradually entering people's lives. [0003] Silicon material has a wide range of applications in the production of solar cells and lithium-ion batteries. It is an important material for the production and storage of green energy and has attracted people's attention. At present, the research directions of silicon materials include: the purification and crystallization of silicon materials and the production of silicon thin films. [0004] The purification of sili...

AI Technical Summary

Problems solved by technology

[0005] Due to the characteristic that the density of liquid silicon is higher than that of solid silicon when the temperature of the silicon material is near the freezing point, in the process of casting silicon materials, the solidification and expansion of silicon can easily lead to expansion and deformation of the casting mold, resulting in damage. It is necessary to provide a method to overcome this influences

At present, in the casting process of solar polysilicon, directional solidification is mainly used to reduce the influence of silicon, but the crucible used for casting is disposable.

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