Method for producing quartz glass crucible by using electric arc rotary hot melting method

Abstract

The invention discloses a method for producing a quartz glass crucible by using an electric arc rotary hot melting method. On the basis of a traditional vacuum arc method, a rotary die is additionally arranged for melting a crucible matrix; and the produced crucible blank is slowly cooled in a combustion atmosphere and bubbles and other structural defects inside a crucible are controlled, and thereby the construction strength of the crucible inner wall is improved and the aims of preventing a chemical reaction between a silicon material and a quartz material and improving the purity of a monocrystal silicon product are achieved. According to the method disclosed by the invention, hydrogen gas is sprayed on the just produced quartz glass crucible in rotary motion and high-temperature state and quickness and uniformity in cooling are realized; and the method is especially suitable for producing the quartz glass crucible with large caliber.

Description

technical field [0001] The invention relates to the field of solar photovoltaics, in particular to a method for manufacturing a quartz glass crucible by an arc rotary thermal fusion method. Background technique [0002] In recent years, as the proportion of monocrystalline silicon products in the solar photovoltaic field continues to increase, the demand for high-purity monocrystalline silicon is increasing, and the purity requirements for the quartz glass crucible used to prepare pure monocrystalline silicon are also increasing. improve. [0003] The quartz glass crucible made by the traditional vacuum arc method will generate a certain number of bubbles of different sizes in the transparent layer due to rapid cooling, making the inner surface of the crucible uneven, increasing the contact surface between the silicon material and the quartz material, and aggravating the deterioration of the silicon material. The chemical reaction with the quartz material will pollute the p...

AI Technical Summary

Problems solved by technology

[0003] The quartz glass crucible made by the traditional vacuum arc method will generate a certain number of bubbles of different sizes in the transparent layer due to rapid cooling, making the inner surface of the crucible uneven, increasing the contact surface between the silicon material and the quartz material, and aggravating the deterioration of the silicon material. The chemical reaction with quartz materials will pollute the produced monocrystalline silicon products, which is not conducive to the preparation of high-purity monocrystalline silicon products for solar photovoltaics, and will also seriously affect the yield of monocrystalline silicon production