Method for preparing silicon nitride/silicon oxide composite crucible

Abstract

The invention discloses a method for preparing a silicon nitride / silicon oxide composite crucible, relates to a method for preparing a composite crucible, and aims at solving the technical problems that the existing crucible of which the heat conductivity at the bottom is higher than that of the lateral wall is high in production cost and low in production success rate. The method for preparing the silicon nitride / silicon oxide composite crucible disclosed by the invention comprises the following steps: pulping, casting, degerming and sintering at a high temperature. By adopting the silicon nitride / silicon oxide composite crucible disclosed by the invention, the heating efficiency and the cooling efficiency can be improved, and the directional solidification effect of silicon melt is greatly improved. Thus, the growth quality of the silicon crystal is improved, and the cost of photovoltaic power generation of the crystal can be reduced. The method is mainly applied to directional solidification growth of polycrystalline silicon.

Description

technical field [0001] The invention relates to a preparation method of a composite crucible. Background technique [0002] During the crystal growth process, the crucible loaded with the crystal not only plays the role of bearing, but also needs to effectively export the heat generated by the crystallization. Therefore, the thermal and mechanical properties of the crucible play an important role in the crystal growth. Among various crystal growth methods, the solid-liquid interface of the crystal in the Kyropoulos method and the pulling method advances from the top to the bottom; while in the heat exchange method and the crucible descent method, the solid-liquid interface advances from the bottom to the top. Most of the heat is conducted from the bottom of the crucible, so the nature of the crucible is particularly important. Various traditional crystals, such as silicon ingots, sapphire, and calcium fluoride, can be grown in large sizes by heat exchange. Low-cost product...

AI Technical Summary

Problems solved by technology

[0007] Appolon solar has designed a new type of crucible structure, which makes the thermal conductivity of the bottom and side parts very different. The bottom part is made of transparent crystalline quartz glass, while the side part is made of non-transparent fused silica. Slurry or gel injection molding, although this scheme achieves the design effect, the cost of this crucible is high and the production success rate is low

Images