Novel high-thermal-conductivity composite crucible for polycrystalline silicon ingot casting and preparation method of composite crucible
A compound crucible and polysilicon technology, applied in the field of new polycrystalline ingot composite crucible and its preparation, new polycrystalline silicon ingot high thermal conductivity composite crucible and its preparation field, can solve crystal silicon or crucible cracking, overflow and other problems, Achieve the effect of reducing overflow rate, improving quality and light weight
Pending Publication Date: 2021-06-29
YANTAI HEJING CERAMIC NEW MATERIALS
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Problems solved by technology
Due to the different thermal expansion coefficients of the two materials, if the silicon material is tightly bonded to the crucible wall, it is likely to cause crystalline silicon or crucible rupture and overflow when the crystal cools
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[0024] A method for preparing a novel high thermal conductivity composite crucible for polycrystalline silicon ingots, comprising the following steps:
[0025] (1) Preparation of graphene-silicon dioxide composite material: Graphene oxide is dissolved in water and ultrasonically dispersed to obtain graphene oxide aqueous solution, the concentration of the graphene oxide aqueous solution is 1mg / ml, and then according to toluene and graphene oxide aqueous solution Add toluene to emulsify at a mass ratio of 1:2 to obtain a graphene oxide emulsion; then add monomeric siloxane to the graphene oxide emulsion at a ratio of 50:1 according to the ratio of monomeric siloxane to graphene oxide , and then use ammonia water to adjust the pH=9 value and then stir, carry out emulsion polymerization for 6 hours, wash and filter after the reaction to obtain a graphene-silicon dioxide composite material;
[0026] (2) Preparation of the quartz ceramic crucible: the crucible body 1 is prepared by...
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Abstract
The invention relates to a novel high-thermal-conductivity composite crucible for polycrystalline silicon ingot casting and a preparation method of the composite crucible, and belongs to the technical field of crucibles for polycrystalline silicon ingot casting. The novel high-thermal-conductivity composite crucible comprises a crucible body, the crucible body is of a cavity structure with an opening in the upper end, and a graphene-silicon dioxide composite material layer is laid at the bottom of an inner cavity of the crucible body; and a quartz ceramic structure layer is laid on the graphene-silicon dioxide composite material layer. According to the novel high-thermal-conductivity composite crucible for polycrystalline silicon ingot casting and the preparation method of the novel high-thermal-conductivity composite crucible, the graphene-silicon dioxide composite material layer is added into the crucible, so that the mechanical property and the thermal property of the material can be effectively enhanced, and the novel composite crucible has relatively high strength and also has very good toughness. The overflow rate of the crucible can be effectively reduced, meanwhile, the energy consumption in the ingot casting process can be reduced, the quality of polycrystalline silicon crystals is improved, and market requirements are met.
Description
technical field [0001] The invention relates to a novel composite crucible for polycrystalline ingot casting and a preparation method thereof, in particular to a novel high thermal conductivity composite crucible for polycrystalline silicon ingot casting and a preparation method thereof, belonging to the technical field of polycrystalline silicon ingot casting crucibles. Background technique [0002] In the preparation process of polycrystalline silicon ingot, quartz ceramic crucible is an important product that must be used in the stage of polycrystalline silicon ingot casting. Silicon material is melted in the crucible, crystal grows, annealed and cooled, and cast into polycrystalline silicon ingot. The silicon ingot is cut into silicon chips according to the technical requirements. It becomes the base material for the manufacture of solar cells. [0003] At present, the quartz ceramic crucible is mainly prepared into a green body by slip casting, and then sintered at abou...
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IPC IPC(8): C03B20/00C03B19/02C03C3/06C03C17/34C30B28/06C30B29/06
CPCC03B20/00C03B19/025C03C3/06C03C17/3411C30B28/06C30B29/06C03C2218/114C03C2218/11
Inventor 李健谢炎高源
Owner YANTAI HEJING CERAMIC NEW MATERIALS