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Quartz crucible for ingot casting and manufacturing method thereof

A quartz crucible and ingot casting technology, which is applied in the field of preparation of the quartz crucible to achieve the effect of not being easily damaged, reducing oxidation pollution, and reducing the risk of collision

Inactive Publication Date: 2012-07-04
常熟华融太阳能新型材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method makes the silicon nitride coating meet the use requirements to a certain extent, due to the existence of inorganic binders, it cannot be removed from the beginning to the end during the entire ingot casting process, resulting in increased impurities and high oxygen content in the final silicon ingot ( about 5%-10%)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Mix silicon nitride powder with a mass fraction of 40%, polyvinyl chloride with a mass fraction of 1%, and pure water with a mass fraction of 59%, and then heat it to 40°C. Spray the suspension on the surface of the crucible by spraying. The sprayed crucible continued to cure the coating at 80° C. for 1 hour, and then cooled to room temperature to obtain the coating.

Embodiment 2

[0048] Mix silicon nitride powder with a mass fraction of 30%, polyacrylic acid with a mass fraction of 5%, and pure water with a mass fraction of 35%. The good crucible continued to cure the coating at 100° C. for 2 hours, and then cooled to room temperature to obtain the coating.

Embodiment 3

[0050] Prepare silicon nitride slurry, mix silicon nitride powder with a mass fraction of 55%, polyvinyl alcohol with a mass fraction of 10%, and pure water with a mass fraction of 69%, heat it to 40°C, and automatically spray it with a robot The suspension was sprayed on the surface of the crucible, and the sprayed crucible was continued to cure the coating at 80° C. for 1 hour, and then cooled to room temperature to obtain the coating.

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PUM

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Abstract

The invention provides a quartz crucible for ingot casting and a manufacturing method thereof, which relate to the quartz crucible for polycrystalline silicon ingot casting and the manufacturing method. The method includes: (1) preparing silicon nitride slurry: uniformly mixing silicon nitride powder with mass percentage of 30-55%, organic bonder with mass percentage of 1-10%, antioxidant with mass percentage of 0-1% and pure water with mass percentage of 35-69%, and heating to temperature of 40-100 DEG C; and (2) spray coating: spraying suspension on the surface of the crucible by adopting spray coating technology, performing coating curing on the coated crucible for 1-2 hours at temperature of 80-100 DEG C, and cooling the crucible to room temperature. Adding organic bonder can lead surface adsorptivity of the crucible to be better and lead the crucible not to be damaged easily. High-temperature sintering is not required, oxidation pollution of the quartz crucible and the coating can be reduced, and energy consumption can be reduced.

Description

Technical field: [0001] The invention relates to a quartz crucible for polycrystalline silicon ingots, and also relates to a preparation method for the quartz crucible. Background technique: [0002] Quartz ceramic crucible is a container used to load molten polysilicon raw materials in the process of polysilicon ingot casting, mostly square. There are two problems in the manufacture and use of quartz ceramic crucibles. [0003] On the one hand, when the molten polysilicon raw material is loaded, the molten polysilicon will react with the quartz ceramic crucible, that is, silicon and the main component of the quartz ceramic crucible, SiO 2 The reaction produces SiO and oxygen. Oxygen can contaminate the silicon. SiO is volatile and will react with graphite parts in the furnace. Silicon monoxide reacts with graphite to form silicon carbide and carbon monoxide. The carbon monoxide will then react with the molten silicon to form additional volatile silicon monoxide and carb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D1/02B05D3/02B05D7/24C30B28/06C30B29/06
Inventor 张福军杨艳红周佳晖
Owner 常熟华融太阳能新型材料有限公司