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Preparation method of high performance fused silica crucible for polycrystalline silicon ingot casting

A technology of fused silica and fused silica sand, which is applied in the field of preparation of fused silica crucibles for high-performance polycrystalline silicon ingots, can solve problems such as defects and cracks, and achieve reduced defects and cracks, high safety, and high thermal shock resistance Effect

Inactive Publication Date: 2020-03-27
SINOMA JIANGSU SOLAR ENERGY NEW MATERIALS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The coated fused silica sand will be sintered to form a denser layer of fused silica sand ceramic layer, thereby improving the density and strength of the outer surface of the crucible, but defects and cracks will appear due to shrinkage during the curing process

Method used

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  • Preparation method of high performance fused silica crucible for polycrystalline silicon ingot casting
  • Preparation method of high performance fused silica crucible for polycrystalline silicon ingot casting

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Embodiment Construction

[0028] The specific technical solutions of the present invention are further described below, so that those skilled in the art can further understand the present invention, without limiting their rights.

[0029] A method for preparing a high-performance polysilicon ingot fused silica crucible,

[0030] 1) Prepare fine slurry, which refers to fused silica slurry with a median particle size between 7 and 10 μm. Grind coarse grain fused silica sand (particle size 2~15mm) and fused silica glass frit (irregular shape, size 20~200mm) according to the ratio 1: (0.2~1) and add water, use 1~10t capacity Grind into a fine slurry by a large ball mill. The ball stone materials used for grinding are not limited to alumina and zirconia. The particle size of the ball stone is between 50mm and 150mm, and the water content of the final fine slurry is between 10% and 15%.

[0031] 2) Mix fine slurry and aggregate, add monomer, crosslinking agent and lactic acid during the process. According ...

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Abstract

The invention discloses a preparation method of a high performance fused silica crucible for polycrystalline silicon ingot casting. A certain ratio of shaping sand is used as aggregate, the water andslurry / sand ratio of slurry are reduced, the ratio of coarse materials and medium materials in the aggregate formula is adjusted, the volume density is obviously increased, the rupture strength is improved, at the same time, the crystallization ratio is reduced, and the high temperature creep property of the crucible is enhanced. Through the technical scheme mentioned above, the volume density isimproved by 2 to 8%; the rupture strength is improved by 4 to 15%; the ingot casting time is shortened by 2 to 7 hours for each furnace, an the production efficiency is greatly improved. At the same time, the anti-thermal shock stability and low high temperature creep property of the crucible are guaranteed, and the safety of the crucible is prominently enhanced.

Description

technical field [0001] The invention relates to a production technology of a quartz crucible, in particular to a preparation method of a fused silica crucible for high-performance polysilicon ingot casting. Background technique [0002] In order to meet the increasing undercooling and high safety requirements of ingot manufacturers, the crucible needs to improve thermal shock resistance and high temperature creep strength; in addition, single polysilicon ingot manufacturers pay more and more attention to production efficiency, and the thermal conductivity of the crucible It has gradually become a key indicator, and the thermal conductivity of the crucible can be guaranteed to shorten the ingot casting time within the range allowed by the ingot casting process. [0003] In the prior art, the application number of "A Preparation Method for High-Density Quartz Crucible" is: 201810397839.1 Chinese patent application, which discloses a preparation method for a high-density quartz...

Claims

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Application Information

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IPC IPC(8): C04B35/14C04B35/622C04B35/626C30B28/06C30B29/06
CPCC04B35/14C04B35/622C04B35/62615C04B35/6263C04B35/6264C04B2235/5427C04B2235/5436C04B2235/6022C04B2235/77C04B2235/96C30B28/06C30B29/06
Inventor 曹伟黄蓉帅钟德京习小青张学日赵子豪
Owner SINOMA JIANGSU SOLAR ENERGY NEW MATERIALS
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