Non-transparent quartz crucible for polysilicon crystallization and manufacturing method thereof

A technology of transparent quartz and manufacturing methods, which is applied in the direction of manufacturing tools, glass manufacturing equipment, chemical instruments and methods, etc., can solve the problems of incapable of large-scale production and application, low effective yield of silicon ingots, unsatisfactory use effects, etc., to achieve Excellent thermal shock stability and burst resistance, low thermal and electrical conductivity, and small linear expansion coefficient

Inactive Publication Date: 2009-01-21
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

[0004] At present, the crucibles used for polysilicon melting and crystallization are all made of high-purity graphite materials in the industry, and their own manufacturing costs are relatively high; moreover, the polysilicon ingots crystallized from graphite crucibles have a high impurity content, and the effective yield of silicon ingots Very low, the use effect is not ideal, and it is not yet suitable for large-scale production and application

Method used

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  • Non-transparent quartz crucible for polysilicon crystallization and manufacturing method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] First, put 40 parts of massive high-purity quartz and 60 parts of powdered high-purity quartz into the granulation equipment for wet granulation. The geometric size of the block material is less than 40 mm, and the particle diameter of the powder material is less than 4 mm. Add water After grinding, the particle size is controlled at 70 μm to 85 μm;

[0031] After the slurry is taken out, it is fully stirred, and the physical and chemical indicators are tested after it is placed for 24 hours. After passing the test, the next process can be carried out; the slurry is poured into the pressure device, and the slurry is injected into the plaster mold with 3bar pressure , grouting in the early stage is supplemented by slight vibration to make the material evenly distributed, the vibration frequency is 30-40 times / min, and the amplitude is 1-2 mm; put it in the mold for 8 hours to make it fully dehydrated and then demould. be very careful;

[0032] After demoulding, put it i...

Embodiment 2

[0035] First, put 50 parts of massive high-purity quartz and 50 parts of powdered high-purity quartz into the granulation equipment for wet granulation. The geometric size of the block material is less than 50 mm, and the particle diameter of the powder material is less than 5 mm. Add water After grinding, the particle size is controlled at 80 μm to 90 μm;

[0036] After the slurry is taken out, it is fully stirred, and after 36 hours, the physical and chemical indicators are tested, and the next process can be carried out after passing the test; the slurry is poured into the pressure device, and the slurry is injected into the plaster mold with 3bar pressure , grouting in the early stage is supplemented by slight vibration, so that the material is evenly distributed, the vibration frequency is 35-40 times / min, and the amplitude is 1-3 mm; put it in the mold for 6 hours, make it fully dehydrated, and then demould. be very careful;

[0037] After demoulding, put it in a dryer ...

Embodiment 3

[0040] First, put 45 parts of massive high-purity quartz and 55 parts of powdered high-purity quartz into the granulation equipment for wet granulation, add water and grind to control the particle size at 75 μm to 95 μm;

[0041] After the slurry is taken out, it is fully stirred, and the physical and chemical indicators are tested after it is placed for 48 hours. After passing the test, the next process can be carried out; the slurry is poured into the pressure device, and the slurry is injected into the plaster mold with 2 bar pressure , grouting in the early stage is supplemented by slight vibration to make the material evenly distributed, the vibration frequency is 30-40 times / min, and the amplitude is 2-3 mm; put it in the mold for 5 hours to make it fully dehydrated and then demould. be very careful;

[0042] After demolding, put it in a dryer for drying, the drying temperature is 190°C, and it has a certain strength after drying;

[0043] Put the dried body into a kiln f...

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Abstract

The invention provides an opaque quartz crucible used in multicrystal silicon crystallization and a method for manufacturing the same. The crucible is of a regular square structure, and the compositions in mass ratio of the crucible are more than 99.7 Wt percent of silicon dioxide, less than 600ppm of aluminum oxide and less than 30ppm of ferric oxide. The method comprises the following steps: firstly, a raw material, i.e. high purity quartz is put into granulation equipment for wet method granulation, the grain size is controlled between 70 and 100mu m; then, slurry is fully stirred and then is fed into a gypsum mould under a pressure of between 2 and 3bar after being deposited for 24 to 48 hours; moreover, early grouting is assisted by slight vibration; the slurry is further settled for 5 to 8 hours, and is demoulded after fully dewatered; the slurry is dried inside a drier; and finally, a blank is put in a kiln for sintering so as to obtain the opaque quartz crucible. The proposal adopts grouting forming by a high-purity quartz material, and the sintered crucible has uniform inner structure; moreover, the crucible has excellent thermal shock stability and cracking resistance, and can meet the technological requirements for manufacturing multicrystal silicon cast ingots.

Description

technical field [0001] The invention relates to a quartz crucible, in particular to an opaque quartz crucible for polysilicon crystallization and a manufacturing method thereof, belonging to the technical field of crystal growth. Background technique [0002] As we all know, the power supply in the world is becoming increasingly tense, and the application of photovoltaic technology can effectively alleviate this situation. Photovoltaic power generation mainly includes single crystal and polycrystalline cell technology. Compared with single crystal, polycrystalline photovoltaic has the advantages of low energy consumption and high efficiency; 6 to 7 times of that, so polycrystalline has been widely used in recent years. [0003] Quartz crucible produced by electric arc method has been used for single crystal silicon drawing. "Quartz Glass" ISBN 978-7-5025-9751-1 published by Chemical Industry Press, its fifth chapter discloses the technology of producing quartz crucible by e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03B20/00C01B33/021
CPCC03B19/066
Inventor 杨艳红
Owner 常熟华融太阳能新型材料有限公司
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