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Preparation method for ceramic crucible sintering-free coating for polysilicon ingot

A ceramic crucible and polysilicon technology, which is applied in the field of solar polysilicon ingot casting, can solve the problems of polysilicon ingot manufacturers such as increased ingot cost, increased manual operation process, poor coating adhesion, etc., to increase effective utilization and reduce production and equipment cost, the effect of not easy to fall off

Inactive Publication Date: 2013-01-02
LIGHTWAY GREEN NEW ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Long-term high-temperature sintering is a necessary process in this process. The coating that has not been sintered at high temperature is easy to fall off and foam, which will cause sticking and cracking of the polysilicon ingot.
Long-term high-temperature sintering requires additional high-temperature sintering equipment on the one hand; on the other hand, it consumes a lot of electric energy; on the other hand, it also needs to increase the manual operation process
As a result, the cost of ingot casting for polysilicon ingot manufacturers is greatly increased
At the same time, even the sintered coating has poor adhesion, is easy to fall off, foams, and is more likely to cause silicon ingots to stick to the crucible and crack.

Method used

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  • Preparation method for ceramic crucible sintering-free coating for polysilicon ingot
  • Preparation method for ceramic crucible sintering-free coating for polysilicon ingot

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1, preparation of non-sintering coating of ceramic crucible for polysilicon ingot:

[0026] (1) Preparation of the suspension: it is made of the following materials, calculated by weight percentage, 15% silicon nitride, 80% deionized water and 5% polyvinylpyrrolidone PVP. Pour the amount of deionized water into the mixer, then slowly add the amount of silicon nitride into the deionized water, stir rapidly for 15 minutes and then stir slowly for 15 minutes, then add the amount of polyethylene Pyrrolidone PVP was placed in a stirrer and stirred for 20 minutes to make the suspension uniform and ready for use.

[0027] (2) Preparation of coating: heat the crucible on a rotary heater, spray the above-mentioned suspension after drying the crucible. When spraying, the temperature of the crucible is controlled at 50°C to prevent the coating from falling off or foaming. The spraying distance between the spray gun and the inner wall of the crucible is controlled withi...

Embodiment 2

[0028] Embodiment 2, preparation of non-sintering coating of ceramic crucible for polysilicon ingot:

[0029] (1) Preparation of the suspension: it is made of the following materials, calculated by weight percentage, 18% silicon nitride, 79.5% deionized water and 2.5% polyvinylpyrrolidone PVP. Pour the amount of deionized water into the mixer, then slowly add the amount of silicon nitride into the deionized water, stir rapidly for 15 minutes and then stir slowly for 15 minutes, then add the amount of polyethylene Pyrrolidone PVP was placed in a stirrer and stirred for 15 minutes to make the suspension uniform and ready for use.

[0030] (2) Preparation of coating: heat the crucible on a rotary heater, spray the above-mentioned suspension after drying the crucible. When spraying, the temperature of the crucible is controlled at 60°C, and the spraying distance between the spray gun and the inner wall of the crucible is controlled between 30cm. During the spraying process, try t...

Embodiment 3

[0031] Embodiment 3, preparation of non-sintering coating of ceramic crucible for polysilicon ingot:

[0032] (1) Preparation of the suspension: it is made of the following materials, calculated by weight percentage, 20% silicon nitride, 78% deionized water and 2% polyvinylpyrrolidone PVP. Pour the amount of deionized water into the mixer, then slowly add the amount of silicon nitride into the deionized water, stir rapidly for 15 minutes and then stir slowly for 15 minutes, then add the amount of polyethylene Pyrrolidone PVP was placed in a stirrer and stirred for 16 minutes to make the suspension uniform and ready for use.

[0033] (2) Preparation of coating: heat the crucible on a rotary heater, spray the above-mentioned suspension after drying the crucible. When spraying, the temperature of the crucible is controlled at 70°C, and the spraying distance between the spray gun and the inner wall of the crucible is controlled at 28cm. During the spraying process, try to keep th...

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Abstract

The invention discloses a preparation method for a ceramic crucible sintering-free coating for a polysilicon ingot. The method includes: (1), preparation of turbid liquid made of 15-25% of silicon nitride, 70-80% of deionized water and 1-5% of polyvinyl pyrrolidone (PVP); namely pouring the deionized water into a stirrer, slowly adding the silicon nitride into the deionized water, stirring, placing the PVP into the stirrer for stirring for 15-20 minutes to enable the turbid liquid to be uniform; and (2), preparation of the coating, namely, spraying the stirred turbid liquid on an inner wall of the crucible, airing the crucible after spraying under the normal temperature or placing the crucible on a rotary heater for heat preservation for 0.5-2 hours at the temperature of 70 DEG C to 100 DEG C. The silicon nitride coating formed by the method is high in adhesive force with the inner wall of the crucible and low in probability of shedding and foaming, so that finished product ratio of the polysilicon ingot is improved, ingot cost is lowered, and production efficiency is improved.

Description

technical field [0001] The invention belongs to the field of solar polysilicon ingots, and relates to a method for preparing a non-sintering coating of a ceramic crucible for polysilicon ingots. Background technique [0002] According to the Solarbuzz report in August 2011, 55% of the total installed capacity of end users is based on polysilicon wafers, indicating that polysilicon solar cells have already occupied more than half of the photovoltaic market. Compared with monocrystalline silicon wafers, although the cell conversion efficiency of polycrystalline silicon wafers is relatively low, its production cost is much lower than that of monocrystalline silicon wafers. Considering the cost and benefits, most end users will choose polycrystalline silicon solar energy with lower cost Battery. [0003] A very important link in the manufacturing process of polysilicon wafers is polysilicon ingot casting. The polysilicon ingot casting process is to put the irregular polysilico...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/85
Inventor 刘晓兵吴红霞贾娇娇金浩
Owner LIGHTWAY GREEN NEW ENERGY