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Preparation method for quartz crucible with ultra-pure coating

A production method and technology of quartz crucibles, which are applied in the field of production of ultra-high-purity coated quartz crucibles, can solve problems such as low carrier life of crystal ingots, high impurity content, and ultra-high-purity quartz sand that does not meet production requirements, so as to achieve the improvement of silicon Ingot quality and cost reduction effects

Active Publication Date: 2017-07-28
杭州大和江东新材料科技有限公司
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  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Quartz square crucible is used for polysilicon ingot as a carrier container in high-purity solar grade (6N, 99.9999%) polysilicon raw material high-temperature melting process, the traditional quartz square crucible material purity is usually 3N (99.9%), although the inner surface of the crucible is sprayed A layer of high-purity silicon nitride coating is used to block polysilicon and quartz materials, but the impurities carried by the crucible itself will precipitate and penetrate into the polysilicon material at high temperature, and gather on the four sides of the crystal ingot after the segregation effect and the bottom position, resulting in high impurity content in these areas, which are red in the ingot scan image, see attached figure 1
In this part of the area with high impurity content, the minority carrier lifetime of the crystal ingot is low, and the conversion efficiency after being made into a cell is very low, so it is usually cut off as waste
The price of ultra-high-purity quartz sand is very expensive. If it is used to make the entire crucible, the cost will be very high, and it will also increase the cost of solar power generation. Therefore, the ultra-high-purity quartz sand integral crucible does not meet the actual production needs

Method used

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  • Preparation method for quartz crucible with ultra-pure coating
  • Preparation method for quartz crucible with ultra-pure coating
  • Preparation method for quartz crucible with ultra-pure coating

Examples

Experimental program
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Embodiment approach

[0021] A method for making an ultra-high-purity coated quartz crucible, comprising the following steps:

[0022] (1) Select ultra-high-purity quartz sand with a particle size of 0.2mm-0.6mm (purity ≥ 99.9999%), add deionized water with a weight of 10%-40% of the ultra-high-purity quartz sand, and put it into a ball mill for ball milling until the slurry particle size is 6μm-15μm, made into slurry. The ultra-high-purity quartz sand with a particle size of 0.2mm-0.6mm is composed of particles with different particle sizes as follows: 10%-35% of particles with a particle size greater than 500 μm, 50%-70% of particles with a particle size of 300-500 μm, 10%-35% of the particle size is less than 300μm.

[0023] (2) The slurry prepared in step (1), ultra-high-purity quartz sand and silica sol with a particle size of 0.15mm-0.05mm are mixed according to the ratio of weight ratio=(1-4):(1-3):1, fully After stirring for 0.5-2 hours, an ultra-high-purity slurry is made. The ultra-hig...

specific preparation example 1

[0027] A method for making an ultra-high-purity coated quartz crucible, comprising the following steps:

[0028] (1) 10kg of ultra-high-purity quartz sand (its particle size by weight percentage is composed of: 20% greater than 500 μm, 50% of 300 μm-500 μm, and 30% less than 300 μm) 10kg, add 2kg of deionized water, put In a ball mill barrel with a capacity of 20L, ball mill for 5 hours, and the particle size of the slurry after ball milling is in the range of 6 μm-15 μm.

[0029] (2) 400g of ball-milled slurry, ultra-high-purity quartz sand (25% greater than 106 μm, 40% of 106 μm-75 μm, 35% less than 75 μm) 300g, silica sol (commercially available, solid content 25%) 100g After mixing and fully stirring for 2 hours, an ultra-high-purity slurry is made.

[0030] (3) Coat the inner surface of the square quartz crucible with the ultra-high-purity slurry prepared in step (2) by spraying. Dry in the furnace for 2 hours to obtain an ultra-high-purity coated quartz crucible. Afte...

specific preparation example 2

[0032] A method for making an ultra-high-purity coated quartz crucible, comprising the following steps:

[0033] (1) 10kg of ultra-high-purity quartz sand (its particle size by weight percentage is composed of: 10% greater than 500 μm, 70% of 300 μm-500 μm, 20% less than 300 μm) 10kg, add 2kg of deionized water, put In a ball mill barrel with a capacity of 20L, ball mill for 3.5 hours, and the particle size of the slurry after ball milling is in the range of 6 μm-15 μm.

[0034] (2) 100g of slurry after ball milling, 100g of ultra-high-purity quartz sand (50% greater than 106 μm, 30% of 106 μm-75 μm, 20% less than 75 μm), 100 g of silica sol, and fully stirred for 0.5 hours, prepared into ultra-high-purity slurry.

[0035] (3) Apply the ultra-high-purity slurry prepared in step (2) to the inner surface of the square quartz crucible by brushing, the coating thickness is 0.3mm, and after natural drying at room temperature for 1 hour, place it in a room with a temperature of 100...

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Abstract

The invention discloses a preparation method for a quartz crucible with an ultra-pure coating. According to the preparation method, ultra-pure quartz sand is used as a raw material and undergoes ball milling and batch mixing under stirring so as to prepare slurry, and the ultra-pure coating is prepared on the quartz crucible by using a tape casting, spraying or brush coating process. Thus, the content of impurities infiltrating into polysilicon ingots from the crucible is lowered; the quality of the polysilicon ingots is improved; and cost for the polysilicon ingots is reduced.

Description

technical field [0001] The invention relates to a manufacturing method of a quartz crucible, in particular to a manufacturing method of an ultra-high-purity coated quartz crucible. Background technique [0002] Quartz square crucible is used for polysilicon ingot as a carrier container in high-purity solar grade (6N, 99.9999%) polysilicon raw material high-temperature melting process, the traditional quartz square crucible material purity is usually 3N (99.9%), although the inner surface of the crucible is sprayed A layer of high-purity silicon nitride coating is used to block polysilicon and quartz materials, but the impurities carried by the crucible itself will precipitate and penetrate into the polysilicon material at high temperature, and gather on the four sides of the crystal ingot after the segregation effect and the bottom position, resulting in high impurity content in these areas, which are red in the ingot scan image, see attached figure 1 . In this part of the...

Claims

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Application Information

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IPC IPC(8): C03C17/23
CPCC03C17/23
Inventor 周勇李卫川上泉寺西久広占克文
Owner 杭州大和江东新材料科技有限公司
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