Preparation method for spraying-free crucible

A non-spraying, crucible technology, applied in chemical instruments and methods, devices for coating liquid on surfaces, coatings, etc., can solve the problem of reducing inefficient leakage current slice yield, silicon nitride particles falling off, ingot dislocation density High problems, to achieve the effect of less silicon nitride shedding, improved viscosity, and lower drying temperature

Active Publication Date: 2020-04-21
浙江润优新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the silicon nitride coating of the ingot crucible is mainly prepared by spraying. Although it can effectively prevent the ingot from sticking to the crucible, due to the loose spray coating, silicon nitride particles are easy to fall off and enter the silicon ingot during the ingot casting process. This leads to high dislocation density and high hard point in the ingot, which has a great negative impact on the improvement of ingot efficiency, the reduction of low-efficiency leakage and the improvement of slicing yield.
Therefore, how to develop a spray-free method to prepare crucible coatings to overcome the problems of loose silicon nitride coatings, high dislocation density in ingots, and high hard points

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A method for preparing a spray-free crucible, the specific operation comprising the following steps:

[0023] S1: 900g of silicon nitride, 600g of alcohol-based silica sol and 65g of ceramic glue are prepared into a silicon nitride coating solution; wherein, the particle size of the silicon nitride is D 50 2.0 mu m, total metal impurity content ≤ 3ppm, and β The phase mass percentage is 50%; the alcohol-based silica sol contains nano-SiO 2 The mass fraction of particles is 20%, the mass fraction of ethanol is 60%, the mass fraction of pure water is 20%, and the metal impurity content is ≤ 1ppm; the ceramic glue is polyethylene with a mass fraction of 3%, a polymerization degree ≥ 8000, and a metal impurity content ≤ 5ppm Alcohol aqueous solution; S2: First brush each inner surface of the crucible with the silicon nitride coating solution with the above-mentioned silicon nitride coating solution, wherein, the amount of the silicon nitride coating solution for brushing ...

Embodiment 2

[0025] A method for preparing a spray-free crucible, the specific operation comprising the following steps:

[0026] S1: 900g of silicon nitride, 450g of alcohol-based silica sol, and 90g of ceramic glue are prepared into a silicon nitride coating solution; wherein, the particle size of the silicon nitride is D 50 2.4 mu m, total metal impurity content ≤ 3ppm, and β The phase mass percentage is 70%; the alcohol-based silica sol contains nano-SiO 2 The mass fraction of particles is 25%, the mass fraction of ethanol is 65%, the mass fraction of pure water is 10%, and the content of metal impurities is ≤1ppm; the ceramic glue is polyethylene with a mass fraction of 8%, a degree of polymerization ≥8000, and a content of metal impurities ≤5ppm Alcohol aqueous solution; S2: Brush each inner surface of the crucible with the silicon nitride coating solution once with the above-mentioned silicon nitride coating solution, wherein, the amount of the silicon nitride coating solution for...

Embodiment 3

[0028] A method for preparing a spray-free crucible, the specific operation comprising the following steps:

[0029] S1: 900g of silicon nitride, 450g of alcohol-based silica sol and 65g of ceramic glue are prepared into a silicon nitride coating solution; wherein, the particle size of the silicon nitride is D 50 2.2 mu m, total metal impurity content ≤ 3ppm, and β The phase mass percentage is 60%; the alcohol-based silica sol contains nano-SiO 2 The mass fraction of particles is 25%, the mass fraction of ethanol is 65%, the mass fraction of pure water is 10%, and the metal impurity content is ≤ 1ppm; the ceramic glue is polyethylene with a mass fraction of 6%, a polymerization degree ≥ 8000, and a metal impurity content ≤ 5ppm Alcohol aqueous solution; S2: brush each inner surface of the crucible with the silicon nitride coating solution once with the above-mentioned silicon nitride coating solution, wherein, the amount of the silicon nitride coating solution for brushing i...

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Abstract

The invention provides a preparation method for a spraying-free crucible. The preparation method comprises the following steps: S1, preparing a silicon nitride coating solution from silicon nitride, an alcohol-based silica sol, a ceramic adhesive and pure water according to a certain mass ratio, wherein the mass ratio of the silicon nitride to the alcohol-based silica sol is (1.5-2): 1, and the mass ratio of the silicon nitride to the ceramic adhesive is (14-10): 1, and the mass ratio of the silicon nitride to the water is 1: (1-3); and S2, brushing the silicon nitride coating solution onto the inner surface of a crucible, carrying out drying, then removing floating dust on the surface of the crucible, putting a drying agent, and carrying out packaging. The silicon nitride coating preparedaccording to a formula provided by the invention is good in compactness; spraying is replaced with a secondary brush coating preparation process, so the silicon nitride coating is more compact in strength, low in proportion of oxygen immersed into a silicon ingot and less in silicon nitride falling off; the effects of low hardness point and low-oxygen ingot casting are achieved; and the preparation method has the advantages of easy and convenient operation and high industrialization.

Description

technical field [0001] The invention belongs to the technical field of preparing a crucible for polycrystalline silicon ingots, and in particular relates to a method for preparing a spray-free crucible. Background technique [0002] The preparation method of polycrystalline silicon ingot is mainly carried out by using the directional solidification system provided by GT Solar, and the method usually includes the steps of heating, melting, crystal growth, annealing and cooling. During the solidification and crystal growth process, the temperature of the top and the opening of the side insulation cover are controlled so that the molten silicon liquid can obtain sufficient supercooling at the bottom of the crucible to solidify and crystallize. At present, the silicon nitride coating of the ingot crucible is mainly prepared by spraying. Although it can effectively prevent the ingot from sticking to the crucible, due to the loose spray coating, silicon nitride particles are eas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D1/00C09D7/61B05D1/28C30B28/06C30B29/06
CPCB05D1/28B05D2259/00B05D2451/00B05D2601/20C09D1/00C30B28/06C30B29/06C09D7/61
Inventor 季勇升刘明权
Owner 浙江润优新材料科技有限公司
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