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Quartz-ceramic crucible with combined structure and preparation method thereof

A technology of quartz ceramics and composite structures, applied in the field of quartz ceramic crucibles, can solve problems such as increased hard points, high reactivity, and reduced yield of silicon ingots, so as to reduce impurity content and oxygen content, reduce production costs, and reduce The effect of red fringing

Inactive Publication Date: 2019-01-25
江西中材新材料有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the high-purity quartz barrier layer has low density, high reactivity, and poor adhesion to the silicon nitride coating, resulting in a red edge of 5mm-10mm in the silicon ingot, and an increase of 2ppm-4ppm in the oxygen content of the silicon ingot. There are shortcomings of silicon nitride lodging, silicon nitride impurities and hard spots in silicon ingots increase significantly, which reduces the yield of silicon ingots, increases the initial light-induced attenuation in battery components, and significantly reduces conversion efficiency. Cutting yield drops significantly during cutting

Method used

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  • Quartz-ceramic crucible with combined structure and preparation method thereof
  • Quartz-ceramic crucible with combined structure and preparation method thereof
  • Quartz-ceramic crucible with combined structure and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0094] A method for preparing a composite structure quartz ceramic crucible, comprising:

[0095] Take high-purity quartz sand with a purity of 99.99% and a particle size of less than 5 mm, dissolve it in water and add zirconia balls as grinding media to obtain a quartz slurry with a solid content of 91%. Add acrylamide, N,N-methylenebisacrylamide and ammonium persulfate into the above-mentioned quartz slurry, and mix evenly to obtain a mixed slurry.

[0096] Take the crucible body, place the tempered glass inner mold in the inner cavity of the crucible body, and form a mold cavity between the inner mold and the crucible body. The above-mentioned mixed slurry is injected into the mold cavity by the pouring process, and the inner mold is removed after solidifying in a water bath at 60°C for 45 minutes, so that a layer of high-purity quartz layer is attached to the inner surface of the crucible body, and the compound is obtained after rough sandblasting. Structural quartz ceram...

Embodiment 2

[0098] A method for preparing a composite structure quartz ceramic crucible, comprising:

[0099] Take high-purity quartz sand with a purity of 99.995%, which contains coarse aggregate high-purity quartz sand (with a particle size of 0.5mm-5mm) and fine powder high-purity quartz sand (with a particle size of less than 0.5mm) in a mass ratio of 1:2 ), after being dissolved in water, zirconia balls and silicon nitride balls were added as grinding media, and ground in a vertical ball mill to obtain quartz slurry with a solid content of 94%. Add methacrylamide, diisocyanate, azobisisobutyronitrile, azobisisoheptanonitrile, N,N,N,N-tetramethylethylenediamine and polyacrylate to the above quartz slurry, mix well Obtain mixed slurry, wherein, the mass proportion of methacrylamide is 0.5%, the mass proportion of diisocyanate is 3% of methacrylamide quality, the mass proportion of azobisisobutyronitrile is 0.5%, even The mass proportion of nitrogen diisoheptanonitrile is 0.5%, the mas...

Embodiment 3

[0102] A method for preparing a composite structure quartz ceramic crucible, comprising:

[0103] Take high-purity quartz sand with a purity of 99.9%, add water, grind it fully in a ball mill or a mixer, add organic polymer monomers, cross-linking agents and initiators, and prepare a crucible body in a crucible mold by using a coagulation injection process.

[0104] Take high-purity quartz sand with a purity of 99.999%, which consists of the following particles with different particle sizes in proportion by mass: 25% high-purity quartz sand with a particle size greater than 2mm and no more than 5mm, 10% high-purity quartz sand with a particle size of 1mm-2mm Quartz sand, 15% high-purity quartz sand with a particle size not less than 0.5mm and less than 1mm, 5% high-purity quartz sand with a particle size greater than 0.1mm and less than 0.5mm, 25% high-purity quartz sand with a particle size of 0.05mm-0.1mm Sand, 20% high-purity quartz sand with a particle size of less than 0....

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Abstract

The invention provides a quartz-ceramic crucible with a combined structure. The quartz-ceramic crucible with the combined structure comprises a crucible body and a high-purity quartz layer arranged onthe whole or part of inner surface of the crucible body. The high-purity quartz layer is made of high-purity quartz sand with the purity higher than 99.99% and the grain size being no larger than 5 mm, wherein the particles with the grain size being larger than 2 mm in the high-purity quartz sand accounts for 10-35% by mass. The impurity content and the oxygen content in a silicon ingot can be reduced when the quartz-ceramic crucible with the combined structure is subjected to polycrystalline silicon ingot casting, the phenomenon of red edge of the silicon ingot can be relieved, and the polycrystalline silicon ingot with the high quality can be obtained.

Description

technical field [0001] The invention relates to the technical field of quartz ceramic crucibles, in particular to a composite structure quartz ceramic crucible and a preparation method thereof. Background technique [0002] Quartz ceramic crucible is a container for loading polysilicon raw materials during polysilicon ingot casting, and obtaining polysilicon ingots through heating, melting, crystal growth, annealing, and cooling stages. Quartz ceramic crucibles are generally made of quartz sand with a purity of 99.9%. Although the inner wall of the quartz ceramic crucible is isolated by a silicon nitride coating, a large amount of impurities still penetrate into the silicon ingot during ingot casting, especially iron and copper elements. Wait. The high-purity quartz ceramic crucible made of high-purity quartz sand can effectively improve the above problems, but the cost of high-purity quartz sand is about 10 times that of ordinary quartz sand, and the production cost is too...

Claims

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Application Information

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IPC IPC(8): C30B28/06C30B29/06C04B35/14C04B35/622
CPCC04B35/14C04B35/622C30B28/06C30B29/06
Inventor 任丽敏刘兵吴纯钟德京黄秀秀彭也庆贾建广
Owner 江西中材新材料有限公司
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