Crucible for polysilicon ingot casting, coating structure of crucible and coating preparation method

A crucible coating and polysilicon technology, which is applied to the crucible for polysilicon ingot casting, its coating structure and coating preparation, can solve the problems of sticky crucible, easy peeling of coating, weak bonding force, etc., and reduce sticking pot , not easy to fall off, strong binding effect

Inactive Publication Date: 2014-10-22
JIANGXI SAI WEI LDK SOLAR HI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the silicon nitride aqueous solution is directly sprayed on the inner wall of the ceramic crucible by a spraying process, and the bonding force between the silicon nitride coating particles and between the coating and the crucible is very weak, so that the coating is easily removed from the surface of the crucible during the ingot casting process. Peeling, especially at the gas-solid-liquid three-phase interface during ingot casting, the coating is more likely to peel off, resulting in sticking

Method used

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  • Crucible for polysilicon ingot casting, coating structure of crucible and coating preparation method
  • Crucible for polysilicon ingot casting, coating structure of crucible and coating preparation method
  • Crucible for polysilicon ingot casting, coating structure of crucible and coating preparation method

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Embodiment 1

[0107] combine as figure 1 Process flow chart for the preparation of crucible coatings for polysilicon ingots shown, figure 2 The cross-sectional view of the crucible for polysilicon ingot casting and image 3 of figure 2In the partially enlarged schematic diagram of part A, this embodiment provides a coating preparation method for a crucible for polysilicon ingots, including the following steps:

[0108] 1) Take a cuboid crucible with a model size of 700mm×700mm×480mm for use, which includes a side wall 10 (if the crucible is not clean enough, you can first place the crucible to be brushed on the rotary table to blow away the sundries in the crucible);

[0109] 2) Silicon nitride (Si 3 N 4 ), silica sol, and pure water are mixed and poured into a measuring cup according to the weight ratio of 3:1:5. The amount of silicon nitride in each crucible is 60g, and stirred with a mixer for 10 minutes to make it evenly mixed to obtain the first coating combination wherein, the...

Embodiment 2

[0116] This embodiment provides a coating preparation method for a crucible for polysilicon ingots, comprising the following steps:

[0117] 1) Take a cuboid crucible with a model size of 840mm×840mm×480mm for use, which includes side walls 10 (if the crucible is not clean enough, you can first place the crucible to be brushed on the rotary table to blow away the sundries in the crucible);

[0118] 2) Silicon nitride (Si 3 N 4 ), polyvinyl alcohol, and absolute ethanol are mixed and poured into a measuring cup according to a weight ratio of 4:1:5. The amount of silicon nitride in each crucible is 80g, and stirred with a mixer for 15 minutes to make it evenly mixed to obtain the first coating Layer composition, wherein the silicon nitride is silicon nitride particles with a particle size of 50um, which is a product produced by Japan UBE Company, wherein the nitrogen content is >38wt%, and the oxygen content is <2.0wt%;

[0119] 3) Take off the measuring cup after stirring, a...

Embodiment 3

[0126] This embodiment provides a coating preparation method for a crucible for polysilicon ingots, comprising the following steps:

[0127] 1) Take a cuboid crucible with a model size of 1040mm×1040mm×480mm for use, which includes a side wall 10 (if the crucible is not clean enough, you can first place the crucible to be brushed on the rotary table to blow away the sundries in the crucible);

[0128] 2) Silicon nitride (Si 3 N 4 ), polyvinylpyrrolidone, and isopropanol were mixed and poured into a measuring cup according to a weight ratio of 5:1:5. The amount of silicon nitride in each crucible was 100g, and stirred with a mixer for 20 minutes to make it evenly mixed to obtain the first coating Layer composition, wherein the silicon nitride is silicon nitride particles with a particle size of 50um, which is a product produced by Starck Company in Germany, wherein the nitrogen content is >38wt%, and the oxygen content is <2.0wt%;

[0129] 3) Take off the measuring cup after...

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Abstract

The invention provides a crucible for polysilicon ingot casting, a coating structure of the crucible and a coating preparation method. The coating structure of the crucible for polysilicon ingot casting comprises a first coating arranged on the inner side wall of the crucible and a second coating arranged on the first coating. The first coating is formed from a first coating composition by brush coating. The first coating composition comprises silicon nitride and a solvent. The second coating is formed from a second coating composition by spray coating. The second coating composition comprises silicon nitride and a solvent. The coating structure of the crucible for polysilicon ingot casting has uniform thickness, does not crack easily, has high bonding force to the inner wall of the quartz ceramic crucible, and strong bonding force between silicon nitride particles, does not spall easily in an ingot casting technology and has a low rate of adhesion to the crucible.

Description

technical field [0001] The invention relates to the technical field of polysilicon production equipment, in particular to a crucible for polysilicon ingot casting, its coating structure and coating preparation method. Background technique [0002] In the process of preparing polysilicon ingots, quartz ceramic crucibles are an essential container. Silicon materials are melted in the crucibles, crystals grow, annealed and cooled, and cast into polysilicon ingots. At present, the polycrystalline ingot is mainly sprayed with a layer of silicon nitride coating on the inner wall of the ceramic quartz crucible to prevent the reaction between the silicon liquid and the crucible. In this way, the silicon ingot and the crucible can be separated. However, the silicon nitride aqueous solution is directly sprayed on the inner wall of the ceramic crucible by a spraying process, and the bonding force between the silicon nitride coating particles and between the coating and the crucible is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B28/06C30B29/06C04B41/89
Inventor 陈红荣胡动力何亮鄢俊琦孙庚昕
Owner JIANGXI SAI WEI LDK SOLAR HI TECH CO LTD
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