Crucible coating for purification and ingot casting of solar grade polysilicon and preparation method thereof as well as crucible

A crucible coating, solar-grade technology, applied in the direction of self-melt pulling method, crystal growth, single crystal growth, etc., can solve problems such as erosion, achieve the effects of improving bonding strength, inhibiting damage, and preventing peeling

Inactive Publication Date: 2015-02-11
PROPOWER RENEWABLE ENERGY SHANGHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But at high temperature, sodium, the main component in water glass, will corrode the crucible material.

Method used

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  • Crucible coating for purification and ingot casting of solar grade polysilicon and preparation method thereof as well as crucible

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The crucible for purifying ingots of solar-grade polysilicon has a schematic structural diagram as shown in the accompanying drawings, including a crucible body 2 made of quartz, wherein the inner wall of the crucible body 2 is coated with a layer of water glass, silicon nitride powder, hydrogen Crucible coating 1 made of barium oxide powder and nano silicon dioxide powder as raw materials. The thickness of the crucible coating 1 is 30-300 microns.

[0028] Among them, the crucible coating 1 is a crucible coating 1 for ingot purification of solar-grade polysilicon, and the preparation method of the crucible coating 1 includes the steps of:

[0029] (1) Production of water glass

[0030] Mix high-purity sodium carbonate and high-purity quartz sand at a weight ratio of 1:1.5. After melting at 1500°C, flow through deionized water to obtain molten sodium silicate particles; then pass through steam at 140°C and heat for 5 hours to prepare water glass.

[0031] (2) silicon...

Embodiment 2

[0034] The crucible used in the solar-grade polycrystalline silicon ingot purification in this embodiment is the same as embodiment 1, but wherein, the preparation method of crucible coating 1 is as follows:

[0035] (1) Production of water glass

[0036] Mix high-purity sodium carbonate and high-purity quartz sand at a weight ratio of 1:1.5. After melting at 1400°C, flow through deionized water to obtain molten sodium silicate particles; then pass through steam at 120°C and heat for 4.5 hours to prepare water glass.

[0037] (2) Mix silicon nitride powder and barium hydroxide powder in a weight ratio of 10:1, add 10% nano silicon dioxide, and mix the solid powder and water glass in a ratio of 1:1 by weight After mixing thoroughly, brush on the inner wall of the quartz crucible body 2, dry at 100°C for 1 hour, and finally sinter at 1000°C for 1 hour, and finally obtain a dense and uniform protective coating on the inner wall of the crucible body 2.

[0038] The crucible coat...

Embodiment 3

[0040]The crucible used in the solar-grade polycrystalline silicon ingot purification in this embodiment is the same as embodiment 1, but wherein, the preparation method of crucible coating 1 is as follows:

[0041] (1) Production of water glass

[0042] Mix high-purity sodium carbonate and high-purity quartz sand at a weight ratio of 1:1.5. After melting at 1600°C, flow through deionized water to obtain molten sodium silicate particles; then pass through steam at 160°C and heat for 4 hours to prepare water glass.

[0043] (2) silicon nitride powder and barium hydroxide powder are mixed in a weight ratio of 15: 1, add 15% nano silicon dioxide powder, and the mixed solid powder and water glass are in a ratio of 1: 1 by weight After mixing and mixing thoroughly, spray on the inner wall of the quartz crucible body 2, dry at 80°C for 3 hours, and finally sinter at 800°C for 3 hours, and finally obtain a dense and uniform protective coating on the inner wall of the crucible body 2...

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Abstract

The invention discloses a crucible coating for purification and ingot casting of solar grade polysilicon and a preparation method thereof as well as a crucible. The crucible coating is coated on the inner wall of a crucible body, and is mainly prepared from sodium silicate, silicon nitride powder, barium hydroxide powder and nano silicon dioxide powder. The preparation method of the crucible coating comprises the following steps of: selecting raw materials, uniformly mixing the raw materials in a certain ratio, spraying the uniformly mixed raw materials on the inner wall of the crucible body, and drying followed by sintering to obtain the crucible coating. The crucible comprises a crucible body made of a quartz material, wherein the inner wall of the crucible body is coated with a crucible coating layer. The crucible coating disclosed by the invention can effectively prevent coating particles from falling off to cause silicon crystals to be polluted, and has an impurity removal effect.

Description

technical field [0001] The invention relates to a crucible coating in the preparation of solar-grade polysilicon, in particular to a crucible coating for ingot purification of solar-grade polysilicon, its preparation method and the crucible. Background technique [0002] Due to the high production cost of the polycrystalline silicon purification technology of the Siemens method, and the purity of silicon produced by the Siemens method is as high as 11N, while the purity requirement of solar-grade silicon is only 6-7N, therefore, the application of the Siemens method to the field of solar silicon cell manufacturing will cause serious problems. Unnecessary waste of resources and costs. In recent years, the technology of preparing solar-grade polysilicon by metallurgical purification has gained extensive attention. [0003] Metallurgical purification technology requires refining and ingot casting of silicon materials, and the charging container used is usually a quartz crucibl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B15/10C30B29/06C03C17/22
Inventor 史珺程素玲
Owner PROPOWER RENEWABLE ENERGY SHANGHAI
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