Crucible coating used for preparation of solar grade polysilicon, preparation method thereof and crucible

A polysilicon preparation and crucible coating technology, which is applied in glass manufacturing equipment, crystal growth, single crystal growth, etc., can solve the problem of no help in impurity removal, achieve easy demoulding, reduce production costs, and improve strength.

Inactive Publication Date: 2012-05-16
PROPOWER RENEWABLE ENERGY SHANGHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this coating does not help in the removal of impurities in the silicon

Method used

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  • Crucible coating used for preparation of solar grade polysilicon, preparation method thereof and crucible
  • Crucible coating used for preparation of solar grade polysilicon, preparation method thereof and crucible

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The coated crucible used in the preparation of solar-grade polysilicon has a structural schematic 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 silicon dioxide, hydrogen Crucible coating 1 made from barium oxide and water. The thickness of the crucible coating 1 is 30-300 microns.

[0027] The above-mentioned crucible coating 1 is a crucible coating 1 used in the preparation of solar-grade polysilicon, and the preparation method of the crucible coating 1 is as follows:

[0028] (1) Mix silicon dioxide and barium hydroxide powder at a mass ratio of 20:1, wherein the particle size of silicon dioxide and barium hydroxide powder is 1500-2000 mesh.

[0029] (2) Add the mixed powder to deionized water and mix thoroughly, wherein the weight ratio of the mixed powder to deionized water is 1:2, and the resistivity of the deionized water is 10 megohms.

[0030] (...

Embodiment 2

[0034] The crucible with coating used in the preparation of solar-grade polysilicon in this embodiment is like embodiment 1, but wherein, the preparation method of crucible coating 1 is as follows:

[0035] (1) Mix silicon dioxide and barium hydroxide powder at a mass ratio of 20:1, wherein the particle size of silicon dioxide and barium hydroxide powder is 1000-1500 mesh.

[0036] (2) Add the mixed powder to deionized water and mix thoroughly, wherein the weight ratio of the mixed powder to deionized water is 1:2.5, and the resistivity of the deionized water is 15 megohms.

[0037] (3) Spray the mixed compound powder suspension on the inner wall of the quartz crucible body 2, and dry it at 80° C. for 6 hours.

[0038] (4) The dried crucible body 2 enters a heating furnace, and is sintered at 950° C. for 6 hours, and finally a layer of dense and uniform coating is obtained on the inner wall of the crucible body 2 .

[0039] Under the same method of purifying the ingot, the bo...

Embodiment 3

[0041] The crucible with coating used in the preparation of solar-grade polysilicon in this embodiment is like embodiment 1, but wherein, the preparation method of crucible coating 1 is as follows:

[0042] (1) Mix silicon dioxide and barium hydroxide powder at a mass ratio of 30:1, wherein the particle size of silicon dioxide and barium hydroxide powder is 1000-2000 mesh.

[0043] (2) Add the mixed powder into deionized water and mix thoroughly, wherein the weight ratio of the mixed powder to deionized water is 1:2.5, and the resistivity of the deionized water is 20 megohms.

[0044] (3) Spray the mixed compound powder suspension on the inner wall of the quartz crucible body 2, and dry it at 80° C. for 6 hours.

[0045] (4) The dried crucible body 2 enters a heating furnace, and is sintered at 950° C. for 6 hours, and finally a layer of dense and uniform coating is obtained on the inner wall of the crucible body 2 .

[0046]Under the same method of purifying the ingot, the b...

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Abstract

The invention discloses a crucible coating used for the preparation of solar grade polysilicon, a preparation method thereof and a crucible. The crucible coating is mainly prepared from silicon dioxide, barium hydroxide and water as raw materials. The preparation method of the coating comprises the followings steps of: mixing silicon dioxide and barium hydroxide powder, adding deionized water, homogenizing the mixture, spraying the mixture to the inner wall of a crucible main body, and drying and sintering the crucible main body to obtain the coating. The crucible comprises a crucible main body made of a quartz material, wherein one crucible coating is coated to the inner wall of the crucible main body. The invention relates to an effective quartz crucible coating. The crucible with the coating can be successfully used for smelting, purifying and ingoting solar grade polysilicon, the reaction between molten silicon and the crucible material can be effectively prevented, and the pollution of the molten silicon by the crucible material and the adhesion between ingots and the crucible is avoided. Meanwhile, certain contribution is made to remove impurities by using chemical reactions between coating compositions and the molten silicon and the impurities therein.

Description

technical field [0001] The invention relates to the technical field of metallurgical purification of solar-grade polysilicon, in particular to a crucible coating used in the preparation of solar-grade polysilicon, a preparation method thereof, and the coated crucible. Background technique [0002] Due to the high production cost of Siemens polysilicon purification technology, in recent years, the technology of preparing solar-grade polysilicon by metallurgical purification has been widely valued. Metallurgical purification technology requires refining and ingot casting of silicon materials, and the charging container used is usually a quartz crucible. Due to the high melting point of silicon, it takes a long time to refine and cast ingots, and chemical reactions easily occur between silicon liquid and crucibles at high temperatures for a long time. On the one hand, the reaction leads to the dissolution of oxygen and other impurity elements into the silicon liquid, which pol...

Claims

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Application Information

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IPC IPC(8): C30B15/10C03B20/00C03C17/23C30B29/06
Inventor 史珺宗卫峰程素玲
Owner PROPOWER RENEWABLE ENERGY SHANGHAI
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