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Crucible for melting crystalline silicon, method for producing crucible and spray coating liquid

A technology of crystalline silicon and spraying liquid, applied in the field of spraying liquid, can solve the problems of mechanical instability, unfavorable production and use, falling off or peeling, etc., and achieves the effect of solving difficult peeling and damage, difficult peeling and damage, and reducing production costs.

Inactive Publication Date: 2012-11-28
TAIZHOU BEYOND TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in actual use, due to the difference between the thermal expansion coefficients of the crucible and crystalline silicon, it is easy to cause coating damage and peeling off, which seriously reduces the production efficiency of crystalline silicon, and even leads to the scrapping of the entire crystalline silicon
If only silicon nitride coating is used, it is mechanically weak and may fall off or peel off during use or even before use, which is not conducive to actual production and use operations; and the thickness of the coating can only reach about 300 microns , can not prevent the penetration of impurities such as oxygen

Method used

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  • Crucible for melting crystalline silicon, method for producing crucible and spray coating liquid
  • Crucible for melting crystalline silicon, method for producing crucible and spray coating liquid
  • Crucible for melting crystalline silicon, method for producing crucible and spray coating liquid

Examples

Experimental program
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Effect test

Embodiment 1

[0084] A method for preparing a crucible for melting crystalline silicon, the specific method is as follows:

[0085] Use alumina with a purity of 99.8% as raw material to sinter the main body of an alumina ceramic crucible with a capacity of 3000mL, and its shape is suitable for the requirements of equipment for melting crystalline silicon;

[0086] Then, use the spraying solution No. 1 in the above Table 1 to evenly spray on the inner surface of the above-mentioned alumina ceramic crucible body, heat up in the air with infrared heating at a heating rate of 0.5°C / min, raise the temperature to 120°C and maintain the temperature Carry out drying treatment for 1 hour, repeat above-mentioned spraying and drying treatment 1 time, obtain the crucible containing spraying liquid embryo film;

[0087] Put the crucible containing the sprayed liquid embryo film into a heating furnace, heat up to 400° C. in an oxidative gas environment (air environment), and keep it for 3 hours to burn o...

Embodiment 2

[0090] A method for preparing a crucible for melting crystalline silicon, the specific method is as follows:

[0091] Use alumina with a purity of 99.8% as raw material to sinter the main body of an alumina ceramic crucible with a capacity of 3000mL, and its shape is suitable for the requirements of equipment for melting crystalline silicon;

[0092] Grinding the inner surface of the above-mentioned alumina ceramic crucible body to increase the roughness of the inner surface of the crucible body;

[0093] Then, use the spraying liquid No. 3 in the above Table 1 to evenly spray on the inner surface of the above-mentioned polished crucible body, use infrared heating in the air to raise the temperature, the heating rate is 0.5°C / min, raise the temperature to 100°C and maintain the temperature Carry out drying treatment for 1 hour; repeat the above-mentioned spraying and drying treatment once to obtain a crucible containing the sprayed liquid embryo film;

[0094] Put the crucibl...

Embodiment 3

[0097] A method for preparing a crucible for melting crystalline silicon, the specific method is as follows:

[0098] Use alumina with a purity of 99.8% as raw material to sinter the main body of an alumina ceramic crucible with a capacity of 3000mL, and its shape is suitable for the requirements of equipment for melting crystalline silicon;

[0099] Grinding the inner surface of the above-mentioned alumina ceramic crucible body to increase the roughness of the inner surface of the crucible body;

[0100] Then, use the spraying liquid No. 5 in the above Table 1 to evenly spray on the inner surface of the above-mentioned polished crucible body, use infrared heating in the air to raise the temperature, the heating rate is 0.5 ° C / min, and the temperature is raised to 80 ° C and maintained at the temperature Carry out drying treatment for 1.5 hours; repeat the above-mentioned spraying and drying treatment process once to obtain a crucible containing the sprayed liquid embryo fi...

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Abstract

The invention relates to a crucible for melting crystalline silicon, a method for producing the crucible and a spray coating liquid, belongs to the technical field of crucibles, is used for solving the problem that the coating of the existing crucible is easy to peel off and damage during the use process, so impurities cannot be well prevented from permeating, and aims to provide the spray coating liquid for a coating of a crucible for melting crystalline silicon. The spray coating liquid comprises silicon nitride, a sintering additive, and organic binder, inorganic binder and a sintering binder which can be bonded with a crucible body at normal temperature. The invention further provides the crucible which adopts the spray coating liquid. The crucible comprises a crucible body, the internal surface of the crucible body is coated with a coating, and the coating is formed by spraying the spray coating liquid. The invention also provides the method for producing the crucible, which produces the crucible for melting crystalline silicon through spray coating, drying, burning off and sintering. The crucible can be repeatedly used, the coating is not easy to peel off and damage, so the impurities, particularly oxygen element in the crucible body can be effectively prevented from permeating.

Description

technical field [0001] The invention relates to a crucible, in particular to a crucible for melting crystalline silicon, a preparation method thereof and a spraying liquid, and belongs to the technical field of crucibles. Background technique [0002] Crystalline silicon is the main raw material for solar cells. However, in order to obtain higher conversion efficiency and lower photovoltaic power generation costs, crystalline silicon with sufficient purity is required. Therefore, it is required to have sufficiently high-quality crystalline silicon for melting The crucible can prevent the impact or infiltration of impurities. [0003] The existing crucibles for melting crystalline silicon are mainly crucibles made of quartz. Due to the physical properties of quartz raw materials, the disadvantage is that they can only be used (melted) once and will be damaged. There will be impurities in the quartz raw material of the crucible, especially oxygen element infiltrated into the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B35/00F27B14/10C04B41/87
CPCC04B41/5066C30B35/002C30B35/00C30B29/06F27B14/10C30B11/002C04B41/87C04B41/009
Inventor 张礼强
Owner TAIZHOU BEYOND TECH
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