Silicon nitride crucible coating and preparation method thereof

A silicon nitride crucible and silicon nitride technology, applied in the field of solar cells, can solve the problems of silicon nitride coating dust, high calcination temperature, and large energy consumption

Inactive Publication Date: 2013-07-03
ZHEJIANG YUHUI SOLAR ENERGY SOURCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the silicon nitride coating has a lot of dust during the thermal spraying process, and bubbles are easy to appear in some parts, and the calcination temperature is high, and the energy consumption is large.

Method used

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preparation example Construction

[0021] The embodiment of the present invention discloses a method for preparing a silicon nitride crucible coating, comprising the following steps:

[0022] Add binder, dispersant and silicon nitride to deionized water, mix uniformly to obtain slurry; the weight ratio of silicon nitride, binder and dispersant is 100:(15~28):(5~12 ), the weight ratio of silicon nitride and deionized water is 1: (3~4); the binder is one of organosilane, silicic acid, polyhydric alcohol, polyvinyl alcohol and acrylate;

[0023] The slurry is sprayed or dipped on the inner surface of the crucible, and calcined and annealed in an inert gas atmosphere at 260° C. to 550° C.

[0024] In the invention, a slurry containing silicon nitride and a binder is prepared first, and then the slurry is coated on the inner surface of a crucible and then calcined and annealed, and a silicon nitride coating is formed on the surface of the crucible after annealing. Wherein, the first step is a step of preparing the ...

Embodiment 1

[0038] Measure 1300ml of deionized water. Measure 90ml of binder and 20g of dispersant into deionized water and mix well. Weigh 380 g of silicon nitride, add it into the above solution, stir it evenly with ultrasonic waves, and prepare a slurry. The slurry was applied to the inner surface of the crucible by thermal spraying. The slurry-coated crucible was then calcined and annealed at 300 °C in an argon atmosphere. After testing, the prepared coating has an oxygen content of 3.6 wt%, and the silicon ingot can be demoulded smoothly when used for polysilicon ingot casting.

Embodiment 2

[0040] Measure 1300ml of deionized water. Measure 80ml of binder and 30g of dispersant into deionized water and mix well. Weigh 380 g of silicon nitride, add it into the above solution, stir it evenly with ultrasonic waves, and prepare a slurry. The slurry was applied to the inner surface of the crucible by thermal spraying. The slurry-coated crucible was then calcined and annealed at 300 °C in an argon atmosphere. After testing, the prepared coating has an oxygen content of 4.5 wt%, and the silicon ingot can be successfully released from the mold when used for polysilicon ingot casting.

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Abstract

The invention provides a silicon nitride crucible coating and a preparation method thereof. The preparation method comprises the following steps: adding adhesive, dispersant and silicon nitride into the deionized water, and uniformly mixing to obtain the sizing agent, wherein weight ratio of silicon nitride to adhesive to dispersant is 100 : (15-28) : (5-12), weight ratio of silicon nitride to deionized water is 1 : (3-4), and the adhesive is one of organosilan, metasilicic acid, polyatomic alcohol, polyvinyl alcohol and acrylate; and spraying or dipcoating the sizing agent to the inner surface of the crucible, and performing calcination and annealing at the temperature of 260 DEG C to 550 DEG C in an inert gas atmosphere, wherein oxygen content of the silicon nitride crucible coating is 1 wt% to 5 wt%. According to the invention, a certain amount of adhesive is added into the sizing agent, and subsequent calcination is controlled to be carried out in the argon gas atmosphere, so that a great amount of dust generated in the spraying process is avoided, and adhesion strength of the coating is enhanced, and as the oxygen content of the coating is controlled to be lower, the requirement of high-quality polycrystalline silicon chip production for the oxygen content of the coating can be met.

Description

technical field [0001] The invention relates to the field of solar cells, in particular to a silicon nitride crucible coating and a preparation method thereof. Background technique [0002] In recent years, with the increasing maturity of solar power generation technology, solar cells have been widely used in many fields such as industry, agriculture and aerospace. At present, according to the different materials used, solar cells can be divided into: silicon solar cells, compound thin film solar cells and polymer multilayer modified electrode solar cells, organic solar cells and nanocrystalline solar cells. Among them, the development of silicon solar cells is the most mature and occupies a dominant position in the application. Crystalline silicon solar cells are further divided into monocrystalline silicon solar cells and polycrystalline silicon solar cells. Compared with monocrystalline silicon solar cells, the preparation process of polycrystalline silicon solar cells ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C17/22
Inventor 卢建华彭春球刘文涛
Owner ZHEJIANG YUHUI SOLAR ENERGY SOURCE
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