Silicon nitride solution and preparation method, and polysilicon ingot casting crucible and making method thereof

A silicon nitride and polysilicon technology, which is applied in the fields of polysilicon ingot crucible and its preparation, silicon nitride solution and its preparation, can solve the problems of silicon ingot sticking, paint falling off, coating falling off, etc.

Active Publication Date: 2013-09-11
TIANJIN YINGLI NEW ENERGY RESOURCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the inner wall of the crucible is smooth, which will cause the coating to fall off during the process of spraying silicon nitride, resulting in spraying failure. Even if the spra...

Method used

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preparation example Construction

[0018] The embodiment of the present invention discloses a method for preparing a silicon nitride solution, comprising:

[0019] Mix silicon nitride powder with deionized water, then add hydrochloric acid, and stir to obtain a silicon nitride solution.

[0020] According to the present invention, the silicon nitride powder of the present invention is obtained through grinding. The average particle diameter of the silicon nitride powder is preferably 0.1 μm to 0.5 μm. The silicon nitride is an important structural ceramic material, which is a superhard substance with lubricity, wear resistance, oxidation resistance at high temperature, and resistance to cold and heat shocks. Heating to above 1000°C, rapid cooling and rapid heating will not break. In order to better dissolve the silicon nitride powder, in the present invention, the deionized water is preferably stirred first, and then the silicon nitride powder is added. The mass ratio of the silicon nitride powder to the dei...

Embodiment 1

[0033] Measure 2550ml of deionized water in a beaker, stir the deionized water with an electric stirrer, grind 600g of silicon nitride powder, then put in the ground silicon nitride powder, stir for 15min, then put in a concentration of 2wt% 40ml of hydrochloric acid, and stirred for 20min to obtain a silicon nitride solution.

[0034] The US BROOKFIELD viscometer is used for testing, the room temperature is 21.6°C, and the viscosity of the silicon nitride solution is 29.7us / cm.

Embodiment 2

[0036] Measure 3000ml of deionized water in a beaker, stir the deionized water with an electric stirrer, grind 600g of silicon nitride powder, then put the ground silicon nitride powder, stir for 20min, and put in hydrochloric acid with a concentration of 2wt%. 50ml, and after stirring for 20min, a silicon nitride solution was obtained.

[0037] The US BROOKFIELD viscometer is used for testing, the room temperature is 21.6°C, and the viscosity of the silicon nitride solution is 30us / cm.

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Abstract

The invention provides a silicon nitride solution and a preparation method thereof. The preparation method of the silicon nitride solution comprises a step of mixing silicon nitride powder with deionized water, a step of adding hydrochloric acid, and a step of stirring to obtain the silicon nitride solution. The invention also provides a polysilicon ingot casting crucible and a making method thereof. The making method of the polysilicon ingot casting crucible comprises a step of heating a crucible body, and a step of spraying the silicon nitride solution onto the surface of the inner wall of the crucible body to obtain the polysilicon ingot casting crucible. Hydrochloric acid diminishes the pH value of the silicon nitride solution and makes a Zeta potential approach zero, so the intergranular static repulsion force is reduced, the agglomeration effect is enhanced, and agglomeration is easy, thereby the bonding strength between the silicon nitride solution and the crucible is increased, and a problem of crucible stickiness caused by coat shredding is avoided.

Description

technical field [0001] The invention relates to the technical field of polysilicon ingot production, in particular to a silicon nitride solution and a preparation method thereof, a crucible for polysilicon ingots and a preparation method thereof. Background technique [0002] The polysilicon ingot industry is mainly divided into three links: crucible spraying, crucible charging and ingot casting. The whole process of ingot casting is divided into heating, melting, growth, degradation and cooling. During the heating process, the bulk silicon material reaches the melting point after heating to form liquid silicon, and the main material of the crucible is silicon dioxide. The chemical reaction of silicon oxide will cause the sticky crucible to make demoulding difficult, and in severe cases, it will cause the crucible to rupture and cause silicon leakage, resulting in economic losses and safety accidents. Therefore, it is necessary to spray a layer of silicon nitride coating on...

Claims

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Application Information

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IPC IPC(8): C03C17/22C30B11/00C30B28/06C30B29/06
Inventor 张小建刘华王悦杨杰魏驰远
Owner TIANJIN YINGLI NEW ENERGY RESOURCES
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