Silicon nitride crucible coating and preparation method thereof
A technology of silicon nitride crucible and silicon nitride, which is applied in the field of solar cells, can solve the problems of silicon nitride coating with large dust, high calcination temperature, and easy bubbles, so as to improve the bonding strength, reduce the amount of dust, and improve The effect of viscosity
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[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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