Sell Silicon Nitride Si3N4 for making solar multi-ingot

Description

Sell  Silicon Nitride Si3N4 for making solar  multi-ingot

If the silicon raw materials and the crucible wall are linked closely together, either of crystalline silicon or crucible most likely would crack during the process of cooling crystal substance. Furthermore, the ceramic crucibles are easily corroded through direct contact with the silicon melt in the long period of time, also which would contribute to increasing the oxygen concentration in the polysilicon. To solve these problems, the foreign technology apply the high-purity Silicon nitride materials, used as a coating attached to the crucible wall, to isolate silicon melt from the crucible, whereupon not only the viscosity problem is resolved, but also the oxygen in the polysilicon, the concentration of carbon and other impurities are greatly reduced.


 

At performing polysilicon ingots, the main role of Silicon nitride is to serve as the agent of releasing mold when having silicon melt separate favorably from the quartz crucible. The characteristics of Silicon nitride are with high purity, the even distribution of the particles, which are larger than the surface area, that make it easier to apply sintering onto the surface to form a uniform barrier layer with high reliability. The silicon nitride insulation has the resistance to high-temperature, and has great barrier effect to block those trace elements, oxygen, carbon and etc. After coating with Silicon nitride, the silicon substance and the crucible are easily separated from one another, which would improve the re-utilization of quartz crucible and result in a significant reduction in the production cost.