ELECTROMAGNETIC CASTING DEVICE FOR SILICON

摘要

Provided is an electromagnetic casting device for silicon which has a non-bottom cooling mold, a heating induction coil, and a heat retention device, which is disposed below the mold and gradually cools silicon concreted, and lowers the silicon melted by electromagnetic induction heating by the induction coil to concrete the silicon. The electromagnetic casting device uses a nonconductive member as a component of an outer frame (16) of the heat retention device (13). The nonconductive member is capable of being used only for a specific surface of the outer frame on which a dissolved loss is particularly significantly caused or only for an upper portion of the entire surface of the outer frame. As the nonconductive member, alumina or silicon carbide is desirable. It is possible to manufacture preferable polycrystalline silicon as a substrate material for a solar cell while preventing the dissolved loss due to heat of the outer frame of the heat retention device provided below the heating induction coil and preventing contamination of the inside of a furnace and an ingot due to metal impurities.