Super Silicon Crystal Research Institute Corp.

Tomohisa Machida

Yutaka Shiraishi

Nobumitsu Takase

The present invention aims to improve thermal efficiency and to reduce melting time when a raw material in an auxiliary crucible is heated and melted by induction heating method. When an initial raw material is at low temperature and its conductivity is relatively low, a conductive carbon cylinder is arranged at such a height as to cover the entire side wall of the auxiliary crucible , and when high frequency current is applied on a high frequency coil , secondary induction current is generated on the carbon cylinder . Then, Joule heat is generated on the carbon cylinder by the secondary induction current, and heat of the carbon cylinder is transmitted to the raw material inside via the auxiliary crucible . Thus, the raw material is heated, and melting is started. When the raw material is melted, an insulating ceramic base is arranged at such a position as to cover the entire side wall of the auxiliary crucible . Because conductivity of the raw material is gradually increased, secondary induction current is generated in the melt , and Joule heat is generated in the melt itself by the secondary induction current.

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Annaka, Japan

Tomohisa Machida