Purification of materials non-electrically conductive in the solid state and electrically conductive in the molten state with electric induction power
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United States of America Patent
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Jun 11, 2013
Grant Date -
Jun 3, 2010
app pub date -
Nov 25, 2009
filing date -
Dec 1, 2008
priority date (Note) -
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Abstract
The present invention is apparatus for, and method of, heating, melting and purifying a material by electric induction heating in a susceptor furnace. Non-electrically conductive solid charge may initially be placed in the furnace. Output frequency from a power source supplying current to one or more induction coils surrounding the furnace is selected to maximize magnetic coupling with the susceptor material in the susceptor furnace to induce eddy current heating in the material. Heat transfers by conduction from the susceptor material to the non-electrically conductive charge placed in the susceptor furnace to melt the charge. Output frequency is reduced as the charge melts and becomes electrically conductive to enhance magnetic coupling with the melt in the furnace. Degassing of impurities from the melt can be achieved by bubbling a gas through the melt while the surface level of the melt is maintained at vacuum. Degassing is enhanced by creating an electromagnetic ripple/wave action that increases the surface area of the melt during the degassing process.
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