Crucible induction furnace
A crucible induction heating furnace is essentially an oven lined with refractory ramming compound surrounded by a water-cooled induction coil. The lining forms a crucible where the metal is melted. The magnetic field interacts with electrical currents to create electromagnetic forces that raise the temperature of the bath and agitate the cast metal.
The stronger the agitation, the lower the frequency and this creates a more consistent bath. These furnaces are used in steel and iron mills, but can also be used for nonferrous metals.
Medium-frequency graphite crucible induction furnaces are typically used to cast precious metals. The crucible and the inductor can also be placed in a vacuum chamber for custom casting applications.