Melting furnace (induction heating)|Dai-ichi kiden, expert of high-frequency induction heating and hot press, induction heating apparatus

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Melting furnace (induction heating)

Melting furnace (induction heating)

No crucible, so

Reduce contamination to the limit

High-purity crystal growing


 Floating dissolution is the production method to get the high-purity conductive materials by applying a high-frequency output to a conductive material to perform heating and melting and suspending the conductive material using the frequency and eddy current of a high-frequency induction heating power supply.

Floating dissolution includes cold crucible dissolution and levitation dissolution.


  • No crucible, so no impurities are mixed in from the crucible wall. 
  • No crucible, so cost of consumables reduces. 
  • No reaction with the crucible material, so fluxes with a wide variety of ingredients and compositions can be used. 
  • Promote the refining reaction of metals by utilizing the active stirring force of the molten metal by electromagnetic force. 
  • Easy dissolution of high-purity metals and refractory metals



Cold crucible melt

This melting method has a water-cooled copper crucible inside the work coil, and a conductor is placed in it to heat it.

When the power of high-frequency induction heating is applied to the work coil, an eddy current opposite to that of the work coil is generated in the water-cooled crucible.

The eddy current of the work coil is applied to the conductive material and heating and melting proceed, but the eddy current of the copper rut and the electromagnetic repulsive force of the eddy current of the work coil act to float.

Levitation dissolution

This melting method let the lower side of the work coil wound right-handed and the upper side left-handed, and the conductor is suspended by controlling the magnetic flux generated by the current flowing through the work coil.
In addition, the eddy current flowing through the work coil heats and melts the conductor.


◆ Oxide crystals

◆ High-purity metals and alloys

◆ Silicon 


Heating method High frequency induction heating
Heating temperature 1700℃
Ultimate vacuum 5×10-4Pa
Atmosphere Vacuum or inert atmosphere or air
Melting amount 10kg (cold crucible dissolution), 100g (levitation dissolution) ※as iron
Control method Touch panel
Heatinf control Temperature or power control
Data output Data recorder・PC

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