Induction furnaces are one of the basic applications of MF heating. In most cases, these furnaces are crucible furnaces for melting of different materials. When an electrically non-conductive material has to be melt, the crucible must be made of electrically conductive material. Carbon crucibles are usually used to melt metals, platinum crucibles are used to melt glass. In case of lower requirements on quality and for temperatures bellow 1.100 ˚C, the crucible from steady heat steel should be sufficient. Metallic materials can be heated directly in a ceramic crucible.
For smaller furnaces, generators with an output of around 2 kW are sufficient. These can be mechanically fastened directly into a design of furnace. Power and control circuits are in a separate box. Furnaces requiring more power are supplied with a generator SFG-8. Furnace construction contains the power transformer and resonant capacitors.
Furnaces are devised as a single unit or as a part of a laboratory equipment (fiber glass puller, rotatory viscometer and others).
Some examples of furnaces are given in gallery.
|Supply voltage||230 V / 400 V|
|Wattage||1 - 10 kW|
|Working frequency||10 - 200 kHz|
|Maximal temperatore according to heat element||steady heat steel||1.150 ˚C|
|Cooling||air or water|
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