The technology of melting metals by induction heating has evolved over a hundred years, it continues to improve until now. It all started with the discovery of the phenomenon of electromagnetic induction by the scientist M. Faraday . Already at that time the first practical attempts were made to create a new technology for melting metals in the laboratory, but all of them ended in failure. At that time, there were no installations capable of generating high-frequency currents of sufficient power.
The situation began to change at the beginning of the 20th century, when the furnace design underwent significant changes. There were powerful generators and high-frequency current sources , which were used to ensure its operation.
This technology makes it possible to obtain ultrapure alloys of various metals. If the traditional melting method, for example, in a converter, leaves a large percentage of impurities, then using this method they are not available. This allows you to create ultra-pure alloys with good performance.
The induction furnace itself can have a wide variety of dimensions and purpose. It can be used in laboratory installations or large production complexes, have different power and performance.
A small homemade induction oven may well come in handy in a home laboratory. With its help, you can make, for example, solder with different contents of zinc and tin, and much more. When it is manufactured, the above-described principle of operation must be taken into account. Use a high-frequency generator (from 30 MHz and higher), a powerful power source, power modules, and as a result, in a crucible (it can consist of 6-15 turns of PEV-8.0 wire) it will be possible to melt a piece of zinc in a short time (15 -20 seconds).
The development of this technology follows the path of gradual capacity expansion of facilities, improvement of the elemental power base, increase in the frequency of the generator and the use of innovative developments in control, monitoring and protection schemes.