Industrial electric heating furnaces – Induction furnace device – Zone melting
Patent
1980-09-10
1983-07-05
Envall, Jr., Roy N.
Industrial electric heating furnaces
Induction furnace device
Zone melting
B01J 710
Patent
active
043922309
ABSTRACT:
Method of producing silicon by crucible-free zone melting a substantially vertically held silicon rod with which a melting zone, produced by an induction heating coil which, together with an oscillating-circuit coil connected in series therewith and determining the oscillating-circuit frequency and having a high inductance in comparison with that of the induction heating coil heating up the rod material, forms the inductive component of a heating parallel oscillating circuit fed by a high-frequency generator and has a heating circuit capacitor connected in parallel with the heating coil, is passed through the silicon rod in direction of the rod axis, which comprises dimensioning the component resonance circuit formed by the induction heating coil and the heating-circuit capacitor to a frequency deviating by less than a factor of 2 from the frequency of the high-frequency generator.
REFERENCES:
patent: 3270177 (1966-08-01), Prediger et al.
patent: 3985947 (1976-10-01), Keller
Grassmann Hans-Christian
Keller Wolfgang
Schmidt Karl
Envall Jr. Roy N.
Greenberg Laurence A.
Lerner Herbert L.
Siemens Aktiengesellschaft
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