Verfahren zum zonalen Erhitzen von langgestreckten Chargen von Materialien und Vorrichtung zur Durchführung des Verfahrens

摘要

973,754. Inductive heating. PHILIPS ELECTRONIC ASSOCIATED INDUSTRIES Ltd. Sept. 12, 1961 [Sept. 15, 1960], No. 32692/61. Heading H5H. [Also in Division B1] Apparatus for the moving zone heat treatment of an elongated mass of material 3 comprises a pair of high frequency single turn coils 7, 8 surrounding a tube 1 of vitreous quartz which holds a crucible 2 containing the mass of material and a ribbed graphite heating ring 5 which encircles the crucible and is guided for movement in the longitudinal direction of the mass by the inner walls of the tube. The ring is positioned between the coils and heats a zone of the material when high frequency current is applied in the same phase to each coil. The reaction between the field produced by the induced current in the ring and the field set up by the coils maintains the relative position of the ring and coils and as these are moved externally along the tube, the ring and hence the heated zone moves in the direction of the length of material. The apparatus may be used for zone melting of semi-conductor material or for moving zone heat treatment in the manufacture of sintered rods or the recrystallization of rods or wires.