6results about "Furnaces without endless core" patented technology

This invention relates to a method for melting and processing, particularly mixing, conductive materials, especially sponge iron, having a high content of gangue and slagging agent, using at least one induction furnace (1) and coupling at least one alternating magnetic field to the material via at least one first coil assembly (4) and at least one second coil assembly (5), the first and second coil assemblies surrounding a melting crucible (2) of the induction furnace (1) having a crucible volume (3) for containing the material, wherein the method comprises melting and stirring the molten material while the first coil assembly (4) and the second coil assembly (5) are operating simultaneously, wherein, particularly during operation of the induction furnace (1), the phase angle of the alternating voltage of the first coil assembly (4) and / or the second coil assembly (5) is adjusted such that, during stirring operation, the phase angle of the alternating voltage of the first coil assembly (4) is at least temporarily offset relative to the phase angle of the alternating voltage of the second coil assembly (5). The invention also relates to an induction furnace (1) for carrying out the method.

A magnetic induction furnace (1) adapted to heat solid or tubular metal billets (5), of various lengths and diameters, made of non-ferrous materials, for example to be extruded, comprises a fixed body or carcass (16) in which there is arranged an electric motor (21) defined by an electric stator (23) into which it is inserted an annular electric rotor (25) connected to a rotor body or tubular support (26) carrying a plurality of permanent magnets (27) arranged so as to define a hollow magnetic cylinder in which there is provided for a cavity (10) adapted to contain a non-rotating billet (5) to be heated; the permanent magnets (27) of the rotor body (26) comprise main permanent magnets (27A) magnetised in the radial direction with respect to such rotor body (25) and auxiliary permanent magnets (27B) magnetised in the axial direction, said magnets (27A, 27B) generating flux lines of the magnetic field (X) directed in depth towards the internal of the cavity (10) adapted to contain the billet (5) so as to improve the heating thereof induced with respect to a conventional magnetic arrangement.

The present invention relates to silicon wafers and epitaxial silicon wafers. Silicon wafers are provided in which the dopant is phosphorus, the resistivity is 1.2 mΩ-cm or less, and the carbon concentration is 3.5 x 10 15 atoms / cm 3 or more. The carbon concentration near the surface of the silicon wafer is reduced by 10% or more compared to the center depth of the silicon wafer.

To prevent leakage of an electromagnetic field generated by an induction coil.SOLUTION: An induction heating assembly (22) for a vapor generating device (10) includes an induction coil (32) and a heating compartment (24) arranged to receive an induction heatable cartridge (26). A first electromagnetic shield layer (36) is arranged outside the induction coil (32), and a second electromagnetic shield layer (46) is arranged outside the first electromagnetic shield layer (36). The first and second electromagnetic shield layers (36, 46) differ in one or both of their electric conductivity and their magnetic permeability.SELECTED DRAWING: Figure 1

An induction crucible furnace includes a fireproof crucible and a coil including an outer wall and is configured to extend around the crucible. The coil includes a plurality of coil portions arranged one above the other in a longitudinal direction of the coil. An insulation is positioned between each of the plurality of coil portions and a plurality of magnetic return elements are positioned on the outer wall of the coil and are configured to extend the longitudinal direction of the coil. The insulation includes a plurality of elongated pouches filled with a pourable material.