Cold cage for a melting crucible by high frequency electromagnetic induction

摘要

Cold cage for a crucible with melting by high frequency electromagnetic induction comprising in per se known manner a series of hollow segments traversed by the cooling water and surrounded by a high or medium frequency induction coil and in which the products to be melted are confined, wherein at least part of the walls of each cage segment is constituted by at least two layers of adjacent materials, whereof the one which resists corrosion is in contact with the products to be melted and whereof the other is a good electricity conductor and wherein the relative thicknesses of these layers as well as the supply frequency of the induction coil are chosen in such a way that the eddy currents induced in the cage mainly develop in a good electricity conducting layer.