Improvements in the treatment of metals and refractory materials and of tools or crucibles made thereof and in the electric furnaces used therefor

摘要

140,835. Marsh, G. July 4, 1918. Electrode furnaces.-Tools, crucibles, metals, or refractory materials are heated by metal molten by an arc, and also by passage of current between a conductor connected with the tools &c. and a conducting extending into the molten metal. The tools &c. may be placed in a pocket in the wall of a furnace containing molten metal, or, as shown in Fig. 4, in a crucible f immersed in the metal m which is heated by an arc between electrodes b, Fig. 2, additional electrodes d, g being provided for passage of current through the tools &c. The metal m may consist of a ferrous alloy with chrome, cobalt, and tungsten, and a small percentage of vanadium and molybdenum. An insulated conductor c extends between the electrodes b.