초록

A coating is provided which substantially lengthens the life of carbon and graphite electrodes used in electrical arc processes for the manufacture of ferrous metals. The coating forms a silica-phosphorus glass upon the electrodes.

대표청구항 ▼

An electrically conductive consumable carbon and/or graphite electrode having an impermeable coating of less than ¼″thickness of a non-electrically conducting crystallized devitrifyable silica-phosphate glass containing titanium dioxide. A method of protecting carbon and graphite electrodes used in

An electrically conductive consumable carbon and/or graphite electrode having an impermeable coating of less than ¼″thickness of a non-electrically conducting crystallized devitrifyable silica-phosphate glass containing titanium dioxide. A method of protecting carbon and graphite electrodes used in the production of ferrous metals in electrical arc furnaces from oxidation during use which comprises coating said electrodes prior to their use with a composition comprising in percentages by weight: 10-70% water; 0.5-15% finely divided silicon dioxide having a particle size less than 200 mesh; 1-25% phosphoric acid; 2-50% titanium dioxide having a particle size of less than 375 mesh; 2-50% silicon carbide; 0.05-7.5% sodium hexameta phosphate; 0.1-5.0% organic thickener; whereby the composition forms a crystallized devitrifyable silica-phosphate glass protecting the electrode from oxidation during use.