GRAPHITE ELECTRODES WITH PROTECTIVE COATING

The protective coating consists of three layers. As alloying additives in the first and second layer or only in the second layer are used, nickel and iron or their oxides whereby the nickel content is from 0.05 to 0.95% and the iron content is, respectively, from 0.1 to 15% with regard to the total...

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Bibliographische Detailangaben
Hauptverfasser:	YORDAN TODOROV PIROV, VASSIL GEORGIEV PEEV, MAXSIM OBRETENOV TZONEVSKI
Format:	Patent
Sprache:	eng
Schlagworte:	ALLOYS APPARATUS THEREFOR ARTIFICIAL STONE CEMENTS CERAMICS CHEMICAL SURFACE TREATMENT CHEMISTRY COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING MATERIAL WITH METALLIC MATERIAL COATING METALLIC MATERIAL COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS CONCRETE DIFFUSION TREATMENT OF METALLIC MATERIAL ELECTRIC HEATING ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR ELECTRICITY ELECTROFORMING ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FERROUS OR NON-FERROUS ALLOYS INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL LIME, MAGNESIA METALLURGY PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTIONOF COATINGS REFRACTORIES SLAG SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION TREATMENT OF ALLOYS OR NON-FERROUS METALS TREATMENT OF NATURAL STONE
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Beschreibung
Zusammenfassung:	The protective coating consists of three layers. As alloying additives in the first and second layer or only in the second layer are used, nickel and iron or their oxides whereby the nickel content is from 0.05 to 0.95% and the iron content is, respectively, from 0.1 to 15% with regard to the total amount of aluminum. Both layers are submitted to heat treatment with surface density of the heat flow from 8 to 16.106 W/m2. The third layer consists of aluminum with technical grade purity. The thus described graphitic electrodes are used in arc furnaces.