CORROSION AND WEAR RESISTANT OVERLAY, METHOD FOR FORMING CORROSION AND WEAR RESISTANT OVERLAY, AND CORROSION AND WEAR RESISTANT VALVE

The invention is intended to improve the corrosion resistance of an overlay used in a severe environment such as a nuclear power plant, and to reduce dissolution of cobalt from an overlay. The corrosion and wear resistant overlay 7 is formed along a surface of a base 2 by using laser lamination mode...

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Bibliographische Detailangaben
Hauptverfasser:	MIYATA, Hajime, SHIRATORI, Hiroshi, KIYOTOKI, Yoshihisa, HIRANO, Sei, MATSUSHITA, Shinji, KAWANAKA, Hirotsugu
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	ACTUATING-FLOATS ALLOYS BLASTING CASTING CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS ANDNON-FERROUS ALLOYS CHEMICAL SURFACE TREATMENT CHEMISTRY CLADDING OR PLATING BY SOLDERING OR WELDING 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 COCKS COMBINED OPERATIONS CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES DEVICES FOR VENTING OR AERATING DIFFUSION TREATMENT OF METALLIC MATERIAL ENGINE PLANTS IN GENERAL ENGINEERING ELEMENTS AND UNITS FERROUS OR NON-FERROUS ALLOYS GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS HEATING INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL LIGHTING MACHINE TOOLS MACHINES OR ENGINES IN GENERAL MAKING METALLIC POWDER MANUFACTURE OF ARTICLES FROM METALLIC POWDER MECHANICAL ENGINEERING METAL-WORKING NOT OTHERWISE PROVIDED FOR METALLURGY NUCLEAR ENGINEERING NUCLEAR PHYSICS NUCLEAR REACTORS OTHER WORKING OF METAL PERFORMING OPERATIONS PHYSICS POWDER METALLURGY SOLDERING OR UNSOLDERING STEAM ENGINES SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION TAPS THERMAL INSULATION IN GENERAL TRANSPORTING TREATMENT OF ALLOYS OR NON-FERROUS METALS UNIVERSAL MACHINE TOOLS VALVES WEAPONS WELDING WORKING BY LASER BEAM WORKING METALLIC POWDER
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Beschreibung
Zusammenfassung:	The invention is intended to improve the corrosion resistance of an overlay used in a severe environment such as a nuclear power plant, and to reduce dissolution of cobalt from an overlay. The corrosion and wear resistant overlay 7 is formed along a surface of a base 2 by using laser lamination modeling, and is configured from a plurality of metal layers 1a, 1b, 1c, and 1d of a Co-base alloy. The size (thickness) of carbide eutectics that precipitate in the metal layers la, 1b, 1c, and 1d is the largest in the metal layer 1a closest to the base 2, and is gradually smaller in the metal layers 1b, 1c, and 1d farther away from the base 2. The intensity of the laser beam applied to form layers by laser lamination modeling is appropriately adjusted so that the carbide eutectics that precipitate in at least the outermost metal layer 1d have a controlled size of 10 µm or less.