HEARTH ROLL HAVING EXCELLENT RESISTANCE TO BUILD-UP AND EXFOLIATION

PURPOSE:To produce a therval spray-coated hearth roll which is free from build- up and exfoliation by spraying thermally magnesia spinel via plural stage of mixed layers having the varied mixing ratios to a metal for bonding onto the surface of the hearth roll for a heat treating furnace for a steel...

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Bibliographische Detailangaben
Hauptverfasser:	MORI HIDEAKI, KAWAZOE KATSUTOSHI, MIURA MASARU, IMAMURA KOUHEI
Format:	Patent
Sprache:	eng
Schlagworte:	CASTING CASTING OF METALS CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES 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 DIFFUSION TREATMENT OF METALLIC MATERIAL GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS PERFORMING OPERATIONS POWDER METALLURGY SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION TRANSPORTING
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Beschreibung
Zusammenfassung:	PURPOSE:To produce a therval spray-coated hearth roll which is free from build- up and exfoliation by spraying thermally magnesia spinel via plural stage of mixed layers having the varied mixing ratios to a metal for bonding onto the surface of the hearth roll for a heat treating furnace for a steel plate. CONSTITUTION:An Ni-Cu-Al alloy as a metal for bonding is thermally sprayed to 0.1mm. thickness onto the surface of a hearth roll to be used in the high-temp. oxidizing atmosphere in a heat treating furnace for a steel plate. Mixed layers of the metal for bonding and magnesia spinel are then thermally sprayed onto said surface for plural stages at the increasing mixing ratios of the magnesia spinel and finally only the magnesia spinel is thermally sprayed to 0.1mm. thickness. The generation of build-up by oxide on the surface of the hearth roll is obviated and the hearth roll having the sprayed layer of the magnesia spinel which is highly resistant to exfoliation is obtd.