CAST IRON PRODUCT FOR VACUUM VESSEL AND PRODUCTION THEREOF

PURPOSE:To produce a cast iron product for a vacuum vessel effective in keeping the degree of vacuum of a high vacuum atmosphere by coating the inside of a casting mold with a graphite spheroidizing agent and pouring molten cast iron to spheroidize graphite only in the surface layer of the resulting...

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Bibliographische Detailangaben
Hauptverfasser:	NATORI TATSUO, FURUSE MUNEO
Format:	Patent
Sprache:	eng
Schlagworte:	ALLOYS CASTING CASTING OF METALS CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES CHEMISTRY FERROUS OR NON-FERROUS ALLOYS METALLURGY METALLURGY OF IRON PERFORMING OPERATIONS POWDER METALLURGY PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OFWROUGHT-IRON OR STEEL TRANSPORTING TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Beschreibung
Zusammenfassung:	PURPOSE:To produce a cast iron product for a vacuum vessel effective in keeping the degree of vacuum of a high vacuum atmosphere by coating the inside of a casting mold with a graphite spheroidizing agent and pouring molten cast iron to spheroidize graphite only in the surface layer of the resulting casting. CONSTITUTION:A frame 8 is placed on a suction box 5 provided with a filter 5a and a suction hole 5b and a material 7 for a casting mold is filled into the frame 8 so as to leave a cavity 6. This cavity 6 is lined with a graphite spheroidizing agent (Fe-Si-Mg powder) mixed with a binder to form a coating layer 6a. Molten cast iron 10 is then poured into the cavity 6 from a sprue and gas generated by a reaction is exhausted by suction from the suction hole 5b. A casting contg. spheroidized graphite only in the surface layer is obtd. and the outside of the casting is plated as required.