Vitreous metal alloy thread or strip mfr. - where alloy flows through nozzle kept at constant height above casting wheel to make strip with accurate dimensions

摘要

Molten alloy flows downwards through a nozzle located in the bottom of a vessel so it is quenched on a moving chill or casting wheel; and the chill or casting wheel is kept at a constant distance from the bottom end of the nozzle. The constant distance is pref. obtd. by using an air cushion or a film of lubricant between two sliding surfaces, or by rollers running on the casting wheel. One pref. appts. uses a carrier frame in which a crucible contg. the molten alloy is located, a nozzle being fitted in the base of the crucible. The frame is fitted with rollers running on the periphery of the rotating casting wheel so the frame moves vertically to keep a constant distance between the wheel and the nozzle. Used for, e.g. casting (I) Ni40Fe40P14B6; or (II) Ni45Co20Cr10Fe5Mo4B16. Casting wheels 0.2-2 metres dia. can be out of round, so cast strip of varying thickness is obtd.; the invention minimises such variations.