Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Patent
1989-05-08
1990-05-08
Rosenberg, Peter D.
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
75 1018, 75 65R, 373163, 373165, C22B 400, H05B 616
Patent
active
049235087
ABSTRACT:
The crucible includes an upstanding sidewall formed of a plurality of internally cooled, metal segments arranged in side-by side relation to form a crucible chamber for receiving the metal to be melted. The segments are separated from one another by longitudinal gaps that communicate on the inside with the crucible chamber and extend outwardly to the exterior of the sidewall. The gaps are free of packing material that could constitute a potential source of melt contamination and are so sized in a width dimension where the gap and the chamber communicate as to substantially prevent penetration of molten metal into the gaps when the metal charge is initially melted in the crucible chamber prior to the development of a solidified metal skull. Upper portions of the crucible segments are restrained against outward spreading during use to provide a crucible durable enough for use in production melting applications. The crucible eliminates the need for a CaF.sub.2 type lining (skull) and for intersegment refractory packing material, thereby improving melt cleanliness.
REFERENCES:
patent: 2091087 (1937-08-01), Wempe
patent: 3014255 (1961-12-01), Bussard et al.
patent: 3223519 (1965-12-01), Shippereit
patent: 3598168 (1971-08-01), Clark
patent: 3775091 (1973-11-01), Clites
patent: 4058668 (1977-11-01), Clites
patent: 4738713 (1988-04-01), Stickle
Cold-Crucible Induction Melting of Reactive Metals, G. H. Schippereit et al, 2-61, pp. 140-143.
Induction Heating Process for Melting Titanium, Reactive Metals, Inc. 7-64.
Preparation of Ingots & Shaped Castings by Inductoslag Melting, 10-16, 18-74, P. G. Clites and R. A. Beall.
The Inductoslag Melting Process, P. G. Clites, 1982, pp. 6-10, FIGS. 1-4, 6-10, 12, 14-16, 19 and 20.
Inductoslag Melting of Titanium, 1969, P. G. Clites and R. A. Beall, FIGS. 1-4.
Diehm Randall S.
Zuidema Blake K.
Howmet Corporation
Rosenberg Peter D.
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