Chemistry: physical processes – Physical processes – Crystallization
Patent
1975-04-14
1977-09-20
Wolk, Morris O.
Chemistry: physical processes
Physical processes
Crystallization
13 6, 13 26, 13 27, 156617SP, 219 1049, B01D 900, B01J 1718, B01J 1720
Patent
active
040493849
ABSTRACT:
A cold crucible system is provided which is suitable for carrying out the process of "skull" melting wherein highly refractory materials are melted by inductive heating in a manner to maintain the molten material in a shell of the material cool enough to act as a crucible. The cold crucible system incorporates a crucible formed as two separate halves held in a manner to define a narrow electrically insulating space between them. Each half section comprises a plurality of copper tubes forming half of a "cage." Each tube of the cage has a concentric smaller tube therein whereby there are defined in each tube an outer annular and a central inner fluid passage through which a fluid coolant is circulated. The system is formed as a module capable of being located within a controlled atmosphere chamber. The crucible system is readily adapted to Czochralski crystal growth, for use with a seed crystal to induce directional crystal growth by the Bridgeman technique and to centrifugal casting.
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Fifth International Symposium of Electroslag and Other Melting Tech., Part II, pp. 460-819 (476-497) Oct. 10, 1974.
Castonguay Roger A.
Menashi Wilson P.
Wenckus Joseph F.
Arthur D. Little Inc.
Lepper Bessie A.
Marcus Michael S.
Wolk Morris O.
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