Cold crucible system

Chemistry: physical processes – Physical processes – Crystallization

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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.

REFERENCES:
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patent: 3156549 (1964-11-01), Kelemen
patent: 3461215 (1969-08-01), Reboux
patent: 3520980 (1970-07-01), Sterling et al.
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patent: 3542521 (1970-11-01), Kulling et al.
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patent: 3702368 (1972-11-01), Hukin
patent: 3759670 (1973-09-01), Rummel
patent: 3824302 (1974-07-01), Alexandrov et al.
patent: 3865554 (1975-02-01), Wenckus et al.
patent: 3898051 (1975-08-01), Schmid
Fifth International Symposium of Electroslag and Other Melting Tech., Part II, pp. 460-819 (476-497) Oct. 10, 1974.

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