Apparatus for producing monocrystals

Details Apparatus for producing monocrystals Apparatus for producing monocrystals

1976-04-12

1978-03-14

Emery, Stephen J.

Chemistry: physical processes

Physical processes

Crystallization

23273SP, 156620, 269275, 269 22, 156DIG98, B01J 1710

Patent

active

040788970

ABSTRACT:
Apparatus for producing monocrystals by potless zone melting, in which the monocrystal, setting out from a seed crystal, passes through a neck and a transitional zone into the main part of the monocrystal. A chamber is provided for the formation of a vacuum or a protective gas atmosphere plus a heating device for the production of the melting heat, driving means for the mechanical movements necessary for the crystal formation, a mounting for the seed crystal, and a supporting device which is applicable to the monocrystal beyond the neck, and a plurality of gripping bodies distributed about the circumference and applicable to the monocrystal radially on its substantially cylindrical surface the gripping bodies are disposed such that they first perform a radial approach to the monocrystal until a virtually force-free contact is made therewith, adapting themselves to the surface geometry and position of the monocrystal, whereupon the gripping force is increased and the gripping bodies are locked.

REFERENCES:
patent: 2826420 (1958-03-01), Klingler
patent: 2876147 (1959-03-01), Kniepkamp
patent: 3159408 (1964-12-01), Sanchez
patent: 3189415 (1955-06-01), Emeis
patent: 3222747 (1965-12-01), Meadows
patent: 3259468 (1966-07-01), Stevens
patent: 3428436 (1969-02-01), Tucker
patent: 3522014 (1970-07-01), Keller
patent: 3668359 (1972-06-01), Emmerson
patent: 3972684 (1976-08-01), Defosse

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