GB911515A - Improvements in or relating to the purification of materials by the zone melting method - Google Patents

Improvements in or relating to the purification of materials by the zone melting method

Info

Publication number
GB911515A
GB911515A GB3534860A GB3534860A GB911515A GB 911515 A GB911515 A GB 911515A GB 3534860 A GB3534860 A GB 3534860A GB 3534860 A GB3534860 A GB 3534860A GB 911515 A GB911515 A GB 911515A
Authority
GB
United Kingdom
Prior art keywords
control device
rod
coil
holder
rotation
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB3534860A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CKD Praha DIZ AS
Original Assignee
CKD Praha DIZ AS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by CKD Praha DIZ AS filed Critical CKD Praha DIZ AS
Publication of GB911515A publication Critical patent/GB911515A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C30—CRYSTAL GROWTH
    • C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
    • C30B13/00—Single-crystal growth by zone-melting; Refining by zone-melting
    • C30B13/28—Controlling or regulating

Abstract

<PICT:0911515/III/1> In the zone-melting of a silicon rod by means of an induction heating coil, the heating effect of the coil is first automatically increased by means of a control device to form a molten zone, whereupon commencement of rotation of the lower end of the rod as a result of a torque applied continuously thereto actuates the control device to cause relative upward movement of the coil with respect to the rod, and an initial stretching and a final compression of the two ends of the rod. The control device may be actuated, by commencement and termination, respectively, of the rotation, to effect alternate decrease and increase in the heating effect of the coil. As shown, a rod is held between holders 15 and 17 in a frame 3 which is vertically movable by means of a driving device 16 actuated by control device 22, and the molten zone is formed at the lower end of the rod by means of a stationary induction coil 5 connected to a generator 24, a transformer 23, and control device 22. Holder 17 is capable of vertical movement in frame 3 by the action of a motor 18 operated by control device 22, and holder 15 forms a friction coupling with a continuously rotating sleeve 12. On formation of the molten zone and consequent rotation of holder 15, light passing from a source 20 is intermittently cut off from a photo-electric cell 21 by rotation of an apertured wheel 19 connected to holder 15 and control 22 is thereby actuated to effect upward passage of the molten zone. Commencement and termination of the operation is effected by engagement of a stop 25 on frame 3 with limit switches 26 and 27 connected to control device 22. The operation may be repeated.
GB3534860A 1959-10-19 1960-10-14 Improvements in or relating to the purification of materials by the zone melting method Expired GB911515A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CS594959 1959-10-19

Publications (1)

Publication Number Publication Date
GB911515A true GB911515A (en) 1962-11-28

Family

ID=5405437

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3534860A Expired GB911515A (en) 1959-10-19 1960-10-14 Improvements in or relating to the purification of materials by the zone melting method

Country Status (1)

Country Link
GB (1) GB911515A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4080172A (en) * 1975-12-29 1978-03-21 Monsanto Company Zone refiner automatic control
US4176002A (en) * 1974-08-21 1979-11-27 Agence Nationale De Valorisation De La Recherche (Anvar) Controlling the melt temperature during zone refining and Czochralski crystal growth by sensing the viscous torque of the melt zone during operation

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4176002A (en) * 1974-08-21 1979-11-27 Agence Nationale De Valorisation De La Recherche (Anvar) Controlling the melt temperature during zone refining and Czochralski crystal growth by sensing the viscous torque of the melt zone during operation
US4080172A (en) * 1975-12-29 1978-03-21 Monsanto Company Zone refiner automatic control

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