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GB803746A - Improvements in and relating to methods of zone heating materials - Google Patents

Improvements in and relating to methods of zone heating materials

Info

Publication number
GB803746A
GB803746A GB2457056A GB2457056A GB803746A GB 803746 A GB803746 A GB 803746A GB 2457056 A GB2457056 A GB 2457056A GB 2457056 A GB2457056 A GB 2457056A GB 803746 A GB803746 A GB 803746A
Authority
GB
United Kingdom
Prior art keywords
ingot
conductors
grid
cathode
interleaved
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
GB2457056A
Inventor
William Joseph Scott
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.)
British Thomson Houston Co Ltd
Original Assignee
British Thomson Houston Co Ltd
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 British Thomson Houston Co Ltd filed Critical British Thomson Houston Co Ltd
Priority to GB2457056A priority Critical patent/GB803746A/en
Publication of GB803746A publication Critical patent/GB803746A/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
    • C30B13/06—Single-crystal growth by zone-melting; Refining by zone-melting the molten zone not extending over the whole cross-section

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Silicon Compounds (AREA)

Abstract

<PICT:0803746/III/1> In the zone-refining of an ingot of silicon, molten zones are produced by electron bombardment which is restricted to defined zones of the surface of the ingot by means of at least one negatively charged electrode acting as a grid placed between the heater cathode and the ingot. As shown, the ingot 1 is mounted between clamps 2 supported on pillars 3 and cross-members 4 inside an evacuable chamber comprising a cylindrical wall 5, base 6 with vacuum connection 9 and removable cap 7, suitable gaskets 8 being provided at the ends of the cylindrical wall 5. A carriage 10, supporting ring-shaped cathode heater 11 and the grid 12, is slidably mounted on the pillars 3 and can be moved along the axis of the ingot by spindles 13 passing through vacuum-tight glands 14 in the base 6. The molten zones, which are strengthened by the longitudinally extending portions of un-melted material, are moved around the ingot either by rotating the ingot or by providing a second grid, the conductors of which are interleaved with those of the first, and applying the negative potential to the two grids in succession. In an alternative construction, the cathode may be in the form of conductors having their axes parallel to that of the ingot and angularly spaced round the ingot, the grid conductors being positioned between or interleaved with the conductors of the cathode.
GB2457056A 1956-08-10 1956-08-10 Improvements in and relating to methods of zone heating materials Expired GB803746A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2457056A GB803746A (en) 1956-08-10 1956-08-10 Improvements in and relating to methods of zone heating materials

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2457056A GB803746A (en) 1956-08-10 1956-08-10 Improvements in and relating to methods of zone heating materials

Publications (1)

Publication Number Publication Date
GB803746A true GB803746A (en) 1958-10-29

Family

ID=10213722

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2457056A Expired GB803746A (en) 1956-08-10 1956-08-10 Improvements in and relating to methods of zone heating materials

Country Status (1)

Country Link
GB (1) GB803746A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3156753A (en) * 1961-09-19 1964-11-10 Heraeus Gmbh W C Melting furnace for metals
US3249797A (en) * 1962-04-06 1966-05-03 Stauffer Chemical Co Electron discharge furnace for heating conductive rods

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3156753A (en) * 1961-09-19 1964-11-10 Heraeus Gmbh W C Melting furnace for metals
US3249797A (en) * 1962-04-06 1966-05-03 Stauffer Chemical Co Electron discharge furnace for heating conductive rods

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