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Processes for the continuous preparation of single crystals

  • US 4,565,600 A
  • Filed: 05/11/1983
  • Issued: 01/21/1986
  • Est. Priority Date: 04/27/1981
  • Status: Expired due to Fees
First Claim
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1. A continuous process for the preparation of single crystals having a predetermined shape, which process comprises:

  • (a) charging the crystal-forming material to a crucible tapped in its lower region by a capillary conduit with a height greater than or equal to the retention height of the melted crystal-forming material in the capillary at the temperature and pressure used,(b) bringing th crystal-forming material to a temperature above its melting point so as to form a drop at the lower end of the capillary,(c) contacting a preformed seed crystal having a selected crystal orientation with the drop, and(d) pulling the seed crystal in contact with the drop downwardly away from the crucible to form a single crystal, at a growth front between the crystal and the melted crystal-forming material, the quantity of crystal-forming material fed per unit of time being substantially equal to the amount of material pulled into the single crystal and the force at the growth front being substantially nil.

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