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ISSN Online: 2377-424X

ISBN Print: 1-56032-797-9

International Heat Transfer Conference 11
August, 23-28, 1998, Kyongju, Korea

EFFECTS OF PULLING VELOCITY ON INTERFACE DYNAMICS AND SOLUTE SEGREGATION DURING CRYSTAL GROWTH

Get access (open in a dialog) DOI: 10.1615/IHTC11.1170
pages 253-258

Abstract

Two of the most commonly used techniques for the growth of single crystals are Bridgman and Czochralski methods. It is well-known that the temperature and concentration distributions and the shape and location of the solid/liquid interface during the growth process significantly influence the quality of the crystal. In this work, the MASTRAPP (multizone adaptive scheme for transport and phase-change processes) scheme has been employed for dynamic simulation of the Bridgman and Czochralski growth.
Interface dynamics and concentration distribution have been studied for various values of Grashof number and pull rate during the Bridgman growth. The shapes of the crystal, the solid/melt interface, and the free surface are obtained together with heat transfer in the system and thermal stresses in the crystal. A dramatic change in the shape of the crystal as it is pulled is demonstrated for the Czochralski growth.