Convectional controlled crystal-melt interface using two-phase radio-frequency electromagnetic heating

R. Hermann, G. Gerbeth, J. Priede, A. Krauze, G. Behr, B. Büchner

    Research output: Contribution to journalArticlepeer-review

    4 Citations (Scopus)


    The radio frequency floating-zone growth of massive intermetallic single crystals is very often unsuccessful due to an unfavourable solid-liquid interface geometry enclosing concave fringes. This interface depends on the flow in the molten zone. A tailored magnetic two-phase stirrer system has been developed which enables the controlled influence on the melt flow ranging from intense inwards to outwards flows. Depending on the phase shift between the two induction coils, a transition from a double vortex structure to a single vortex structure is created at a preferable phase shift of 90°. This change in the flow field has a significant influence on the shape of the solid-liquid interface. Due to their attractive properties for high temperature applications such as high melting temperature, low density, high modulus and good oxidation resistance, the magnetic system was applied to the crystal growth of TiAl alloys.

    Original languageEnglish
    Pages (from-to)2228-2232
    Number of pages5
    JournalJournal of Materials Science
    Issue number8
    Early online date22 Dec 2009
    Publication statusPublished - Apr 2010

    ASJC Scopus subject areas

    • Materials Science(all)
    • Mechanics of Materials
    • Mechanical Engineering


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