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Interfacial phenomena in the reactions of AI and Al-Ti melts with KF-AIF3 and NaF-AIF3 melts

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Abstract

The interfacial phenomena occurring during the contacting of Al and Al-Ti melts with KF-AlF3 liquid fluxes have been investigated by optical examination of quenched metal drops previously immersed in the liquid fluxes. A range of temperatures between 690 °C and 840 °C was em-ployed. Reactions in the Al-Ti/KF-AlF3 system involve the formation of TiAl3 at the metal/ flux interface. This TiAl3 is wetted by the KF-AlF3 melt, and at 690 °C the TiAl3 is dispersed in the KF-AlF3. At 720 °C and above, a metal/flux emulsion is found in which there are high levels of K2TiF6 in the flux as a result of the dispersion of the TiAl3 surface layer in the flux. At low K2TiF6 levels, the TiAl3 is dispersed in the metal. Addition of Mg or Ca to the system in the form of MgF2 or CaF2 has been found to inhibit the formation of TiAl3, thus also inhibiting the metal/flux emulsification. A certain critical level of Mg or Ca is required to prevent emul-sification. The results obtained for the Al-Ti/NaF-AlF3 system were in all cases similar to those found for the Al-Ti/KF-AlF3 system.

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Authors and Affiliations

  1. BHP Research, Newcastle, Australia

    M. S. Lee (Research Officer)

  2. Department of Materials, Imperial College, SW7 2BP, London, UK

    B. S. Terry (Lecturer) & P. Grieveson (Professor of Applied Metallurgy)

Authors
  1. M. S. Lee
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  2. B. S. Terry
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  3. P. Grieveson
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Additional information

M.S. LEE, formerly Graduate Student, Department of Materials, Imperial College, London.

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Lee, M.S., Terry, B.S. & Grieveson, P. Interfacial phenomena in the reactions of AI and Al-Ti melts with KF-AIF3 and NaF-AIF3 melts. Metall Trans B 24, 955–961 (1993). https://doi.org/10.1007/BF02660987

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  • DOI: https://doi.org/10.1007/BF02660987

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