Wetting induced by near-surface Ti-enrichment in the CaF2/In-Ti and CaF2/Cu-Ti systems

N. Froumin, S. Barzilai, M. Aizenshtein, M. Lomberg, N. Frage

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

This paper is concerned with the wetting of CaF2 by liquid Cu and In and with the effect of Ti additions to the melt. According to thermodynamic analysis and to the experimental observations, the significantly decreased contact angle following the addition of Ti to the molten metals is not due to the formation of interfacial fluoride phases, in contrast to previously reported results. Ab initio density functional calculations indicate that preferential Ti adsorption takes place at the near CaF2 surface. It is suggested that the presence of a Ti-enriched liquid, adjacent to the substrate, gives rise, by means of heterogeneous nucleation, to the formation of a thin intermetallic compound layer that stands behind the experimentally observed enhanced wetting. The suggested wetting mechanism is supported by the notable correlation that has been observed between the temperature dependence of the contact angle and the temperature domains, associated with the presence of intermetallic compounds in both Me-Ti (Me = Cu, In) binary systems.

Original languageEnglish
Pages (from-to)181-186
Number of pages6
JournalMaterials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
Volume495
Issue number1-2
DOIs
StatePublished - 15 Nov 2008

Keywords

  • CaF
  • Interface interaction
  • Metals
  • Thermodynamic analysis
  • Wetting

ASJC Scopus subject areas

  • Materials Science (all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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