Wetting behavior of liquid Fe-C-Ti alloys on sapphire

M. Gelbstein, N. Froumin, N. Frage

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Abstract

Wetting behavior in the (Fe-C-Ti)/sapphire system was studied at 1823 K. The wetting angle between sapphire and Fe-C alloys is higher than 90° (93° and 105° for the alloys with 1.4 and 3.6 at.% C, respectively). The presence of Ti improves the wetting of the iron-carbon alloys, especially for the alloys with carbon content of 3.6 at.%. The addition of 5 at.% Ti to Fe-3.6 at.% C provides a contact angle of about 30°, while the same addition to Fe-1.4 at.% C decreases the wetting angle to 70° only. It was established that the wetting in the systems is controlled by the formation of a titanium oxicarbide layer at the interface, which composition and thickness depend on C and Ti contents in the melt. The experimental observations are well accounted for by a thermodynamic analysis of the Fe-Ti-Al-O-C system.

Original languageEnglish
Pages (from-to)159-163
Number of pages5
JournalMaterials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
Volume495
Issue number1-2
DOIs
StatePublished - 15 Nov 2008

Keywords

  • Interface
  • Iron alloys
  • Sapphire
  • Thermodynamic
  • Wetting

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