Thermodynamic evaluation of oxygen behavior in Ti powder deoxidized by Ca reductant

Sun Joong Kim, Jung Min Oh, Jae Won Lim

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

To produce low oxygen Ti powder of less than 1000 mass ppm, commercial Ti powder was deoxidized by two types of Ca reductants: a solid Ca and a Ca vapor. Compared with the iso-oxygen partial pressure in the Ti-O binary phase diagram, the PO2 in the raw Ti powder increased with temperature compared to the reduction reaction of Ca. Therefore, the O2 content in the Ti powder decreased as the deoxidation temperature increased from 873 K, showing a local minima at 1273 K. The oxygen concentration at 1373 K was greater than that at 1273 K because the oxygen solubility of the Ti powder was increased by the equilibrium relation between Ca and CaO. On the basis of the thermodynamic assessment, the deoxidation of Ti powder can be improved by increasing the temperature and lowering the oxygen solubility with the saturation of CaO.

Original languageEnglish
Pages (from-to)658-662
Number of pages5
JournalMetals and Materials International
Volume22
Issue number4
DOIs
Publication statusPublished - 2016 Jul 1

Keywords

  • calcium
  • deoxidation
  • metals
  • powder processing
  • titanium

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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