Formation of anatase on commercially pure Ti by two-step thermal oxidation using N2-CO gas

Nobuyuki Umetsu, Shota Sado, Kyosuke Ueda, Kazuki Tajima, Takayuki Narushima

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

The phase of a TiO2 layer formed on commercially pure Ti by two-step thermal oxidation using N2-CO gas was investigated. The oxidation process comprised two steps: treatment in an N2-(0.1, 1 and 5)%CO atmosphere and treatment in air. ATi(C,N,O) phase was formed after the first-step treatment conducted at 873-1123 K. In the second step, the oxidation of this phase at 573-773 K resulted in the formation of an anatase phase, while its oxidation at 873K resulted in the formation of a single rutile phase. An increase in the CO partial pressure in the first step lowered the temperature for anatase phase formation. Further, in the second step, a single-phase anatase layer was formed at temperatures of 623 and 673 K.

Original languageEnglish
Pages (from-to)1302-1307
Number of pages6
JournalMaterials Transactions
Volume54
Issue number8
DOIs
Publication statusPublished - 2013

Keywords

  • Anatase
  • Carbide
  • Thermal oxidation
  • Titania
  • Two-step treatment

ASJC Scopus subject areas

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

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