Formation of Anatase on Commercially Pure Ti by Two-Step Thermal Oxidation Using N<sub>2</sub>–CO Gas

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  • Umetsu Nobuyuki
    Department of Materials Processing, Tohoku University
  • Sado Shota
    Department of Materials Processing, Tohoku University
  • Ueda Kyosuke
    Department of Materials Processing, Tohoku University
  • Tajima Kazuki
    Materials Research Institute for Sustainable Development, National Institute of Advanced Industrial Science and Technology (AIST)
  • Narushima Takayuki
    Department of Materials Processing, Tohoku University

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  • Formation of Anatase on Commercially Pure Ti by Two-Step Thermal Oxidation Using N2–CO Gas
  • Formation of Anatase on Commercially Pure Ti by Two-Step Thermal Oxidation Using N<sub>2</sub>&ndash;CO Gas

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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. A Ti(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 873 K 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.

Journal

  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 54 (8), 1302-1307, 2013

    The Japan Institute of Metals and Materials

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