Formation of titania photocatalyst films by microarc oxidation of Ti and Ti-6Al-4V alloys

Young Keun Shin, Won Seok Chae, Yong Won Song, Yun Mo Sung

Research output: Contribution to journalArticle

76 Citations (Scopus)

Abstract

Microarc oxidation (MAO) was performed for pure Ti and Ti-6Al-4V alloys, respectively to evolve porous titanium oxide (TiO2:titania) films at their surfaces. X-ray diffraction (XRD) analysis results reveal that TiO 2 films formed on pure Ti and Ti-6Al-4V alloys have high content of anatase with small content of rutile phases, which would be ideal for high-performance photocatalytic properties. The rutile content was gradually increasing with MAO time period for Ti alloys, while that was almost constant value of 10 vol% for pure Ti. Scanning electron microscopy (SEM) images of the films show uniformly distributed pores for both pure Ti and Ti-6Al-4V alloys. The pore density was higher for pure Ti from 10 min MAO and the pore size became larger for Ti-6Al-4V alloys after 40 min MAO. Microarc oxidized pure Ti showed relatively higher photodecomposition efficiency compared to Ti-6Al-4V alloys, possibly due to the large surface area coming from high porosity and optimum composition of anatase and rutile phases.

Original languageEnglish
Pages (from-to)465-470
Number of pages6
JournalElectrochemistry Communications
Volume8
Issue number3
DOIs
Publication statusPublished - 2006 Mar 1

Keywords

  • Microarc oxidation
  • Phase transformation
  • Photocatalyst
  • Titania
  • Titanium

ASJC Scopus subject areas

  • Electrochemistry

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