Metallurgical and Materials Transactions B

, Volume 43, Issue 1, pp 73–81

Effect of Gas Atmosphere on Carbothermal Reduction and Nitridation of Titanium Dioxide

  • Sheikh A. Rezan
  • Guangqing Zhang
  • Oleg Ostrovski
Article

DOI: 10.1007/s11663-011-9574-6

Cite this article as:
Rezan, S.A., Zhang, G. & Ostrovski, O. Metall and Materi Trans B (2012) 43: 73. doi:10.1007/s11663-011-9574-6

Abstract

This article examined the reduction/nitridation of rutile in the He-N2, Ar-N2, and He (Ar)-H2-N2 gas mixtures, as well as pure nitrogen, in the temperature-programmed and isothermal experiments in a fixed-bed reactor. The extents of reduction and nitridation were determined from the off gas composition and LECO analysis. The off-gas composition was monitored using the infrared sensor (CO, CO2, and CH4) and dew point analyzer (H2O). The phase composition of the reduced samples was analyzed using X-ray diffraction (XRD). The temperature and gas composition had a strong effect on the rutile reduction. The reduction was the fastest in the H2-N2 gas mixture, followed by a reduction in nitrogen; the rate of reduction/nitridation in the He-N2 gas mixture was marginally higher than in the Ar-N2 gas. The rate of titania reduction/nitridation in the He (Ar)-H2-N2 gas increased with the replacement of He (Ar) with hydrogen. The article also discusses the mechanisms of reduction/nitridation in different gas atmospheres.

Copyright information

© THE MINERALS, METALS & MATERIALS SOCIETY and ASM INTERNATIONAL 2011

Authors and Affiliations

  • Sheikh A. Rezan
    • 1
    • 2
  • Guangqing Zhang
    • 1
  • Oleg Ostrovski
    • 1
  1. 1.School of Materials Science and Engineering, the University of New South WalesSydneyAustralia
  2. 2.School of Materials & Mineral Resources Engineering, Universiti Sains MalaysiaPenangMalaysia

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