Publication Details

Rezan, S. A., Zhang, G. & Ostrovski, O. (2012). Effect of gas atmosphere on carbothermal reduction and nitridation of titanium dioxide. Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science, 43 (1), 73-81.


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.

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