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Reduction of titanium oxide in the presence of nickel by nonequilibrium hydrogen gas

Published online by Cambridge University Press:  31 January 2011

Hidehiro Sekimoto ,
Tetsuya Uda ,
Yoshitaro Nose ,
Shigeo Sato ,
Hiroaki Kakiuchi  and
Yasuhiro Awakura
Hidehiro Sekimoto*
Affiliation:
Department of Materials Science and Engineering, Graduate School of Engineering, Kyoto University, Kyoto 606-8501, Japan
Yoshitaro Nose
Affiliation:
Department of Materials Science and Engineering, Graduate School of Engineering, Kyoto University, Kyoto 606-8501, Japan
Shigeo Sato
Affiliation:
Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
Hiroaki Kakiuchi
Affiliation:
Department of Precision Science and Technology, Division of Precision Science &Technology and Applied Physics, Graduate School of Engineering, Osaka University, Osaka 565-0871, Japan
Yasuhiro Awakura
Affiliation:
Department of Materials Science and Engineering, Graduate School of Engineering, Kyoto University, Kyoto 606-8501, Japan
*
a) Address all correspondence to this author. e-mail: hidehiro.sekimoto@t14.mbox.media.kyoto-u.ac.jp
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Abstract

We investigated the reduction of TiO2 in the presence of Ni by nonequilibrium hydrogen gas, including low-temperature hydrogen plasma at 800 °C and supercooled monatomic hydrogen at 1000 °C. TiO2 was reduced to Ti2O3, which is not in equilibrium phase, by low-temperature hydrogen plasma. The results of x-ray diffraction and energy dispersive x-ray analysis in experiments at 1000 °C indicate that the thermodynamical reduction potential of supercooled monatomic hydrogen is almost the same as atmospheric hydrogen gas. However, the wide Ti3O5 layer formed only in the case of the reduction at 1000 °C by supercooled monatomic hydrogen. With these experimental facts, we speculate that the reduction mechanism by nonequilibrium hydrogen consists of two steps; the releasing energy process and the relaxation process. We can explain the difference of reduction products by nonequilibrium hydrogen gas on the assumption of the rate of the relaxation process between 800 and 1000 °C.

Keywords

Phase equilibriaSurface reactionTi

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Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 7 , July 2009 , pp. 2391 - 2399
Copyright
Copyright © Materials Research Society 2009

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