Initial stages of oxidation of near-stoichiometric titanium carbide at low oxygen pressures

I. L. Shabalin, V. M. Vishnyakov, D. J. Bull, S. G. Keens, L. F. Yamshchikov, L. I. Shabalin

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

A novel approach to the oxidation mechanism of near-stoichiometric TiC is presented. It is confirmed by consideration of solid-state chemical kinetics model and electron microscopy observations in parallel. At low oxygen pressures and moderate temperatures the initial step of the process is connected with the dissolution of oxygen and subsequent decomposition of oxygen-oversaturated oxycarbide, which ultimately results in the nucleation of oxide phase, in particular anatase, belike stabilised by residual carbon. An anatase-rutile transformation is concurrent with deeper carbon burn-off in the oxide scale, which sinters at higher temperatures. This mechanism shifts the process to a gas diffusion regime, governed by the scale permeability, but determined by solid-state diffusion that is reflected in the kinetics, as further temperature increase is accompanied by a decrease of the oxidation rate, so in general the process is characterised by the negative value of apparent activation energy.

Original languageEnglish
Pages (from-to)373-377
Number of pages5
JournalJournal of Alloys and Compounds
Volume472
Issue number1-2
Early online date17 Jun 2008
DOIs
Publication statusPublished - 20 Mar 2009
Externally publishedYes

Fingerprint

Titanium carbide
Oxygen
Oxidation
Titanium dioxide
Oxides
Carbon
Diffusion in gases
Reaction kinetics
Temperature
Electron microscopy
Dissolution
Nucleation
Activation energy
Decomposition
Kinetics
titanium dioxide
titanium carbide

Cite this

Shabalin, I. L. ; Vishnyakov, V. M. ; Bull, D. J. ; Keens, S. G. ; Yamshchikov, L. F. ; Shabalin, L. I. / Initial stages of oxidation of near-stoichiometric titanium carbide at low oxygen pressures. In: Journal of Alloys and Compounds. 2009 ; Vol. 472, No. 1-2. pp. 373-377.
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Initial stages of oxidation of near-stoichiometric titanium carbide at low oxygen pressures. / Shabalin, I. L.; Vishnyakov, V. M.; Bull, D. J.; Keens, S. G.; Yamshchikov, L. F.; Shabalin, L. I.

In: Journal of Alloys and Compounds, Vol. 472, No. 1-2, 20.03.2009, p. 373-377.

Research output: Contribution to journalArticle

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KW - Kinetics

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KW - Transition metal alloys and compounds

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