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. // JOURNAL OF ALLOYS AND COMPOUNDS. - 2009. - V. 472, l. 1-2. - P. 373-377.

ISSN/EISSN:

0925-8388 / нет данных

Type:

Article

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-ruble 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. (C) 2008 Elsevier B.V. All rights reserved.

Author keywords:

Transition metal alloys and compounds; Gas-solid reactions; Kinetics; Oxidation; Phase transitions HETERO-MODULUS CERAMICS; REFRACTORY CARBIDES; TEMPERATURE; KINETICS; ANATASE; TIO2

DOI:

10.1016/j.jallcom.2008.04.067

Web of Science ID:

ISI:000264757200070

Соавторы в МНС:

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Другие поля

Поле	Значение
Month	MAR 20
Publisher	ELSEVIER SCIENCE SA
Address	PO BOX 564, 1001 LAUSANNE, SWITZERLAND
Language	English
Keywords-Plus	HETERO-MODULUS CERAMICS; REFRACTORY CARBIDES; TEMPERATURE; KINETICS; ANATASE; TIO2
Research-Areas	Chemistry; Materials Science; Metallurgy \& Metallurgical Engineering
Web-of-Science-Categories	Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy \& Metallurgical Engineering
Author-Email	i.shabalin@salford.ac.uk
ORCID-Numbers	Vishnyakov, Vladimir/0000-0003-3045-3134
Number-of-Cited-References	24
Usage-Count-Last-180-days	1
Usage-Count-Since-2013	25
Journal-ISO	J. Alloy. Compd.
Doc-Delivery-Number	427CK