Weak Interaction of Oxygen with Some Refractory Carbides

D. Gozzi, G. Cascino, S. Loreti, C. Minarini, S. Shimada

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Abstract

The reactivity of NbC (single crystal and polycrystalline), TiC (single crystal and polycrystalline), and polycrystalline ZrC in the temperature range from ambient tu 1020°C and at oxygen partial pressures from 0.07 to 9 Pa is reported. The reactivities of the principal (hkl) planes of TiC as well as the polycrystal arc also measured at 0.8 Pa of O2. The reactivity ratio order is 1.0, 1.2, and 1.9, respectively, for (111), 1100), and (110) planes. Under these conditions, laths at right angle of epitaxial rutile were observed. The comparison of the reactivity between NbC(100) and polycrystalline NbC has been determined and some tentative data are given on the reactivities of the other planes. The reactivity at higher oxygen partial pressures was also measured for TiC(111) and in these conditions a well-defined TiC-rutile ceramic to ceramic joint has been obtained. The reactivity and in situ electrical resistivity measurements on polycrystalline TiC and ZrC, both as received and high temperature, high vacuum treated, are presented. Large differences in the reactivity hystereses were found. The same result wax not found in the behavior of the resistivity. © 2001 The Electrochemical Society. All rights reserved.
Original languageEnglish
Pages (from-to)-
JournalJournal of the Electrochemical Society
Volume148
Issue number4
DOIs
Publication statusPublished - Apr 2001
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

Cite this

Gozzi, D., Cascino, G., Loreti, S., Minarini, C., & Shimada, S. (2001). Weak Interaction of Oxygen with Some Refractory Carbides. Journal of the Electrochemical Society, 148(4), -. https://doi.org/10.1149/1.1354606