Oxidation of Metals

, Volume 9, Issue 5, pp 415–425 | Cite as

Study of the oxidation kinetics of vanadium carbide

  • C. Santafé
  • C. Borgianni


The oxidation of an oxycarbide of vanadium, VO0.6C0.7, and of a vanadium carbide, VC0.98, was studied athermally up to temperatures of 800° C and isothermally between 400 and 580° C at oxygen pressures ranging from 10−2 to 1 atm. The oxycarbide followed the parabolic rate law below 450° C with V2O5 forming as the only reaction product. The activation energy was 49 kcal/mole. VC0.98 did not form an oxide in this temperature range, but rather dissolved oxygen, the activation energy being 26.6 kcal/mole. No oxygen pressure dependence on the kinetics was found for either sample in this temperature range. Both samples followed the cubic rate law during oxidation in the range of 500–580° C during which V2O5 formed. There was a P1/3 dependence and the activation energy was the same for both materials, 51 kcal/mole. The cubic rate law and the positive pressure dependency (rather than an anticipated negative dependency) were attributed to an electric field associated with oxygen ions chemisorbed on a thin layer of V2O5.

Key words

vanadium carbide vanadium oxycarbide oxidation parabolic rate law cubic rate law chemisorption 


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    C. Borgianni, V. Di Stefano, and R. Grimaldi,J. Less-Common Met. 20, 299 (1970).Google Scholar
  2. 2.
    P. Kofstad,High Temperature Oxidation of Metals (John Wiley & Sons, New York, 1968).Google Scholar
  3. 3.
    W. J. Moore and J. K. Lee,Trans. Faraday Soc. 47, 501 (1951).Google Scholar
  4. 4.
    H. J. Engell and K. Hauffe,Metallwirtsch. 6, 285 (1952).Google Scholar

Copyright information

© Plenum Publishing Corporation 1975

Authors and Affiliations

  • C. Santafé
    • 1
  • C. Borgianni
    • 1
  1. 1.Centro Sperimentale MetallurgicoSPARomeItaly

Personalised recommendations