Metallurgical and Materials Transactions A

, Volume 27, Issue 7, pp 1919–1924

Gibbs energies of formation of chromium carbides

Authors

  • S. Anthonysamy
    • Indira Gandhi Centre for Atomic Research
  • K. Ananthasivan
    • Indira Gandhi Centre for Atomic Research
  • I. Kaliappan
    • Indira Gandhi Centre for Atomic Research
  • V. Chandramouli
    • Indira Gandhi Centre for Atomic Research
  • P. R. Vasudeva Rao
    • Indira Gandhi Centre for Atomic Research
  • C. K. Mathews
    • Indira Gandhi Centre for Atomic Research
  • K. T. Jacob
    • Department of MetallurgyIndian Institute of Science
Physical Chemistry

DOI: 10.1007/BF02651941

Cite this article as:
Anthonysamy, S., Ananthasivan, K., Kaliappan, I. et al. MMTA (1996) 27: 1919. doi:10.1007/BF02651941

Abstract

The carbon potentials corresponding to the two-phase mixtures Cr + Cr23C6, Cr23C6 + Cr7C3, and Cr7C3 + Cr3C2 in the binary system Cr-C were measured in the temperature range 973 to 1173 K by using the methane-hydrogen gas equilibration technique. Special precautions were taken to prevent oxidation of the samples and to minimize thermal segregation in the gas phase. The standard Gibbs energies of formation of Cr23C6, Cr7C3, and Cr3C2 were derived from the measured carbon potentials. These values are compared with those reported in the literature. The Gibbs energies obtained in this study agree well with those obtained from solid-state cells incorporating CaF2 and ThO2(Y2O3) as solid electrolytes and sealed capsule isopiestic measurements reported in the literature.

Copyright information

© The Minerals, Metals & Material Society 1996