Journal ArticleDOI
Gibbs energies of formation of chromium carbides
S. Anthonysamy,K. Ananthasivan,I. Kaliappan,V. Chandramouli,P.R. Vasudeva Rao,C.K. Mathews,K. T. Jacob +6 more
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TLDR
In this article, the carbon potentials corresponding to the two-phase mixtures Cr + Cr23C6, Cr 23C6 + Cr7C3, and Cr 7C3 + Cr3C2 were measured in the temperature range 973 to 1173 K by using the methane-hydrogen gas equilibration technique.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.read more
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References
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Book
Binary alloy phase diagrams
TL;DR: Binary Alloy Phase Diagrams, Second Edition, Plus Updates, on CD-ROM offers you the same high-quality, reliable data you'll find in the 3-volume print set published by ASM in 1990.
Journal ArticleDOI
High-temperature thermodynamic properties of the chromium carbides determined using the torsion-effusion technique
A. D. Kulkarni,W. L. Worrell +1 more
TL;DR: In this paper, a torsion-effusion technique was used to measure the pressure of carbon monoxide in equilibrium with a Cr23C6-Cr2O3-Cr mixture and a Cr7C3-C2O 3-Cr 23C6 mixture at temperatures between 1100 and 1300 K.
Journal ArticleDOI
Calculation and evaluation of the gibbs energies of formation of Cr 3 C 2 , Cr 7 C 3 , and Cr 23 C 6
TL;DR: In this paper, a thermodynamic analysis of chemical composition data for a series of iron alloys containing chromium and carbon has been completed, when supplemented with thermochemical data from the literature.
Journal ArticleDOI
Enthalpies of formation of chromium carbides
W. M. Dawson,F. R. Sale +1 more
TL;DR: In this article, the enthalpies of combustion of the chromium carbides Cr23C6, Cr7C3 and Cr3C2 were calculated using standard data for Cr2O3 and CO2.
Journal ArticleDOI
High temperature thermodynamic properties of the chromium carbides Cr7C3 and Cr3C2 determined using a galvanic cell technique
R. G. Coltters,G. R. Belton +1 more
TL;DR: In this article, the standard free energies of formation of Cr7C3 and Cr3C2 have been obtained from emf measurements on the following galvanic cells with BaF2-BaC2 solid solutions as the electrolyte.