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Stabilities of ternary carbides UWC1.75 and UWC2

Ananthasivan, K and Kaliappan, I and Anthonysamy, S and Rao, PRV and Mathews, CK and Jacob, KT (1997) Stabilities of ternary carbides UWC1.75 and UWC2. In: High Temperature Materials and Processes, 16 (4). 255-260 .

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The methane-hydrogen gas equilibration technique has been used to measure the chemical potential of carbon associated with two three-phase fields of the system U-W-C in the temperature range 973 to 1173 K. By combining the values of the chemical potential of carbon in the three-phase fields UC + W + UWC1.75 and UC + UWC1.75 + UWC2 Obtained in this study with the data on the Gibbs energy of formation of UC available in the literature, expressions for the Gibbs energies of formation of the two ternary carbides were derived: Delta(f)G degrees [UWC1.75] = -131, 600 - 300 T (+/-8000) J mol(-1) Delta(f)G degrees [UWC2] = -144, 800 - 32.0 T (+/- 10,000) J mol(-1) Although estimates of Gibbs energies of formation of the two ternary carbides TSWC1.75 and UWC2 have been reported, there have been no previous experimental determinations of thermodynamic properties of these compounds.

Item Type: Journal Article
Publication: High Temperature Materials and Processes
Publisher: Freund Publishing House
Additional Information: Copyright of this article belongs to Freund Publishing House.
Keywords: Experimental study;Thermodynamic properties;Gibbs free energy;Heat of formation;Phase diagram;Chemical potential; Uranium Alloys;Tungsten Alloys;Uranium Carbides;Tungsten Carbides;Ternary compound;
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 24 Jun 2011 07:12
Last Modified: 24 Jun 2011 07:12
URI: http://eprints.iisc.ac.in/id/eprint/38477

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