A new matched thermochemical diagram for vacuum refining of nickel and cupronickel alloys

Seetharaman, S and Jacob, KT (1993) A new matched thermochemical diagram for vacuum refining of nickel and cupronickel alloys. In: Proceedings of the Paul E. Queneau International Symposium on 'Extractive Metallurgy of Copper, Nickel and Cobalt, 1993.

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Abstract

Sulfur and oxygen dissolved in nickel and cupronickel melts can be remwed as gaseous oxides of sulfur by a vacuum treatment. Presented in this paper is a new matched thermcxhemical disgran~ that permit.. direct evaluation of the equilibrium partial pressure of SO, as a function of temperature wer an alloy of specified compition. The matched thermochemical diagram consists of a central plot which shows the integral Gibbs' energy of mixing for the binary system SO, at different temperatures. The central plot is flanked on either side by terminal plots of the chemical potentials of oxygen and sulfur, as functions of temperature, for different alloy compositions. By projecting the chemical wtentials of oxygen and sulfur from the terminal lots on to the central diagram, ihe equilibrium partial pressure of S0,can be directly ;cad on the nomograms on the central plot at different temperatures. The matched therrnochemical diagrams are useful in assuring the efficiency of vacuum refining.

Item Type:	Conference Paper
Publisher:	The Minerals, Metals & Materials Society
Additional Information:	Copyright of this article belongs to The Minerals, Metals & Materials Society.
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	09 Dec 2011 10:24
Last Modified:	09 Dec 2011 10:24
URI:	http://eprints.iisc.ac.in/id/eprint/42683

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