1988 年 28 巻 9 号 p. 721-727
Equilibrium between solid Fe-Cr alloy and H2-H2S gas mixture was measured by the gas circulating method to determine the activity of sulfur in the alloy at 1573K.
An isothermal section of the Fe-Cr-S system at 1573K was experimentally determined over the metal/sulfide equilibrium region with the conventional silica capsule technique. The thermodynamic evaluation procedure on the basis of the modified Gibbs-Duhem integration was applied to the tie-line distribution and the phase relations obtained experimentally, which results in a stability diagram, revealing the stable fields of the metal and sulfide phases as functions of the partial pressure of sulfur and the metal ratio. The solubility of sulfur in the Fe-Cr alloy was also determined.
