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| A STUDY OF EQUILIBRIUM OF Y-S IN MOLTEN Ni~+ |
| WANG Longmei; DU Ting (Central Iron and Steel Research Institute; Ministry of Metallurgical Industry; Beijing) (Manuscript received 1 August; 1983; revised manuscript 26 November; 1983) |
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Cite this article:
WANG Longmei; DU Ting (Central Iron and Steel Research Institute; Ministry of Metallurgical Industry; Beijing) (Manuscript received 1 August; 1983; revised manuscript 26 November; 1983). A STUDY OF EQUILIBRIUM OF Y-S IN MOLTEN Ni~+. Acta Metall Sin, 1984, 20(4): 286-295.
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Abstract Desulphurization equilibria between Y-S in molten Ni at 1500, 1550 and 1600℃ have been determined and studied thermodynamically. The results are summarized as follows: 1. Temperature dependence of desulphurization constant for the formation of Y-S_(S) as the equilibrium phase in the temperature range of 1500—1600℃ is given by lg K_(YS)=47000/T+20.86 2. Temperature dependences of the first activity interaction parameters between Y and S in liquid Ni are determined to be e_S~Y=350200/T+179 in the temperature range of 1500—1600℃. 3. Temperature dependence of the standard free energy of formation of YS_(S) in liquid Ni is derived to be [Y]_(Ni)+[S]_(Ni)=YS_(S) △G°=-215000+95.53T cal/mol 4. Temperature dependence of the standard free energy of solution of Y in liquid Ni is derived to be Y_(1)=[Y]_(Ni) △G°=126200-79.31T cal/mol 5. Temperature dependences of activity coefficient and selfinteraction coefficient of Y in liquid Ni are derived to be lgγ_Y~0=27584/T-15.151 ∑_Y~Y=-127052/T+69.79 e_Y~Y=-364.8/T+0.2018 6. The minimum content of S in equilibria with Y in liquid Ni in the temperature range of 1500-1600℃ are given ~*[％S]=0.002-0.005 and ~*[％Y]=0.005-0.020. The S content raises with Y when exceed this minimum point.
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Received: 18 April 1984
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