用NRTL方程预测三元、四元液态合金体系的热力学数据

PREDICATION OF THERMODYNAMICS DATA OF TERNARY AND QUATERNARY MOLTEN ALLOYS WITH NRTL EQUATION

ＮＲＴＬ方程是在化工热力学中广泛应用的方程之一它的显著优点是可以仅用二元系数据预测三元系热力学性质但该方程 对于冶金过程中的液态合金及其它熔体的应用还极少见到本文用 ＮＲＴＬ方程关联了 Ｃｄ－Ｂｉ－Ｓｎ，Ｃｄ－Ｂｉ－Ｐｂ，Ｃｄ－Ｓｎ－Ｐｂ液 态合金体系所涉及的二元系活度系数数据，并对三元系活度数据和Ｃｄ－Ｂｉ－Ｐｂ－Ｓｎ四元系中Ｃｄ的活度进行了预测．

NRTL equation is one of the equations that widely used in chemical engineering thermodynamics. The marked advantage of the NRTL equation is that it can be used for predicting the thermodynamics properties of multi-component systems only with the data of binary systems. However, the application of it to molten alloys and the other melts in metallurgy has been rarely reported. In this article, it was used to correlate thermodynamics data of binary molten alloys which are included in the systems Cd-Bi-Sn, Cd-Bi-Pb and Cd-Sn-Pb. The data of those ternary systems are predicted by NRTL equation. The activities of Cd in quaternary system Cd-Bi-Pb-Sn are also calculated.