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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．
The NRTL equation is one of the widely used equations in chemical thermodynamics. It has the significant advantage that it can predict the thermodynamic properties of ternary systems using only binary data. However, the application of this equation to liquid alloys and other melts in metallurgy is still rare See this paper NRTL equations associated with the Cd-Bi-Sn, Cd-Bi-Pb, Cd-Sn-Pb liquid alloy system involved in the binary coefficient of activity data, and ternary activity data and Cd- The activity of Cd in Bi-Pb-Sn quaternary system was predicted.