Bi-Pb合金熔体作用浓度计算模型  

A Model for Calculating Mass Action Concentrations for the Alloy Melt Bi-Pb

作　　者：成国光[1] 张鉴[1] 

机构地区：[1]北京科技大学,北京100083

出　　处：《上海金属（有色分册）》1993年第4期17-20,共4页

摘　　要：根据含化合物金属熔体共存理论,结合相图和有关的实验结果,确定Bi-Pb合金熔体的结构单元为Bi原子、Pb原子以及PbBi分子,从而推导了该熔体的作用浓度计算模型。模型计算的N_(Bi)和N_(Pb)与实测的活度值完全符合。同时求得了生成PbBi化合物的lgK～T和相应的△G°～T的关系式为:lgK_(PbBi)=451.098/T_(K)-0.5853△G°_(PbBi)=8642.610-11.2138T_(K)J/mol}(700～1223K)Based on the coexistence theory of metallic melt structure involved with formation of compound,Bi-Pb phase diagram and concerned experimental results,the structure units of this melt are determined as atoms Bi,Pb and compound PbBi.Then the calculating model of mass action concentrations is deduced.And the calculated N_(Bi),N_(pb)are in good agreement with measured a_(Bi),a_(pb).Furthermore,lgK_(phBi)～T and ΔG°_(pbBi)～T relations are also deter- mined to be: (?)

关 键 词：铋基合金 熔体 浓度 

分 类 号：TG146.17[一般工业技术—材料科学与工程]