溶融Cu-Pb-BiおよびCu-Pb-Sn系合金の1, 100℃における活量

溶融銅合金に関する熱力学的研究 (第6報)

抄録

Activity of each component in liquid copper-lead-bismuth and copper-lead-tin ternary systems has been determined by the use of transportation method at 1, 100°C.
Vapor pressures of lead and bismuth were simultaneously determined by the chemical analysis of the condensate transpired from the copper-lead-bismuth system. The activities of bismuth measured were in good agreement with those calculated from the Gibbs-Duhem equation by using the activities of lead measured.
On the other hand, the activities of lead for the copper-lead-tin system showed a plateau in the range of concentration 0.2 to 0.6 in NPb along the line of N_cu/N_sn=7. The activities of copper and tin in the copper-tin binary system estimated from the data of ternary system fairly well agreed with the results reported in the previous paper.
The interaction parameters which are representing the effect of lead, bismuth, and tin on the activity of lead in adilute copper base solution were estimated to be:ε(Pb)/Pb=-3.6, ε(Bi)/Pb=-2.6, ε(sn)/Pb =+3.3 (1, 100°C).