中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 36 No. 3 March 2026 |
（a Key Laboratory for Nonferrous Vacuum Metallurgy of Yunnan Province, Kunming University of Science and Technology, Kunming 650093, China;
b National Engineering Research Center of Vacuum Metallurgy, Kunming University of Science and Technology, Kunming 650093, China;
c Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China;
d State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming 650093, China）
Abstract:The modified molecular interaction volume model (M-MIVM) was used to calculate the activity values and their deviations from experimental data for Ag-Cu and Ag-Sb binary alloys. Subsequently, theoretical vapor-liquid equilibrium phase diagrams (T-x-y and p-x-y) were plotted via combining M-MIVM and vacuum theory. The vapor-liquid phase equilibrium (VLE) experiments were conducted on the Ag-Cu alloy at 1500-1560 K and 10-15 Pa and Ag-Sb alloys at 950-1350 K and 10 Pa. The results showed that the average relative deviation and average standard deviation of activity were lower than 5% and 0.02, respectively. A comparison of theoretical and experiment results for VLE revealed that the simulated data on the T-x-y diagram were well consistent with experimental values. Therefore, the VLE phase diagrams can serve as a guide in vacuum separation experiments and industrial production for Ag-Cu and Ag-Sb binary alloys.
Key words: Ag-Cu binary alloy; Ag-Sb binary alloy; modified molecular interaction volume model (M-MIVM); vapor-liquid phase equilibrium; activity
