Viscosity of the lead-tin liquid alloys

The capillary method was used in the measurements of the viscosity of the l ead-tin liquid alloys. The experiments were performed for the lead, tin and five lead-tin alloys of the concentration 0.1, 0.261 (eutectic), 0.5, 0.7 and 0.9 mole fraction of lead and between 521 K and 871 K. The experimental data of viscosity of pure components and liquid Pb-Sn alloys were describe d by the exponential equation eta = Aexp(E/RT). The dependence of viscosity on temperature and concentration was modeled by the K u c h a r s k i ' s method considered in the calculations the activity coefficients, the partic la molar volume of components and the molar volume of liquid alloys. Obtain ed isotherms of viscosity at 623 K and 823 K have shown nearly linear chang es with the concentration and a reasonable agreement with the experimental data. The observed differences when compared with data from the literature do not exceed 15%.