• Shevchenko, Maxim
• Jak, Evgueni
• Abdeyazdan, Hamed
• Ilyushechkin, A.

Abstract

Phase equilibria of the PbO-SnO-SnO-SiO slags with solid phases (cristobalite, tridymite and quartz SiO, cassiterite SnO, massicot PbO, lead stannate PbSnO, and lead-tin silicate PbSnSiO) were studied at 800–1730 °C in air and in equilibrium with Pb-Sn metal. High-temperature equilibration on silica, platinum or platinum–iridium foil, or on MgO substrates, followed by quenching and direct measurement of Pb, Sn and Si concentrations in the phases using electron probe X-ray microanalysis (EPMA) was used to accurately characterize the system. Present experimental data were used to obtain a self-consistent set of parameters of the thermodynamic models for all phases in this system using FactSage computer package. The modified quasichemical model with two sublattices (Pb, Sn, Sn, Si)(O) was used for the liquid slag phase, while all solid phases were described as stoichiometric. A detailed review was done to reevaluate the properties of SnO and SnO slag endmembers and the melting point of cassiterite in air. Present study was a part of research program on the characterization of the multicomponent Pb–Zn–Cu–Fe–Ca–Si–O–S–Al–Mg–Cr–As–Sn–Sb–Bi–Ag–Au–Ni system.

Topics

• phase
• Platinum
• tin
• quenching
• electron probe micro analysis
• Iridium