Термодинамический анализ процессов взаимодействия в системе Cu–Zr–O, реализующихся в условиях существования медного расплава

Thermodynamic modeling of interaction processes of zirconium and oxygen dissolved in liquid copper melt was done. It was found that the components of Cu2O–ZrO2 system are conjugated with liquid metal melt in Cu–Zr–O system. The coordinates of a liquidus line of the Cu2O–ZrO2 diagram were determined using the melting temperature data and the heat of fusion data about Cu2O and ZrO2 oxides as well as the theory of perfect ionic solutions and subregular ionic solutions. The calculations of activities of Cu2O and ZrO2 in the oxide melt showed that a (Cu2O) and a (ZrO2 ) have negative deviation from Raoult’s law in the range of oxide melts existence. The surface of component solubility in metals melts (SCSM) of Cu–Zr–O system was constructed for the temperature range from 1100 to1300 °С. The temperature dependence of the interaction parameter e OZr of liquid copper was determined during SCSM thermodynamic modeling. The compositions of metals melt in equilibrium with pure solid Cu2O and ZrO2 oxides and in equilibrium with oxides melt were determined. The lines of three-phase equilibria (“liquid metal – oxide melt – pure solid Cu2O oxide”; “liquid metal – oxide melt – pure solid ZrO2 oxide”; “liquid metal – pure solid Cu2O oxide – pure solid ZrO2 oxide”) were calculated. The point of the four-phase equilibrium “liquid metal – oxide melt – pure solid Cu2O oxide – pure solid ZrO2 oxide” was set. The isotherms of oxygen solubility in liquid copper were plotted in the SCSM. The maximum of the deoxidizing ability of zirconium in liquid copper was defined. High deoxidizing ability of zirconium in liquid copper melt was defined.