Abstract
Phase relationships of the Cu-O-ZnO-CaO system in equilibrium with air (p tot = 1 atm, \( p_{{{\text{O}}_{2} }} = 0.21\,{\text{atm}} \)) have been studied using the equilibration and quenching technique within the temperature range from 1273 K to 1773 K (1000 °C to 1500 °C). The chemical compositions of the molten oxide and solid phases in equilibrium were analyzed by EPMA. The eutectic point in the Cu-O-ZnO-CaO system was found to be 1293 K ± 2 K (1020 °C ± 2 °C) and 0.6785 mole fraction tenorite (‘CuO’), 0.1793 mole fraction halite (CaO), and 0.1422 mole fraction wurtzite (ZnO). The results from the present study have been used in constructing the liquidus surface of the Cu-O-ZnO-CaO system. The liquidus surface expands dramatically along with increasing temperature, and it moves simultaneously toward the primary phase fields of wurtzite (ZnO) and halite (CaO). The constructed liquidus surfaces have been compared with the isothermal sections (‘Cu2O’-ZnO-CaO) calculated by MTDATA 5.10 software and its Mtox 8.1 database. Deviations between the thermodynamically assessed diagrams and the experimental results are significant. Thus, the system requires a reassessment.
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Acknowledgments
The research was financially supported by Association of Finnish Steel and Metal Producers, and Systems Integrated Metal Processes (SIMP) program by FIMECC and Tekes. One of the authors acknowledges the support from CIMO Fellowship Programme TM-15-9810.
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Manuscript submitted March 7, 2016.
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Xia, L., Liu, Z. & Taskinen, P. Experimental Determination of the Liquidus Surface of the Cu-O-ZnO-CaO System in Equilibrium with Air. Metall Mater Trans B 47, 3413–3420 (2016). https://doi.org/10.1007/s11663-016-0800-0
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DOI: https://doi.org/10.1007/s11663-016-0800-0