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• W4313397332 endingPage "111787" @default.
• W4313397332 startingPage "111787" @default.
• W4313397332 abstract "Vacuum refining is a green technology for separating Ca from Si–Ti alloys. This study investigated the kinetics of Ca evaporation from Si–Ti melts in vacuum refining, including the effect of holding time and melt temperature and composition. Although the Ca activity in Si–Ti melts is an essential thermodynamic property that affects the Ca evaporation kinetics, it has not been measured to date. Consequently, another objective of this study was to determine the Ca activity using a chemical equilibration technique and investigate its effect on Ca evaporation. The results show that the activity of Ca in the Si–Ti melt decreased gradually with increasing Ti content in the melt, which reduced the Ca removal ratio. The removal ratio of Ca increased with the temperature and holding time. The apparent evaporation rate of Ca was consistent with the first-order law, and the apparent evaporation rate constants of Ca in 15%Si–Ti melt at 1673 and 1773 K were 2.1 × 10−6 and 2.8 × 10−6 m/s, respectively. The apparent activation energy for Ca evaporation from Si–15 wt%Ti melt was determined to be 68.2 kJ/mol, and the rate-determining step to be Ca mass transfer at the melt boundary layer." @default.
• W4313397332 created "2023-01-06" @default.
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• W4313397332 date "2023-03-01" @default.
• W4313397332 modified "2023-09-27" @default.
• W4313397332 title "Purification of Si–Ti alloys via vacuum evaporation: A thermodynamic and kinetic study of Ca impurity removal" @default.
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• W4313397332 doi "https://doi.org/10.1016/j.vacuum.2022.111787" @default.
• W4313397332 hasPublicationYear "2023" @default.
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