| Vapor pressures of lithium over binary and ternary aluminium alloy melts were calculated on the basis of thermodynamic data for liquid binary aluminium and lithium alloys. According to the calculation the vacuum distillation method was found to be an inadequate way of elimination of lithium from aluminium melts. If the amounts of metallic impurities in the aluminium melts are less than 1 wt.%, they, on the contrary to hydrogen, do not change the vapor pressure of lithium significantly. The calculated interaction parameters, ε, which were used to obtain the vapor pressures of lithium over ternary alloys, showed a systematic dependence on the atomic number of respective i elements. It was assumed that this dependence is related to the properties of corresponding binary systems (i.e Al-Li. Li-i, Al-i), which form a ternary aluminium alloy(i.e.Al-Li-i). |
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