电解铝钪合金的热力学

简要介绍了铝—钪合金的优异性能 ,发展现状 ;提出了利用未经高度提纯的氧化钪 ,直接在电解槽中电解铝—钪合金的工艺方案 ;对该方案的反应热力学数据进行了计算 ,并利用Miedema模型对钪在铝中的活度系数进行了计算。结果表明 :在电解条件下 ( 12 2 3K) ,钪与铝共同析出时 ,在铝液中的平衡活度最大可以达到 2 33 %。加之钪与铝生成稳定的高熔点化合物 ,使钪在铝中的活度系数远小于 1,从而使在电解槽中直接生产含钪在 2 %左右的铝钪合金成为可能。

The Thermodynamics of Electrolysis Al Sc Alloys

The excellent performance and the development of Al-Sc alloys are introduced. The preliminary scheme, that using the impure oxides of Scandium to electrolyze to get Al-Sc alloys directly in an electrobath, has been studied. The thermodynamical feasibility of this scheme is analyzed, and the activity coefficient of Sc in Al-Sc alloys is calculated by using Miedema's model. The results show that the equilibrium activity of Sc in Al-Sc alloy can attain to 2.33% when the system is in electrolyze condition (at 1 223K) and Sc & Al separate together. At the same time, the activity coefficient of Sc in Al-Sc alloys much less then 1 due to a stable compound with very high melting temperature was formed. So it will be possible to receive the Al-Sc alloy with 2% Sc in electrobath directly.