Electrical conductivity optimization of the Na3AlF6-Al2O3-Sm2O3 molten salts system for Al-Sm intermediate binary alloy production
Electrical conductivity optimization of the Na3AlF6-Al2O3-Sm2O3 molten salts system for Al-Sm intermediate binary alloy production
复制标题
用于 Al-Sm 中间二元合金生产的 Na3AlF6-Al2O3-Sm2O3 熔盐体系的电导率优化
DOI：
10.1007/s12613-017-1493-3
复制
发表时间：
2017
影响因子：
4.8
通讯作者：
Tang Hao
中科院分区：
文献类型：
--
作者：
Liao Chun fa;Jiao Yun fen;Wang Xu;Cai Bo qing;Sun Qiang chao;Tang Hao
金属Sm在制备Al-Sm永磁合金材料中有着广泛的应用。传统的蒸馏法生产钐工艺存在生产效率低、成本高、污染严重等缺点。本研究的目的是开发一种熔盐电解液体系，直接生产铝钐合金，重点是导电性和最佳的操作条件，以减少能源消耗。采用连续变槽常数（CVCC）技术，在905 ~ 1055°C温度范围内测定了Na 3AlF 6-AlF 3-LiF-MgF 2-Al 2 O3-Sm 2 O3电解介质的电导率。研究了温度（t）、Al 2 O3（W（Al 2 O3））、Sm 2 O3（W（Sm 2 O3））以及Al 2 O3和Sm 2 O3的混合物对氟化物体系电导率（κ）和活化能的影响。实验结果表明，电解液的电导率随温度的升高而增大，随Al 2 O3或Sm 2 O3的加入而减小，随两者的同时加入而减小。结果表明，在Na 3AlF 6-AlF 3-LiF-MgF 2-Al 2 O3-Sm 2 O3体系中制备Al-Sm中间合金的最佳操作条件为：W（Al 2 O3）+W（Sm 2 O3）= 3wt%，W（Al 2 O3）：W（Sm 2 O3）= 7：3，温度为965 ~ 995°C，该体系具有良好的导电性，氟化物蒸发损失小，能耗低。
Metal Sm has been widely used in making Al–Sm magnet alloy materials. Conventional distillation technology to produce Sm has the disadvantages of low productivity, high costs, and pollution generation. The objective of this study was to develop a molten salt electrolyte system to produce Al–Sm alloy directly, with focus on the electrical conductivity and optimal operating conditions to minimize the energy consumption. The continuously varying cell constant (CVCC) technique was used to measure the conductivity for the Na3AlF6–AlF3–LiF–MgF2–Al2O3–Sm2O3electrolysis medium in the temperature range from 905 to 1055°C. The temperature (t) and the addition of Al2O3(W(Al2O3)), Sm2O3(W(Sm2O3)), and a combination of Al2O3and Sm2O3into the basic fluoride system were examined with respect to their effects on the conductivity (κ) and activation energy. The experimental results showed that the molten electrolyte conductivity increases with increasing temperature (t) and decreases with the addition of Al2O3or Sm2O3or both. We concluded that the optimal operation conditions for Al–Sm intermediate alloy production in the Na3AlF6–AlF3–LiF–MgF2–Al2O3–Sm2O3system areW(Al2O3) +W(Sm2O3) = 3wt%,W(Al2O3):W(Sm2O3) = 7:3, and a temperature of 965 to 995°C, which results in satisfactory conductivity, low fluoride evaporation losses, and low energy consumption.