Preparation of Yttrium-Barium-Copper Trinary Master Alloys by Electrolysis from Molten Fluoride-oxide

摘要

The electrochemical behaviour of Y~(3+) and Ba~(2+) on platinum and copper electrode in molten YF_3 (70 wt%)-NaF (20 wt%)-CaF_2(10 wt%) has been studied by means of cyclic voltammetry, discharge curve and so on. The Y-Ba-Cu alloy is obtained by fused salt electrolysis with molten YF_3-NaF-CaF_2 as electrolyte and Y_2O_3 and BaO as raw materials. Graphite cell acted as an anode and copper rod as consumable cathode. The molten bath temperature was 1193 K. Cathode current density was 20 A/cm_2. The contents of yttrium, barium and copper in alloy were about 20 wt%, 9 wt% and 71 wt% respectively. Yttrium recovery efficiency was 90 wt%. The current efficiency was 70%～80%.