Study of Y-Ni Alloy Preparation by Molten Salt Electrolysis
The Y-Ni alloy was prepared by self-consuming cathode molten salt electrolysis using Y2O3 as raw material and YF3-LiF as molten salt,and the effects of electrolysis voltage and current on alloy composition,electrolysis temperature,elec-trolysis efficiency and metal yield were studied.Under the molten salt system of 61.5％YF3-38.5％LiF(Atomic fraction),the electrolysis voltage and current had significant effects on the electrolysis temperature.The electrolysis temperature was too high,the dissolution of rare-earth metals in the melt was accelerated,the oxidation of rare-earth metals and secondary reac-tions were intensified,and the Y composition content,electrolysis efficiency and Y metal yield of the alloy gradually decreased with the increase of electrolysis temperature.The optimum electrolysis conditions were obtained as follows:electrolysis voltage is 7.2 V±0.2 V,electrolysis current is 555 A±5 A,and electrolysis temperature is 1080 ℃±20 ℃.Through the character-ization analysis of the Y-Ni alloy,the prepared Y-Ni alloy had a relatively uniform composition without obvious segregation.The alloy had Y∶Ni=1∶1(Mass fraction)and was mainly composed of YNi phase and YNi2 phase,in which the percentage of YNi phase was 42.11％and the percentage of YNi2 phase was 57.89％.
molten salt electrolysisyttrium-nickel alloyYF3-LiFself-consuming cathode
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