Abstract: In order to find materials that can effectively resist the erosion of LiF electrolyte in rare earth fluoride molten salt electrolysis system,high-purity La₂O₃ and Al₂O₃ powders with a mass ratio of 1∶1 were first subjected to secondary calcination at 1150 ℃ for 4 hours in an air atmosphere to synthesize high-purity single-phase LaAlO₃ powder;Subsequently,a binder polyvinyl alcohol solution was added to the powder,and a LaAlO₃ crucible sample was prepared by heat treatment at 1600 ℃ for 4 hours;Load LiF powder into LaAlO₃ crucible samples and conduct corrosion resistance tests at 950 ℃ for 2 hours.The corrosion resistance of LaAlO₃ material to molten LiF was studied.The results showed that the erosion depth of the LaAlO₃ crucible sample was only about 30 μ m,the matrix structure was not damaged,and the LaAlO₃ material did not significantly diffuse into the molten LiF; LaAlO₃ and LiF are still the main phases in the interface reaction products between molten LiF and crucible samples.Therefore,LaAlO₃ material exhibits significant corrosion resistance to molten LiF electrolyte and has the potential to be used as a crucible material for rare earth fluoride molten salt electrolysis.

Key words: LaAlO₃, Anti erosion performance, Interface response, LiF electrolyte

摘要： 为寻找能有效抵抗稀土氟化物熔盐电解体系中LiF电解质侵蚀的材料,首先将物质的量比为1∶1的高纯La₂O₃和Al₂O₃粉在空气气氛下于1 150 ℃保温4 h进行二次焙烧,合成了高纯单相LaAlO₃粉体;随后向该粉体中加入黏结剂聚乙烯醇溶液,经1 600 ℃保温4 h热处理制得LaAlO₃坩埚试样;最后将LiF粉体装入LaAlO₃坩埚试样中,在950 ℃下保温2 h进行抗侵蚀试验,研究了LaAlO₃材料对熔融LiF的抗侵蚀性能。结果表明:LaAlO₃坩埚试样的侵蚀深度仅约30 μm,基体结构未被破坏,且LaAlO₃材料也未向熔融LiF内部发生显著扩散;熔融LiF与坩埚试样的界面反应产物中,LaAlO₃和LiF仍是主要物相。因此,LaAlO₃材料对熔融LiF电解质表现出显著的抗侵蚀性能,具备作为稀土氟化物熔盐电解用坩埚材料的应用潜力。

关键词: LaAlO₃, 抗侵蚀性能, 界面反应, LiF电解质