Preparation of LaNi5 by FFC Cambridge Process

Yun Gao; Hui Xiao Zhao; Zheng Zhou; Lei Mao; Man Hua Peng

doi:10.4028/www.scientific.net/AMR.189-193.575

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 189-193Preparation of LaNi5 by FFC Cambridge Process

Preparation of LaNi₅ by FFC Cambridge Process

Abstract:

A new technique was proposed for preparation of LaNi5 powder by direct electrolytic deoxidation of solid La₂O₃–NiO mixture oxides in molten CaCl₂–NaCl. Oxides pellets was sintered and used as cathode. High – density graphite was used as anode. Electrolysis was performed. Current change during electrolysis was recorded. XRD was used to analyse the composition of products. SEM was used to analysis surface and cross section of pellets before sintering, after sintering and after electrolysis. The preparation mechanism and the influences of sintering temperature and cell voltage on electrolytic deoxidation was studied. Results show that the optimum conditions to prepare LaNi₅ are：NiO-La₂O₃（Ni:La=5:1）pellets are formed at 30MPa, sintered at 850°C for 5h, electrolyzed under 3.2V in CaCl₂–NaCl melt at 850°C for more than 12 hours.