两步烧结法制备镁铝尖晶石及其在Na3AlF6-AlF3-CaF2-Al2O3电解质中的腐蚀

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Bibliographic Details
Published in中国有色金属学报：英文版 Vol. 26; no. 10; pp. 2754 - 2761
Main Author 刘建华 吕晓军 李劼 胡凌云 蒋良兴
Format Journal Article
LanguageEnglish
Published 2016
Subjects
烧结
耐腐蚀性能
铝电解
镁铝尖晶石
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Bibliography:magnesium aluminate spinel;sintering;aluminum electrolysis;corrosion resistance
43-1239/TG
Jian-hua LIU, Xiao-jun Lü, Jie LI, Ling-yun HU, Liang-xing JIANG（ School of Metallurgy and Environment, Central South University, Changsha 410083, China）
New types of refractory materials need to be developed for designing the man-made ledge of the Hall-Heroult cell for aluminum electrolysis, which are currently constructed by frozen ledge.Magnesium aluminate spinel （MAS） as potential candidate materials was prepared by two-step sintering. The densification and grain growth of the MAS wereinvestigatedbytheArchimedes drainage method and scanning electron microscope （SEM）. All the specimens were corroded in aNa3AlF6-AlF3-CaF2-Al2O3bath to assess the corrosion resistance. The results show that a MAS material with a high relative density of 99.2% and ahomogeneous microstructure is achieved under two-step sintering conditions. The corrosion mechanisms of MAS inNa3AlF6-AlF3-CaF2-Al2O3 bathare mainly proposed by dissolution of MAS, formation of aluminum oxide, and diffusion of fluorides. The MAS prepared by two-step sintering exhibits good corrosion resistance to theNa3AlF6-AlF3-CaF2-Al2O3bath.
ISSN:1003-6326