Two-step sintering of magnesium aluminate spinels and their corrosion in Na3AlF6-AlF3-CaF2-Al2O3 bath

被引：7

作者：

Liu, Jian-hua ^{[1
]}

Lu, Xiao-jun ^{[1
]}

Li, Jie ^{[1
]}

Hu, Ling-yun ^{[1
]}

Jiang, Liang-xing ^{[1
]}

机构：

[1] Cent S Univ, Sch Met & Environm, Changsha 410083, Hunan, Peoples R China

来源：

TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA | 2016年 / 26卷 / 10期

基金：

中国国家自然科学基金;

关键词：

magnesium aluminate spinel; sintering; aluminum electrolysis; corrosion resistance; GRAIN-SIZE; DENSIFICATION; CERAMICS;

D O I：

10.1016/S1003-6326(16)64405-9

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

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 were investigated by the Archimedes drainage method and scanning electron microscope (SEM). All the specimens were corroded in a Na3AlF6-AlF3-CaF2-Al2O3 bath to assess the corrosion resistance. The results show that a MAS material with a high relative density of 99.2% and a homogeneous microstructure is achieved under two-step sintering conditions. The corrosion mechanisms of MAS in Na3AlF6-AlF3-CaF2-Al2O3 bath are 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 the Na3AlF6-AlF3-CaF2-Al2O3 bath.

引用

页码：2754 / 2761

页数：8

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