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

共 24 条

[1] Sintering dense nanocrystalline ceramics without final-stage grain growth [J].

Chen, IW ;

Wang, XH .

NATURE, 2000, 404 (6774) :168-171

[2] A review on magnesium aluminate (MgAl2O4) spinel: synthesis, processing and applications [J].

Ganesh, I. .

INTERNATIONAL MATERIALS REVIEWS, 2013, 58 (02) :63-112

[3] Studies on densification, mechanical, micro-structural and structure-properties relationship of magnesium aluminate spinel refractory aggregates prepared from Indian magnesite [J].

Ghosh, Chandrima ;

Ghosh, Arup ;

Haldar, Manas Kamal .

MATERIALS CHARACTERIZATION, 2015, 99 :84-91

[4] Densification and grain growth of Al2O3 nanoceramics during pressureless sintering [J].

Li, JG ;

Ye, YP .

JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 2006, 89 (01) :139-143

[5] Effect of Sc2O3 addition on densification and microstructure of different spinelized magnesium aluminate spinels [J].

Li, Jie ;

Liu, Jian-hua ;

Lu, Xiao-jun ;

Lai, Yan-qing .

TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA, 2016, 26 (01) :144-151

[6]

LU X J, 2014, LIGHT METALS TMS AIM, P615

[7]

LU Xiao-jun, 2013, China Patent, Patent No. [103060848A, 103060848]

[8] PROCESSING NANOCRYSTALLINE CERAMICS FOR APPLICATIONS IN SUPERPLASTICITY [J].

MAYO, MJ ;

HAGUE, DC ;

CHEN, DJ .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 1993, 166 (1-2) :145-159

[9] Nanostructured, Infrared-Transparent Magnesium-Aluminate Spinel with Superior Mechanical Properties [J].

Mroz, Thomas ;

Goldman, Lee M. ;

Gledhill, Andrew D. ;

Li, Dongsheng ;

Padture, Nitin P. .

INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY, 2012, 9 (01) :83-90

[10] Corrosion of nickel ferrite refractory by Na3AlF6-AlF3-CaF2-Al2O3 bath [J].

Nightingale, Sharon A. ;

Longbottom, Raymond J. ;

Monaghan, Brian J. .

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, 2013, 33 (13-14) :2761-2765

← 1 2 3 →