Morphology characterization of periclase–hercynite refractories by reaction sintering

被引：5
|
作者：
Peng Jiang [1 ]
Jun-hong Chen [1 ]
Ming-wei Yan [1 ]
Bin Li [1 ]
Jin-dong Su [1 ]
Xin-mei Hou [2 ]
机构：
[1] School of Materials Science and Engineering, University of Science and Technology Beijing
[2] Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing
来源：
International Journal of Minerals,Metallurgy and Materials | 2015年 / 22卷 / 11期
基金：
中央高校基本科研业务费专项资金资助;
关键词：
refractories; periclase; hercynite; sintering; morphology; diffusion;
D O I：
暂无
中图分类号：
TQ175.1 [基础理论];
学科分类号：
0805 ; 080502 ;
摘要：
A periclase?hercynite brick was prepared via reaction sintering at 1600°C for 6 h in air using magnesia and reaction-sintered hercynite as raw materials. The microstructure development of the periclase?hercynite brick during sintering was investigated using X-ray diffraction, X-ray photoelectron spectroscopy, and scanning electron microscopy in combination with energy-dispersive X-ray spectroscopy. The results show that during sintering, Fe2+, Fe3+ and Al3+ ions in hercynite crystals migrate and react with periclase to form(Mg1-xFex)(Fe2-yAly)O4 spinel with a high Fe/Al ratio. Meanwhile, Mg2+ in periclase crystals migrates into hercynite crystals and occupies the oxygen tetrahedron vacancies. This Mg2+ migration leads to the formation of(Mg1-uFeu)(Fe2-vAlv)O4 spinel with a lower Fe/Al ratio and results in Al3+ remaining in hercynite crystals. Cation diffusion between periclase and hercynite crystals promotes the sintering process and results in the formation of a microporous structure.
引用
收藏
页码：1219 / 1224
页数：6
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