Morphology characterization of periclase–hercynite refractories by reaction sintering  

作　　者：Peng Jiang Jun-hong Chen Ming-wei Yan Bin Li Jin-dong Su Xin-mei Hou 

机构地区：[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

出　　处：《International Journal of Minerals,Metallurgy and Materials》2015年第11期1219-1224,共6页矿物冶金与材料学报（英文版）

基　　金：the National Nature Science Foundation of China (No. 51172021);the National Science-Technology Support Plan Projects of China (No. 2013BAF09B01);the Fundamental Research Funds for the Central Universities (No. FRF-SD-13-006A)

摘　　要：A periclase？hercynite brick was prepared via reaction sintering at 1600℃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, Fe^2＋, Fe^3＋ and Al^3＋ ions in hercynite crystals migrate and react with periclase to form（Mg1-xFex）（Fe2-yAly）O4 spinel with a high Fe/Al ratio. Meanwhile, Mg^2＋ in periclase crystals migrates into hercynite crystals and occupies the oxygen tetrahedron vacancies. This Mg^2＋ 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.A periclase？hercynite brick was prepared via reaction sintering at 1600℃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, Fe^2＋, Fe^3＋ and Al^3＋ ions in hercynite crystals migrate and react with periclase to form（Mg1-xFex）（Fe2-yAly）O4 spinel with a high Fe/Al ratio. Meanwhile, Mg^2＋ in periclase crystals migrates into hercynite crystals and occupies the oxygen tetrahedron vacancies. This Mg^2＋ 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.

关 键 词：refractories periclase hercynite sintering morphology diffusion 

分 类 号：TQ175.1[化学工程—硅酸盐工业]