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Morphology characterization of periclase–hercynite refractories by reaction sintering

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Abstract

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-x Fe x )(Fe2-y Al y )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-u Fe u )(Fe2-v Al v )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.

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Authors and Affiliations

  1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, China

    Peng Jiang, Jun-hong Chen, Ming-wei Yan, Bin Li & Jin-dong Su

  2. Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing, 100083, China

    Xin-mei Hou

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  1. Peng Jiang
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  2. Jun-hong Chen
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  3. Ming-wei Yan
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  4. Bin Li
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  5. Jin-dong Su
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Correspondence to Jun-hong Chen or Xin-mei Hou.

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Jiang, P., Chen, Jh., Yan, Mw. et al. Morphology characterization of periclase–hercynite refractories by reaction sintering. Int J Miner Metall Mater 22, 1219–1224 (2015). https://doi.org/10.1007/s12613-015-1188-6

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  • DOI: https://doi.org/10.1007/s12613-015-1188-6

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