Reaction Mechanism of Iron-Rich Magnesia-Corundum Composites at 1420°C

Abstract:

Specimens were prepared by using iron-rich magnesia and high-pure magnesia as the main starting materials, and introducing fused corundum of 3%(in mass), 6%, 9%, 12%, 15% respectively and sintered at 1420°C.The samples were characterized by XRD and SEM. The results show that in-situ synthesized composite spinel solid solution were formed in the reaction between iron-rich magnesia and fused corundum. Iron oxides play a key role on the formation of spinel solid solution. When fused corundum was added in a certain particle size, the material showed core-shell structure. Outer layer of core-shell structure were spinel solid solution and the inside were corundum. These core-shell structure make the synthesis of spinel solid solution bonded periclase material at low temperature happen.

• Periodical: Key Engineering Materials (Volume 680)
• Pages: 339-342
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.680.339
• Online since: February 2016
• Authors: Hao Bo Zhang, Yong Li*, Jia Lin Sun, Shuo Cao, Yong Qiang Sun, Yan Jing Li, Chang He Gao, Ji Li Zhang
• Keywords: Fused Corundum, Iron Oxides, Iron-Rich Magnesia, Spinel Solid Solution

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