A new synthetic route to MgO-MgAl2O4-ZrO2 highly dispersed composite material through formation of Mg5Al2.4Zr1.7O12 metastable phase:synthesis and physical properties

Peng Jiang; Guo-xiang Yin; Ming-wei Yan; Jia-lin Sun; Bin Li; Yong Li

doi:10.1007/s12613-017-1412-7

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Peng Jiang, Guo-xiang Yin, Ming-wei Yan, Jia-lin Sun, Bin Li, and Yong Li, A new synthetic route to MgO-MgAl₂O₄-ZrO₂ highly dispersed composite material through formation of Mg₅Al_2.4Zr_1.7O₁₂ metastable phase:synthesis and physical properties, Int. J. Miner. Metall. Mater., 24(2017), No. 3, pp.332-341. https://dx.doi.org/10.1007/s12613-017-1412-7

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A new synthetic route to MgO-MgAl₂O₄-ZrO₂ highly dispersed composite material through formation of Mg₅Al_2.4Zr_1.7O₁₂ metastable phase:synthesis and physical properties

摘要: Mg₅Al_2.4Zr_1.7O₁₂ metastable phase was successfully synthesized from analytical-grade MgO, α-Al₂O₃, MgAl₂O₄, and ZrO₂ under an N₂ atmosphere. The sintering temperature was varied from 1650 to 1780℃, and the highest amount of Mg₅Al_2.4Zr_1.7O₁₂ appeared in the composite material when the sintering temperature was 1760℃. According to our research of the formation mechanism of Mg₅Al_2.4Zr_1.7O₁₂, the formation and growth of MgAl₂O₄ dominated when the temperature was not higher than 1650℃. When the temperature was higher than 1650℃, MgO and ZrO₂ tended to diffuse into MgAl₂O₄ and the Mg₅Al_2.4Zr_1.7O₁₂ solid solution was formed. When the temperature reached 1760℃, the formation of Mg₅Al_2.4Zr_1.7O₁₂ was completed. The effect of MgAl₂O₄ spinel crystals was also studied, and their introduction into the composite material promoted the formation and growth of Mg₅Al_2.4Zr_1.7O₁₂. A highly dispersed MgO-MgAl₂O₄-ZrO₂ composite material was prepared through the decomposition of the Mg₅Al_2.4Zr_1.7O₁₂ metastable phase. The as-prepared composite material showed improved overall physical properties because of the good dispersion of MgO, MgAl₂O₄, and ZrO₂ phases.

A new synthetic route to MgO-MgAl₂O₄-ZrO₂ highly dispersed composite material through formation of Mg₅Al_2.4Zr_1.7O₁₂ metastable phase:synthesis and physical properties

Abstract: Mg₅Al_2.4Zr_1.7O₁₂ metastable phase was successfully synthesized from analytical-grade MgO, α-Al₂O₃, MgAl₂O₄, and ZrO₂ under an N₂ atmosphere. The sintering temperature was varied from 1650 to 1780℃, and the highest amount of Mg₅Al_2.4Zr_1.7O₁₂ appeared in the composite material when the sintering temperature was 1760℃. According to our research of the formation mechanism of Mg₅Al_2.4Zr_1.7O₁₂, the formation and growth of MgAl₂O₄ dominated when the temperature was not higher than 1650℃. When the temperature was higher than 1650℃, MgO and ZrO₂ tended to diffuse into MgAl₂O₄ and the Mg₅Al_2.4Zr_1.7O₁₂ solid solution was formed. When the temperature reached 1760℃, the formation of Mg₅Al_2.4Zr_1.7O₁₂ was completed. The effect of MgAl₂O₄ spinel crystals was also studied, and their introduction into the composite material promoted the formation and growth of Mg₅Al_2.4Zr_1.7O₁₂. A highly dispersed MgO-MgAl₂O₄-ZrO₂ composite material was prepared through the decomposition of the Mg₅Al_2.4Zr_1.7O₁₂ metastable phase. The as-prepared composite material showed improved overall physical properties because of the good dispersion of MgO, MgAl₂O₄, and ZrO₂ phases.

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