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

作者：Jiang, Peng; Yin, Guo-xiang; Yan, Ming-wei; Sun, Jia-lin; Li, Bin; Li, Yong^*

来源：International Journal of Minerals,Metallurgy and Materials, 2017, 24(3): 332-341.

DOI：10.1007/s12613-017-1412-7

• metastable phases
• formation mechanisms
• composite materials
• refractory materials
• synthesis
• physical properties

Mg5Al2.4Zr1.7O12 metastable phase was successfully synthesized from analytical-grade MgO, alpha-Al2O3, MgAl2O4, and ZrO2 under an N-2 atmosphere. The sintering temperature was varied from 1650 to 1780A degrees C, and the highest amount of Mg5Al2.4Zr1.7O12 appeared in the composite material when the sintering temperature was 1760A degrees C. According to our research of the formation mechanism of Mg5Al2.4Zr1.7O12, the formation and growth of MgAl2O4 dominated when the temperature was not higher than 1650A degrees C. When the temperature was higher than 1650A degrees C, MgO and ZrO2 tended to diffuse into MgAl2O4 and the Mg5Al2.4Zr1.7O12 solid solution was formed. When the temperature reached 1760A degrees C, the formation of Mg5Al2.4Zr1.7O12 was completed. The effect of MgAl2O4 spinel crystals was also studied, and their introduction into the composite material promoted the formation and growth of Mg5Al2.4Zr1.7O12. A highly dispersed MgO-MgAl2O4-ZrO2 composite material was prepared through the decomposition of the Mg5Al2.4Zr1.7O12 metastable phase. The as-prepared composite material showed improved overall physical properties because of the good dispersion of MgO, MgAl2O4, and ZrO2 phases.

• 出版日期2017-3
• 单位北京科技大学