作者：Peng Jiang1Guo-xiang Yin1Ming-wei Yan1Jia-lin Sun1Bin Li2Yong Li1

作者单位：1. School of Materials Science and Engineering,University of Science and Technology Beijing2. Collaborative Innovation Center of Steel Technology,University of Science and Technology Beijing

刊名：International Journal of Minerals Metallurgy and Materials

ISSN：1674-4799

出版年：2017-03-15

卷：24

期：3

起页：332-341

止页：

分类号：TQ175.1;TB33

语种：英文

关键词：

内容简介

Mg5Al2.4Zr1.7O12 metastable phase was successfully synthesized from analytical-grade Mg O,α-Al2O3,MgAl2O4,and ZrO2 under an N2 atmosphere.The sintering temperature was varied from 1650 to 1780°C,and the highest amount of Mg5Al2.4Zr1.7O12 appeared in the composite material when the sintering temperature was 1760°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 1650°C.When the temperature was higher than 1650°C,MgO and ZrO2 tended to diffuse into MgAl2O4 and the Mg5Al2.4Zr1.7O12 solid solution was formed.When the temperature reached 1760°C,the formation of Mg5Al2.4Zr1.7O12 was completed.The effect of Mg Al2O4 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–Mg Al2O4–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.