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Mg_5Al_(2.4)Zr_(1.7)O_(12) metastable phase was successfully synthesized from analytical-grade Mg O,α-Al_2O_3,MgAl_2O_4,and ZrO_2 under an N_2 atmosphere.The sintering temperature was varied from 1650 to 1780°C,and the highest amount of Mg_5Al_(2.4)Zr_(1.7)O_(12) appeared in the composite material when the sintering temperature was 1760°C.According to our research of the formation mechanism of Mg_5Al_(2.4)Zr_(1.7)O_(12),the formation and growth of MgAl_2O_4 dominated when the temperature was not higher than 1650°C.When the temperature was higher than 1650°C,MgO and ZrO_2 tended to diffuse into MgAl_2O_4 and the Mg_5Al_(2.4)Zr_(1.7)O_(12) solid solution was formed.When the temperature reached 1760°C,the formation of Mg_5Al_(2.4)Zr_(1.7)O_(12) was completed.The effect of Mg Al_2O_4 spinel crystals was also studied,and their introduction into the composite material promoted the formation and growth of Mg_5Al_(2.4)Zr_(1.7)O_(12).A highly dispersed MgO–Mg Al_2O_4–ZrO_2 composite material was prepared through the decomposition of the Mg_5Al_(2.4)Zr_(1.7)O_(12) metastable phase.The as-prepared composite material showed improved overall physical properties because of the good dispersion of MgO,MgAl_2O_4,and ZrO_2 phases.
Mg_5Al_ (2.4) Zr_ (1.7) O_ (12) metastable phase was successfully synthesized from analytical-grade MgO, α-Al_2O_3, MgAl_2O_4, and ZrO_2 under an N_2 atmosphere.The atmosphere temperature was varied from 1650 to 1780 ° C, and the highest amount of Mg_5Al_ (2.4) Zr_ (1.7) O_ (12) was found in the composite material when the sintering temperature was 1760 ° C.According to our research of the formation mechanism of Mg_5Al_ (2.4) Zr_ (1.7) O_ ), the formation and growth of MgAl_2O_4 dominated when the temperature was not higher than 1650 ° C.When the temperature was higher than 1650 ° C, MgO and ZrO_2 tended to diffuse into MgAl_2O_4 and the Mg_5Al_ (2.4) Zr_ (1.7) O_ ( 12) solid solution was formed. Temperature reached 1760 ° C, the formation of Mg_5Al_ (2.4) Zr_ (1.7) O_ (12) was completed. The effect of Mg Al_2O_4 spinel crystals was also studied, and their introduction into the composite A highly dispersed MgO-Mg Al_2O_4-ZrO_2 composite m The as-prepared composite material showed improved overall physical properties because of the good dispersion of MgO, MgAl 2 O 4, and ZrO 2 phases.