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Phase Relationship at Subsolidus Temperature of MgO-MgAl_2O_4-ZrO_2 Subsystem
Three groups of cylinder specimens(φ10 mm×10 mm) with 20%, 30% and 40%(by mass, the same hereinafter) of ZrO_2, were prepared using analytically pure MgO, Al_2O_3 and ZrO_2 powders as the starting materials. The specimens were fired at 1 600 ℃ for 5 h, 1 700 ℃ for 0 h and 1 800 ℃ for 7 h, respectively. The microstructure of the MgO-MgO-MgAl_2O_4-ZrO_2 subsystem was studied by FESEM. The results show that(1) in the temperature range of 1 600-1 700 ℃, solid phase reactions happen in the MgO-MgO-MgAl_2O_4-ZrO_2 subsystem, leaving three phases: periclase, spinel and ZrO_2(solid dissolving with Mg2+) co-existing; spinellization affects the densification;(2) the specimen with 40% ZrO_2 fired at 1 800 ℃ has heterogeneous melting microstructure; some areas form typical ternary eutectic MgO-MgO-MgAl_2O_4-ZrO_2 with composition of MgO 35.2%-37.2%, Al_2O_ 24.2%-26.6%, and ZrO_2 37.2%-39.8%.
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2020年01期
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