The effect of Y_2O_3 addition on the sintering properties and microstructure of spinel was investigated using alumina-rich spinel as the raw material. The phase constitution and microstructure of the specimens were characterized by XRD and SEM,and the pore structure of the specimens was measured by a mercury porosimeter. The results indicate that a viscous melt forms wrapping around spinel crystals by adding a little Y_2O_3 powders(1 mass%),yttrium alumina garnet will crystallize around spinel crystals by adding more Y_2O_3 powders( ≥3 mass%); the sintering properties of the spinel are significantly improved by adding Y_2O_3 powders less than 3 mass%,while they will be relatively weakened by adding Y_2O_3 powders more than 3 mass%.
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