Abstract
Closed-pore Al2O3-MgAl2O4 refractory aggregates have been prepared successfully based on the superplasticity of Al2O3 ceramic by using a mixed ball-milling method and the gelcasting method. The effects of SiC content on phase composition, porosity and microstructures of the refractory aggregates have been investigated. The properties of Al2O3-MgAl2O4 refractory aggregates fabricated by different methods have been compared to our results. We discuss the influence mechanism of SiC on the refractory aggregate. The results showed that the main phase compositions were corundum and MgAl2O4 spinel with accompanying small amounts of mullite phase. The closed porosity increased with increased addition of SiC. SiC facilitated the sinterability of materials resulting in a low level of apparent porosity. When compared to the mixed ball-milling method, the closed pore size distribution in the refractory aggregates fabricated by the gelcasting method was more uniform.
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