Abstract
It is of great significance to develop new types of refractories by replacing the traditional refractory aggregate with a porous refractory aggregate, which enables long-lived operation of high-temperature industries and low carbon emissions. In this study, microporous MgAl2O4 aggregates containing sub-micron pores were successfully prepared from magnesite and boehmite using an in-situ decomposition pore-forming method. The effects of sintering temperature on the phase compositions, sintering properties, and microstructure of aggregates were reported for the first time. The resulting aggregates sintered at 1500 °C showed superior comprehensive performance with a median equivalent pore diameter of 10.75 μm, corresponding to a bulk density and closed porosity of 2.27 g cm−3 and 8.7%, respectively. Meanwhile, several sub-micron pores were observed in microporous MgAl2O4 aggregates, which contributed to a lower thermal conductivity of 1.932 W m−1 k−1 at 500 °C and a higher compressive strength of 40.8 MPa. In addition, the formation mechanism of sub-micron pores was proposed, and the effects of pore structure on the thermal conductivity and compressive strength were discussed.
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