High-strength microporous corundum-mullite refractory aggregates with sub-micron pores using vacuum impregnation treatment

Chen, Zhe; Yan, Weiping; Schafföner, Stefan; Zhi, Jinna; Li, Nan

doi:10.1016/j.jmrt.2022.06.091

Cited by 9 publications

(2 citation statements)

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“…The pore-structural parameters and microstructures of porous corundum aggregates considerably affect the bulk density, thermal conductivity, and slag resistance of Al 2 O 3 -MgO refractory castables. [17][18][19] The preparation methods of porous corundum-based aggregates, including high-temperature foaming, 20 in situ decomposition, 12,19,21 and pore-forming agent addition, 7,18,22 have been extensively studied. Yuan et al 20 fabricated porous Al 2 O 3 -based aggregates with a closed porosity of ∼16% using submicron-sized Al 2 O 3 and MgO powders as raw materials and SiC as a hightemperature foaming agent.…”

Section: Introductionmentioning

confidence: 99%

“…Currently, lightweight Al 2 O 3 –MgO refractory castables are primarily fabricated by substituting porous aggregates with tabular corundum aggregates. The pore‐structural parameters and microstructures of porous corundum aggregates considerably affect the bulk density, thermal conductivity, and slag resistance of Al 2 O 3 –MgO refractory castables 17–19 . The preparation methods of porous corundum‐based aggregates, including high‐temperature foaming, 20 in situ decomposition, 12,19,21 and pore‐forming agent addition, 7,18,22 have been extensively studied.…”

Section: Introductionmentioning

confidence: 99%

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Properties and microstructures of porous corundum‐spinel aggregates fabricated via the Kirkendall effect

He,

Mi,

Chen

et al. 2024

Int J Applied Ceramic Tech

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Four porous corundum‐spinel aggregates were prepared from magnesia and α‐Al2O3 micropowder via the Kirkendall effect. Effects of the particle size of magnesia (PSM, 0–74 μm, 0–15 μm, and 0–44 μm) and firing temperature (1100–1600°C) on the phase compositions, microstructures, pore characteristics of the prepared porous aggregates were investigated. As the firing temperature increased, the PSM influenced the reaction rate of magnesia and alumina, and the sintering process, leading to remarkable changes in the phase compositions, porosity, and microstructure with a negligible impact on the pore size distribution. As the PSM decreased from 0–74 μm to 0–15 μm, the apparent porosity initially increased and then decreased. Relatively compact cyclic spinels formed around the Kirkendall pores in aggregates with 0–74 μm and 0–44 μm magnesia added after fired at 1600°C, as the expansion of spinel formation was inhibited by the high strength of the alumina matrix. Finally, the optimized product is an aggregate with 0–44 μm magnesia added, which exhibits a high total porosity of 32.4%, a low bulk density of 2.69 g/cm3, and a thermal conductivity of 2.178 W/(m·K) at 1000°C, as well as a high compressive strength of 302.5 MPa and a small median pore size of .46 μm. This work provides a promising technique for preparing porous‐corundum‐based aggregates.

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