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Abstract
Low thermal conductivity and high mechanical strength and slag resistance are usually mutually exclusive properties. In this study, by introducing a superplastic nanoalumina sol, we fabricated microporous alumina by wet milling and investigated its properties. The microporous alumina exhibited a low bulk density and apparent porosity as well as high closed porosity and small median pore diameter. The thermal conductivity of the microporous alumina at 800°C was 6.5Wm−1K−1, which is 41.6% lower than that of tabular alumina. Furthermore, a more continuous, and thicker (100–200μm) Ca(Al,Fe)12O19 (CAF6) and Ca(Al,Fe)4O7 (CAF2) layer was observed at the microporous alumina/slag interface in comparison to the 30–50µm-thick layer usually observed at the tabular alumina/slag interface. The dense continuous isolation layer formed in situ effectively prevented further slag corrosion and penetration. Hence, the microporous alumina exhibited better slag resistance than tabular alumina.
Published Version
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