Effect of Al4SiC4 addition on oxidation and slag resistance of MgO-C refractories

XS Liu and CY Guo and XK Tian and EH Wang and XM Hou and XH Liu, CERAMICS INTERNATIONAL, 51, 58585-58592 (2025).

DOI: 10.1016/j.ceramint.2025.10.074

Al4SiC4 is distinguished by its exceptional oxidation and slag resistance. Its incorporation into magnesia-carbon (MgO-C) refractories presents a promising strategy for mitigating performance degradation caused by oxidation and corrosion in refractory applications. In this work, the effects of Al4SiC4 on the mechanical properties, oxidation resistance, and slag resistance of MgO-C refractories are systematically studied and compared with those of the widely used Si additive. The results demonstrate that, although MgO-C refractories with Al4SiC4 addition exhibited lower mechanical properties than those with Si addition, they showed significantly enhanced oxidation and slag resistance of MgO-C refractories. Above 1300 degrees C, Al4SiC4 facilitates the reduction of CO(g), effectively mitigating carbon loss and substantially enhancing the oxidation resistance of MgO-C refractories. Compared with MgO-C refractories of Si addition, the slag corrosion depth of MgO-C refractories with Al4SiC4 addition is reduced from over 5.0 mm to less than 2.5 mm. Furthermore, the wetting angle between slag and Al4SiC4 as well as slag and SiC are 144.2 degrees and 120.3 degrees by molecular dynamics simulations at 1600 degrees C, indicating that Al4SiC4 effectively reduces slag wettability, thereby improving the slag corrosion resistance of MgO-C refractories.

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