Enhanced service performances of in-situ Mg-Sialon/MgAl2O4 folding structure in low carbon Al2O3–C refractories: Phase reconfiguration of nano-MgSiN2.

The utilization of in-situ ceramic combination effectively addressed the issue of weak bonding at the interface in low carbon Al 2 O 3 –C refractories, enhancing the material service performances. In this study, nano-MgSiN 2 synthesized from molten salt was utilized for incorporation of Al 2 O 3 –C refractories, as well as in assessment of mechanical properties, thermal shock stability, oxidation resistance and corrosion resistance. The findings demonstrate that the molten salt medium can lower synthesis temperature and decrease particle size of nano-MgSiN 2. In addition, nano-MgSiN 2 undergone phase reconfiguration at 1500 °C to form Mg (g) and Si 3 N 4(s). The folding structure Mg-Sialon/MgAl 2 O 4 were formed through phase reconfiguration of Mg (g) and Si 3 N 4(s). This change enhanced interfacial bonding strength of Mg-Sialon/Al 2 O 3 and MgAl 2 O 4 /Al 2 O 3. The mechanical properties and thermal shock stability of refractories were enhanced by novel reconfiguration technology, resulting in CCS value of 176.9 MPa. Simultaneously, Mg-Sialon transformation facilitated the interconnection of the oxide layer, enhancing oxidation resistance and corrosion resistance. [ABSTRACT FROM AUTHOR]