In this study, Ti 2 AlC/Ti 2 AlN powders were first incorporated to fabricate lowcarbon MgO-C refractories, and their oxidation behaviors were investigated. Computed tomography (CT) results indicated that stress cracks only occurred in the Ti 2 AlC-added sample after exposure to 1100 • C, and the anomalous oxidation behavior of Ti 2 AlC powder at 578 • C worsened the oxidation result at 1100 • C for MgO-C refractories with Ti 2 AlC. At 1500 • C, the oxidation behaviors of MgO-Ti 2 AlC/Ti 2 AlN-C samples revealed a slight mass gain due to the disintegration of Ti 2 AlC/Ti 2 AlN, and their oxidation resistances increased by 18% as compared to their counterparts. In addition, the role of Ti 2 AlC/Ti 2 AlN was elucidated. The oxidation process was comprehensive and was mainly determined by the deterioration of carbon and MAX phases. The obtained results indicated that Ti 2 AlN was more suitable for fabricating low-carbon MgO-C refractories as compared with Ti 2 AlC.

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