Oxidation behaviors of low carbon MgO‐C refractories: Roles of Ti₂AlC and Ti₂AlN

Abstract

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.

The effect of different annealing temperatures on the mechanical and tribological properties of the Ti2AlN MAX phase films

“…19 For the R1 films subjected to heat treatment at various temperatures, Ti 2 AlN crystal structures were detected at 13° (002), 34.6° (100), and 40° (103). 20–23 Additionally, TiN phases were observed at 36.8° (111) and 42.7° (200), accompanied by a TiO 2 phase at 41.8° (111). Following annealing at 800°C, the presence of TiO 2 became more pronounced.…”