Kinetic Aspects of Ti 2 AlC MAX Phase Oxidation

摘要: The oxidation kinetics of a commercial Ti2AlC MAX phase compound were measured in 100 h isothermal thermogravimetric tests at 1,100, 1,200, and 1,300 °C. A significant amount transient took place during the initial 5 min heating due to rapid growth non-protective TiO2 scales. After correcting for this amount, shown as knee log–log plots, mass gain was similar that alumina-forming FeCrAl alloys. Nearly t1/3 cubic obeyed, reported literature. An activation energy ~340 kJ/mol found, ~380 kJ/mol previously demonstrated grain boundary oxygen diffusivity. Power law fitting accounts coarsening effects on an otherwise fundamentally parabolic scaling process. In summation, steady-state are consistent with diffusion mechanisms alumina