Abstract
Catastrophic breakaway oxidation of Ti3AlC2 occurs during long-term oxidation at 1100°C in air up to 4000h. Correspondingly, the oxidation kinetics transforms from cubic law to linear law. The transition time is about 3171h, and the corresponding critical Al content is about 5.99% lower than the initial content. Afterwards, Ti and C start to be oxidized instead of selective oxidation of Al, and Al2O3 scale loses its protectiveness. Meanwhile, voids generated at the Al2O3/Ti3AlC2 interface reduce the oxide scale adhesion. After 3250h oxidation, Ti3AlC2 still maintains its crystal structure, indicating the capability of bearing great Al lack.
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