Abstract
High-temperature oxidation and hot corrosion behaviors of Cr 2AlC were investigated at 800–1300 °C in air. Thermogravimetric–differential scanning calorimetric test revealed that the starting oxidation temperature for Cr 2AlC is about 800 °C, which is 400 °C higher than other ternary transition metal aluminum carbides. Thermogravimetric analyses demonstrated that Cr 2AlC displayed excellent high-temperature oxidation resistance with parabolic rate constants of 1.08 × 10 −12 and 2.96 × 10 −9 kg 2 m −4 s −1 at 800 and 1300 °C, respectively. Moreover, Cr 2AlC exhibited exceptionally good hot corrosion resistance against molten Na 2SO 4 salt. The mechanism of the excellent high-temperature corrosion resistance for Cr 2AlC can be attributed to the formation of a protective Al 2O 3-rich scale during both the high-temperature oxidation and hot corrosion processes.
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