High-temperature oxidation and hot corrosion of Cr2AlC

High-temperature oxidation and hot corrosion behaviors of Cr2AlC were investigated at 800-1300 deg C in air. Thermogravimetric-differential scanning calorimetric test revealed that the starting oxidation temperature for Cr2AlC is about 800 deg C, which is 400 deg C higher than other ternary transiti...

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Veröffentlicht in:	Acta materialia 2007-10, Vol.55 (18), p.6182-6191
Hauptverfasser:	LIN, Z. J, LI, M. S, WANG, J. Y, ZHOU, Y. C
Format:	Artikel
Sprache:	eng
Schlagworte:	Applied sciences Corrosion Corrosion environments Exact sciences and technology Metals. Metallurgy
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Zusammenfassung:	High-temperature oxidation and hot corrosion behaviors of Cr2AlC were investigated at 800-1300 deg C in air. Thermogravimetric-differential scanning calorimetric test revealed that the starting oxidation temperature for Cr2AlC is about 800 deg C, which is 400 deg C higher than other ternary transition metal aluminum carbides. Thermogravimetric analyses demonstrated that Cr2AlC displayed excellent high-temperature oxidation resistance with parabolic rate constants of 1.08X10-12 and 2.96X10-9kg2m-4s-1 at 800 and 1300 deg C, respectively. Moreover, Cr2AlC exhibited exceptionally good hot corrosion resistance against molten Na2SO4 salt. The mechanism of the excellent high-temperature corrosion resistance for Cr2AlC can be attributed to the formation of a protective Al2O3-rich scale during both the high-temperature oxidation and hot corrosion processes.
ISSN:	1359-6454 1873-2453
DOI:	10.1016/j.actamat.2007.07.024