The cyclic oxidation behavior of a magnetron sputtered NiAl microcrystallin
e coating was investigated at 1000 degreesC in air by TGA, and SEM in compa
rison with cast NiAl and NiAlY alloys. Results indicate that, for the cast
NiAl alloy, mass loss is observed at about 40 cycles, implying the serious
spallation occurred, while no spallation is detected for NiAlY alloy and Ni
Al coating for the whole test period. It is evident that. the scale adhesio
n is improved by the microcrystallization and the addition of Y. (C) 2001 E
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