The effect of oxygen doping content on the oxidation resistance of NiCrAlYN nano-cermet coatings at 1100 ℃ was investigated. Three coatings with different oxygen doping were prepared by multi-arc ion plating with O

2

flow rates at 0

10 sccm

and 20 sccm

respectively. After high-temperature at 1100 ℃ for 300 h

α–Al

2

O

3

and NiAl

2

O

4

were formed on the surface of three coatings. The thickness of the oxide scales was 8.78 μm

7.9 μm

and 5.7 μm

respectively. The oxide scales of the coatings deposited at 0 and 10 sccm showed significant delamination with the upper la

yer of NiAl

2

O

4

and the inner layer of α–Al

2

O

3

while this was not observed on the coating deposited at 20 sccm. The increase of oxygen doping content in nano cermets could effectively inhibit the formation of large particles of Y–Al oxide contaminant in the oxide scales and thus decrease the growth rate of the oxide scales. After oxidation

the oxygen containing coatings degraded more slowly than that without oxygen doping

which is mainly attributed to the beneficial effect of dispersed oxide particles in oxygen containing coatings on inhibiting the degradation of the coatings.