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The oxidations of low pressure plasma sprayed (LPPS) NiCrAlY coating on nickel base superalloy were studied at 1050℃ in flows of O2, and mixture of O2 and 5%H2O under atmospheric pressure. Oxide formed on the surface of LPPS NiCrAlY coating after oxidation at 1050℃ in pure O2 consisted of NiCr2O4, whereas oxide formed on the surface of LPPS NiCrAlY coating after oxidation at 1050℃ in a mixture of O2 and 5%H2O is mainly composed of NiO. The effect of water vapor on the characteristics of the oxide scale is attributed to the increase in Ni cation transport.
The oxidations of low pressure plasma sprayed (LPPS) NiCrAlY coating on nickel base superalloy were studied at 1050 ° C in flows of O2, and mixture of O2 and 5% H2O under atmospheric pressure. Oxide formed on the surface of LPPS NiCrAlY coating after oxidation at 1050 ℃ in pure O2 consisted of NiCr2O4, the oxide formed on the surface of LPPS NiCrAlY coating after oxidation at 1050 ℃ in a mixture of O2 and 5% H2O is mainly composed of NiO. The effect of water vapor on the characteristics of the oxide scale is attributed to the increase in Ni cation transport.