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EFFECT OF VACUUM HEAT TREATMENT ON OXIDATION RESISTANCE OF SPUTTERED NiCrAlY COATING ONA Ni-BASE SINGLE-CRYSTAL SUPERALLOY

Meiheng Li, Zhongyuan Zhang, Xiaofeng Sun

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Abstract

The influence of vacuum heat treatment on NiCrAlY coating,which was deposited on a Ni-base superalloy substrate by magnetron sputtering was investigated.It was shown that the sputtered NiCrAlY coating,which consisted of a two-phase mixture:γ-Ni and β-NiAl phase,had a homogeneous elemental distribution.After vacuum heat treatment,the sputtered NiCrAlY coating mainly consisted of γ′-Ni 3Al,β-NiAl,and trace of α-Al 2O 3 phases and the outermost layer of the sputtered NiCrAlY coating riched in Al and depleted in Cr.The sputtered NiCrAlY coating after vacuum heat treatment formed α-Al 2O 3 much earlier and the α-Al 2O 3 scale had a better adherence to the NiCrAlY coating.Therefore vacuum heat treatment improved the oxidation resistance of sputtered NiCrAlY coating.

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What this paper is about

The influence of vacuum heat treatment on NiCrAlY coating,which was deposited on a Ni-base superalloy substrate by magnetron sputtering was investigated.It was shown that the sputtered NiCrAlY coating,which consisted of a two-phase mixture:γ-Ni and β-NiAl phase,had a homogeneous elemental distribution.After vacuum heat treatment,the sputtered NiCrAlY coating mainly consisted of γ′-Ni 3Al,β-NiAl,and trace of α-Al 2O 3 phases and the outermost layer of the sputtered NiCrAlY coating riched in Al and depleted in Cr.The sputtered NiCrAlY coating after vacuum heat treatment formed α-Al 2O 3 much earlier and the α-Al 2O 3 scale had a better adherence to the NiCrAlY coating.Therefore vacuum heat treatment improved the oxidation resistance of sputtered NiCrAlY coating.

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Available abstract

The influence of vacuum heat treatment on NiCrAlY coating,which was deposited on a Ni-base superalloy substrate by magnetron sputtering was investigated.It was shown that the sputtered NiCrAlY coating,which consisted of a two-phase mixture:γ-Ni and β-NiAl phase,had a homogeneous elemental distribution.After vacuum heat treatment,the sputtered NiCrAlY coating mainly consisted of γ′-Ni 3Al,β-NiAl,and trace of α-Al 2O 3 phases and the outermost layer of the sputtered NiCrAlY coating riched in Al and depleted in Cr.The sputtered NiCrAlY coating after vacuum heat treatment formed α-Al 2O 3 much earlier and the α-Al 2O 3 scale had a better adherence to the NiCrAlY coating.Therefore vacuum heat treatment improved the oxidation resistance of sputtered NiCrAlY coating.

Key concepts: Materials science, Superalloy, Coating, Nial, Metallurgy, Sputtering, Sputter deposition, Substrate (aquarium)

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EFFECT OF VACUUM HEAT TREATMENT ON OXIDATION RESISTANCE OF SPUTTERED NiCrAlY COATING ONA Ni-BASE SINGLE-CRYSTAL SUPERALLOY — Research Paper | ScholarLens