| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1468961 | Corrosion Science | 2014 | 9 Pages |
•Ni + CrAlYSiN and NiCrAlYSi coatings improved the cyclic oxidation resistance of K417.•Crack/spalling of thermally grown oxide (TGO) of NiCrAlYSi coatings occurred.•Neither spallation nor cracking was observed on the Ni + CrAlYSiN coated specimens.•Interdiffusion between the coatings and the substrate was observed.•An AlN layer inhibited interdiffusion between the Ni + CrAlYSiN coatings and substrate.
Ni + CrAlYSiN nanocomposite coatings and NiCrAlYSi coatings were prepared on a nickel-based superalloy K417 by vacuum arc evaporation. Both coatings exhibited excellent cyclic oxidation resistance at 1000 °C for 200 1-h cycles. Cracking/spallation of thermally grown oxide (TGO) scale occurred only on NiCrAlYSi coatings, due to the lower thermal stresses level in the TGO on Ni + CrAlYSiN coatings. An hcp-AlN interlayer eliminated the interdiffusion between the nanocomposite coating and substrate. The thickness of the TGO scale on NiCrAlYSi coatings was twice that of the scale on the AlN/Ni + CrAlYSiN coatings, probably due to the crack and healing effect.
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