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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...
A Ni+CrAlYSiN composite coating was prepared on a Ni-based superalloy K417 by vacuum arc evaporation, mainly consists of nanocrystalline γ-Ni, fcc-AlN and fcc-CrN. The oxidation behaviour of the specimens in air at 1000°C for 100h was studied. A double-layer oxide scale, inner Al 2 O 3 layer and outer mixture layer mainly dominated by NiCr 2 O 4 , formed on the composite...
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