Journal
SURFACE & COATINGS TECHNOLOGY
Volume 202, Issue 14, Pages 3378-3384Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2007.12.028
Keywords
nanostructured coating; cold spray; NiCrAlY; isothermal oxidation; oxide evolution
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Nanostructured NiCrAlY bond coating was deposited using a milled powder by cold spraying. A shot-peening treatment was then applied to the as-sprayed coating to modify the coating surface morphology. The oxidation behavior of the coating with the as-sprayed surface and shot-peened surface was investigated under isothermal oxidation at 900 degrees C and 1000 degrees C for different times. The oxidation behavior of the coating was characterized through surface morphology and cross-sectional microstructure by scanning electron microscopy. R was found that a uniform oxide layer was formed on the surface of the shot-peened nanostructured NiCrAlY coating during oxidation at temperatures of 900 degrees C and 1000 degrees C. The surface morphology of the coating has significant effect on the morphology of the oxide. The surface geometry of the cold-sprayed MCrAlY coating must be modified to promote formation of a protective oxide film during oxidation, through application of a post-treatment process such as shot-peening. (c) 2007 Elsevier B.V. All rights reserved.
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