Abstract
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 °C and 1000 °C for different times. The oxidation behavior of the coating was characterized through surface morphology and cross-sectional microstructure by scanning electron microscopy. It 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 °C and 1000 °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.
| Original language | English |
|---|---|
| Pages (from-to) | 3378-3384 |
| Number of pages | 7 |
| Journal | Surface and Coatings Technology |
| Volume | 202 |
| Issue number | 14 |
| DOIs | |
| State | Published - 15 Apr 2008 |
Keywords
- Cold spray
- Isothermal oxidation
- Nanostructured coating
- NiCrAlY
- Oxide evolution
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