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Coatings 2011, 1(1), 3-16; doi:10.3390/coatings1010003
Article

Improvement of the Oxidation Resistance of CoNiCrAlY Bond Coats Sprayed by High Velocity Oxygen-Fuel onto Nickel Superalloy Substrate

1,* , 1, 2, 3, 3 and 1
Received: 1 October 2010; in revised form: 28 October 2010 / Accepted: 23 November 2010 / Published: 26 November 2010
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Abstract: CoNiCrAlY powders with similar granulometry and chemical composition, but different starting reactivity toward oxygen, were sprayed onto superalloy substrates by High Velocity Oxygen-Fuel producing coatings of similar thicknesses. After spraying, samples were maintained at 1,273 K in air for different test periods of up to 5,000 hours. Morphological, microstructural, compositional and electrochemical analyses were performed on the coated samples in order to assess the high temperature oxidation resistance provided by the two different powders. The powder with higher starting reactivity towards oxygen improves the oxidation resistance of the coated samples by producing thinner and more adherent thermally grown oxide layers.
Keywords: high velocity oxyfuel (HVOF); oxidation; superalloy; bond coat; protective coating high velocity oxyfuel (HVOF); oxidation; superalloy; bond coat; protective coating
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Fossati, A.; Ferdinando, M.D.; Lavacchi, A.; Scrivani, A.; Giolli, C.; Bardi, U. Improvement of the Oxidation Resistance of CoNiCrAlY Bond Coats Sprayed by High Velocity Oxygen-Fuel onto Nickel Superalloy Substrate. Coatings 2011, 1, 3-16.

AMA Style

Fossati A, Ferdinando MD, Lavacchi A, Scrivani A, Giolli C, Bardi U. Improvement of the Oxidation Resistance of CoNiCrAlY Bond Coats Sprayed by High Velocity Oxygen-Fuel onto Nickel Superalloy Substrate. Coatings. 2011; 1(1):3-16.

Chicago/Turabian Style

Fossati, Alessio; Ferdinando, Martina Di; Lavacchi, Alessandro; Scrivani, Andrea; Giolli, Carlo; Bardi, Ugo. 2011. "Improvement of the Oxidation Resistance of CoNiCrAlY Bond Coats Sprayed by High Velocity Oxygen-Fuel onto Nickel Superalloy Substrate." Coatings 1, no. 1: 3-16.


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