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• Fossati, A
• Ferdinando, M
• Lavacchi, A
• Scrivani, A
• Giolli, C
• Bardi, U
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• Fossati, A
• Ferdinando, M
• Lavacchi, A
• Scrivani, A
• Giolli, C
• Bardi, U
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• Fossati, A
• Ferdinando, M
• Lavacchi, A
• Scrivani, A
• Giolli, C
• Bardi, U

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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

Alessio Fossati ^1,* , Martina Di Ferdinando ¹ , Alessandro Lavacchi ² , Andrea Scrivani ³ , Carlo Giolli ³  and Ugo Bardi ¹

¹ Consorzio Interuniversitario Nazionale per la Scienza e Tecnologia dei Materiali (INSTM), Via G. Giusti 9, 50121 Firenze, Italy ² Istituto di Chimica dei Composti Organometallici (ICCOM-CNR), Via Madonna del Piano 10, 50019 Sesto Fiorentino, Italy ³ Turbocoating SpA, Via Mistrali 7, 43040 Rubbiano di Solignano, Parma, Italy

* Author to whom correspondence should be addressed.

Received: 1 October 2010; in revised form: 28 October 2010 / Accepted: 23 November 2010 / Published: 26 November 2010

Download PDF Full-Text [1841 KB, uploaded 26 November 2010 17:57 CET]

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

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