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

Coatings

Alessio Fossati²  Martina Di Ferdinando²  Alessandro Lavacchi³  Andrea Scrivani¹  Carlo Giolli¹ 

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

关键词: high velocity oxyfuel (HVOF);    oxidation;    superalloy;    bond coat;    protective coating;   

DOI  :  10.3390/coatings1010003

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2010 by the authors; licensee MDPI, Basel, Switzerland.