Influence of Surface Finishing on the Oxidation Behaviour of VPS MCrAlY Coatings

CoNiCrAlY coatings were produced by means of the vacuum plasma spraying (VPS) process onto CMSX-4 single crystal nickel superalloy disk substrates. As-sprayed samples were annealed at high temperatures in low vacuum. Three kinds of finishing processes were carried out, producing three types of sampl...

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Bibliographic Details
Published in:Journal of thermal spray technology 2012-03, Vol.21 (2), p.314-324
Main Authors: Fossati, Alessio, Di Ferdinando, Martina, Bardi, Ugo, Scrivani, Andrea, Giolli, Carlo
Format: Article
Language:English
Subjects:
Aluminum
Analytical Chemistry
Applied sciences
Characterization and Evaluation of Materials
Chemistry and Materials Science
Coatings
Corrosion
Corrosion and Coatings
Corrosion environments
Corrosion prevention
Exact sciences and technology
Finishing
High temperature
Machines
Manufacturing
Materials Science
Metallic coatings
Metals. Metallurgy
Nickel
Nickel base alloys
Oxidation
Oxidation resistance
Peer-Reviewed
Physical vapor deposition
Processes
Production techniques
Superalloys
Surface finishing
Surface treatment
Surfaces and Interfaces
Thin Films
Tribology
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Summary:CoNiCrAlY coatings were produced by means of the vacuum plasma spraying (VPS) process onto CMSX-4 single crystal nickel superalloy disk substrates. As-sprayed samples were annealed at high temperatures in low vacuum. Three kinds of finishing processes were carried out, producing three types of samples: as-sprayed, mechanically smoothed by grinding, ground and PVD coated by using aluminum targets in an oxygen atmosphere. Samples were tested under isothermal conditions, in air, at 1000 °C, and up to 5000 h. Morphological, microstructural and compositional analyses were performed on the coated samples in order to assess the high temperature oxidation behavior provided by the three different surface finishing processes. Several differences were observed: grinding operations decrease the oxidation resistance, whereas the PVD process can increase the performances over longer time with respect of the as-sprayed samples.
ISSN:1059-9630
1544-1016
DOI:10.1007/s11666-011-9705-2