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Mechanical Properties and Microstructure of VPS and HVOF CoNiCrAlY Coatings

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Abstract

In this study, high velocity oxy-fuel (HVOF) and vacuum plasma spraying (VPS) coatings were sprayed using a Praxair (CO-210-24) CoNiCrAlY powder. Free-standing coatings underwent vacuum annealing at different temperatures for times of up to 840 h. Feedstock powder, and as-sprayed and annealed coatings, were characterized by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and x-ray diffraction (XRD). The hardness and Young’s modulus of the as-sprayed and the annealed HVOF and VPS coatings were measured, including the determination of Young’s moduli of the individual phases via nanoindentation and measurements of Young’s moduli of coatings at temperatures up to 500 °C. The Eshelby inclusion model was employed to investigate the effect of microstructure on the coatings’ mechanical properties. The sensitivity of the mechanical properties to microstructural details was confirmed. Young’s modulus was constant up to ~200 °C, and then decreased with increasing measurement temperature. The annealing process increased Young’s modulus because of a combination of decreased porosity and β volume fraction. Oxide stringers in the HVOF coating maintained its higher hardness than the VPS coating, even after annealing.

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Acknowledgments

The authors express their thanks to Dr. Nicola Everitt and Mike Davies—both of the Materials, Mechanics and Structures Research Division, Faculty of Engineering, The University of Nottingham—for carrying out the nanoindentation experiment. The authors thank also Prof. T.W. Clyne and Mr. K.A. Roberts of the University of Cambridge for their assistance in carrying out plasma spraying and providing the relevant experimental details.

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  1. Materials, Mechanics and Structures Research Division, Faculty of Engineering, The University of Nottingham, Nottingham, NG7 2RD, UK

    S. Saeidi, K. T. Voisey & D. G. McCartney

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  1. S. Saeidi
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  2. K. T. Voisey
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  3. D. G. McCartney
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Correspondence to K. T. Voisey.

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Saeidi, S., Voisey, K.T. & McCartney, D.G. Mechanical Properties and Microstructure of VPS and HVOF CoNiCrAlY Coatings. J Therm Spray Tech 20, 1231–1243 (2011). https://doi.org/10.1007/s11666-011-9666-5

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  • DOI: https://doi.org/10.1007/s11666-011-9666-5

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