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Suspension Plasma-Sprayed Alumina Coating Structures: Operating Parameters Versus Coating Architecture

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Abstract

Suspension plasma spraying (SPS) is able to process sub-micrometric-sized feedstock particles and permits the deposition of layers thinner (from 5 to 50 μm) than those resulting from conventional atmospheric plasma spraying (APS). SPS consists in mechanically injecting within the plasma flow a liquid suspension of particles of average diameter varying between 0.02 and 1 μm, average values. Upon penetration within the DC plasma jet, two phenomena occur sequentially: droplet fragmentation and evaporation. Particles are then processed by the plasma flow prior their impact, spreading and solidification upon the surface to be covered. Depending upon the selection of operating parameters, among which plasma power parameters (operating mode, enthalpy, spray distance, etc.), suspension properties (particle size distribution, powder mass percentage, viscosity, etc.), and substrate characteristics (topology, temperature, etc.), different coating architectures can be manufactured, from dense to porous layers. Nevertheless, the coupling between the parameters controlling the coating microstructure and properties are not yet fully identified. The aim of this study is to further understand the influence of parameters controlling the manufacturing mechanisms of SPS alumina coatings, particularly the spray beads influence.

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Authors and Affiliations

  1. SPCTS-UMR CNRS 6638, Faculty of Sciences, University of Limoges, 123 Avenue Albert Thomas, 87060, Limoges Cedex, France

    O. Tingaud, A. Grimaud, A. Denoirjean, G. Montavon, V. Rat, J.F. Coudert, P. Fauchais & T. Chartier

Authors
  1. O. Tingaud
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  2. A. Grimaud
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  3. A. Denoirjean
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  4. G. Montavon
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  5. V. Rat
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  6. J.F. Coudert
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  7. P. Fauchais
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  8. T. Chartier
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Corresponding author

Correspondence to G. Montavon.

Additional information

This article is an invited paper selected from presentations at the 2008 International Thermal Spray Conference and has been expanded from the original presentation. It is simultaneously published in Thermal Spray Crossing Borders, Proceedings of the 2008 International Thermal Spray Conference, Maastricht, The Netherlands, June 2-4, 2008, Basil R. Marple, Margaret M. Hyland, Yuk-Chiu Lau, Chang-Jiu Li, Rogerio S. Lima, and Ghislain Montavon, Ed., ASM International, Materials Park, OH, 2008.

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Tingaud, O., Grimaud, A., Denoirjean, A. et al. Suspension Plasma-Sprayed Alumina Coating Structures: Operating Parameters Versus Coating Architecture. J Therm Spray Tech 17, 662–670 (2008). https://doi.org/10.1007/s11666-008-9218-9

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  • DOI: https://doi.org/10.1007/s11666-008-9218-9

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