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Quality control of the intrinsic deposition efficiency from the controls of the splat morphologies and the deposit microstructure

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Abstract

A simple heuristic model was developed to demonstrate the major characteristics of impinging particles prior to impact and during the spreading stages. It is based on the determination of transfer functions be-tween the powder particle size distribution and splat equivalent diameter distributions. The input data consist mainly of the aforementioned distributions, determined experimentally using a particle size ana-lyzer for powder particle size analysis and the wipe test for splat equivalent diameter analysis. Output data relate to the major characteristics of the impinging particles: flattening degree, intrinsic deposition efficiency, impact velocity, etc. Comparisons of the model predictions with experimental data showed rea-sonable agreement. Implementation of this simple protocol provides understanding of interactions dur-ing the process and also has technological and economical impacts. It permits quality control (QC) of deposition efficiency by control of splat morphologies and aids in the definition of specifications for the powders used (for example, in terms of the lower and upper limits of the particle size distribution leading to the formation of a deposit with given processing parameters) allowing the optimization of the spray pa-rameters to obtain high-integrity deposits.

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Authors and Affiliations

  1. Laboratoire d’Études et de Recherches sur les Materiaux et les Propriétés de Surface, Institut Polytechnique de Sevenans, BP449, 90 010, Belfort Cedex, France

    G. Montavon & C. Coddet

  2. The Thermal Spray Laboratory, Depart-ment of Materials Science and Engineering, State University of New York at Stony Brook, 11794-2275, Stony Brook, NY, USA

    S. Sampath, H. Herman & C. C. Berndt

Authors
  1. G. Montavon
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  2. C. Coddet
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  3. S. Sampath
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  4. H. Herman
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  5. C. C. Berndt
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Montavon, G., Coddet, C., Sampath, S. et al. Quality control of the intrinsic deposition efficiency from the controls of the splat morphologies and the deposit microstructure. J Therm Spray Tech 6, 153–166 (1997). https://doi.org/10.1007/s11666-997-0007-7

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  • DOI: https://doi.org/10.1007/s11666-997-0007-7

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