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Particle loading effect in cold spray

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Abstract

Cold gas dynamic spray is a line-of-sight, high-rate material deposition process that uses a supersonic flow to accelerate small particles (micron-sized) above a material-dependent critical velocity. When the particles impact the substrate, they plastically deform and bond to form a coating. The objective of this research is to investigate the influence of the particle mass flow rate on the properties of coatings sprayed using the cold spray process. Varying the mass flow rate at which the feedstock particles are fed into the carrier gas stream can change the thickness of the coating. It was shown that poor coating quality (peeling) was not a result of flow saturation but, instead, the result of excessive particle bombardment per unit area on the substrate. By increasing the travel speed of the substrate, this can be overcome and well-bonded dense coatings can be achieved. It has also been shown that by heating the carrier gas flow poor coating quality is avoided.

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Authors and Affiliations

  1. Mechanical Engineering Department, University of Ottawa, Ottawa, ON, Canada

    K. Taylor & B. Jodoin

  2. Medical Device Bureau, Health Canada, Ottawa, ON, Canada

    J. Karov

Authors
  1. K. Taylor
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  2. B. Jodoin
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  3. J. Karov
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Additional information

The original version of this paper was published in the CD ROM Thermal Spray Comects: Explore Its Surfacing Potential, Interational Thermal Spray Conference, sponsored by DVS, ASM International, and HW International Institute of Welding, Basel, Switzerland, May 2–4, 2005, DVS-Verlag GmBH, Düsseldorf. Germany.

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Taylor, K., Jodoin, B. & Karov, J. Particle loading effect in cold spray. J Therm Spray Tech 15, 273–279 (2006). https://doi.org/10.1361/105996306X108237

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