Bonding Mechanism from the Impact of Thermally Sprayed Solid Particles |
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Authors: | S Gu S Kamnis |
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Affiliation: | (1) School of Engineering Science, University of Southampton, Highfield, Southampton, SO17 1BJ, United Kingdom |
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Abstract: | Power particles are mainly in solid state prior to impact on substrates from high velocity oxy-fuel (HVOF) thermal spraying.
The bonding between particles and substrates is critical to ensure the quality of coating. Finite element analysis (FEA) models
are developed to simulate the impingement process of solid particle impact on substrates. This numerical study examines the
bonding mechanism between particles and substrates and establishes the critical particle impact parameters for bonding. Considering
the morphology of particles, the shear-instability–based method is applied to all the particles, and the energy-based method
is employed only for spherical particles. The particles are given the properties of widely used WC-Co powder for HVOF thermally
sprayed coatings. The numerical results confirm that in the HVOF process, the kinetic energy of the particle prior to impact
plays the most dominant role in particle stress localization and melting of the interfacial contact region. The critical impact
parameters, such as particle velocity and temperature, are shown to be affected by the shape of particles, while higher impact
velocity is required for highly nonspherical powder. |
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