Bonding mechanism from the impact of thermally sprayed solid particles
Bonding mechanism from the impact of thermally sprayed solid particles
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.
2664-2674
Gu, S.
a6f7af91-4731-46fe-ac4d-3081890ab704
Kamnis, S.
3ca869e0-8c18-4454-94f6-7fb4d2defa23
November 2009
Gu, S.
a6f7af91-4731-46fe-ac4d-3081890ab704
Kamnis, S.
3ca869e0-8c18-4454-94f6-7fb4d2defa23
Gu, S. and Kamnis, S.
(2009)
Bonding mechanism from the impact of thermally sprayed solid particles.
Metallurgical and Materials Transactions A, 40 (11), .
(doi:10.1007/s11661-009-9959-1).
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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Published date: November 2009
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Local EPrints ID: 149233
URI: http://eprints.soton.ac.uk/id/eprint/149233
ISSN: 1073-5623
PURE UUID: 9d2d000d-81e8-4592-beac-863246625ad1
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Date deposited: 04 May 2010 15:35
Last modified: 14 Mar 2024 01:05
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Author:
S. Gu
Author:
S. Kamnis
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