Numerical Study to Examine the Effect of Porosity on In-Flight Particle Dynamics

High velocity oxygen fuel (HVOF) thermal spray has been widely used to deposit hard composite materials such as WC-Co powders for wear-resistant applications. Powder morphology varies according to production methods while new powder manufacturing techniques produce porous powders containing air void...

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Bibliographic Details
Published in:Journal of thermal spray technology 2011-03, Vol.20 (3), p.630-637
Main Authors: Kamnis, S., Gu, S., Vardavoulias, M.
Format: Article
Language:English
Subjects:
Analytical Chemistry
Applied sciences
Cemented carbides
Characterization and Evaluation of Materials
Chemistry and Materials Science
Cobalt
Composite materials
Corrosion and Coatings
Exact sciences and technology
Flame spraying
Flight behavior
Machines
Manufacturing
Materials Science
Mathematical models
Metals. Metallurgy
Momentum transfer
Particulate composites
Peer Reviewed
Porosity
Processes
Production techniques
Sprayers
Sprays
Surface treatment
Surfaces and Interfaces
Temperature gradients
Thin Films
Tribology
Tungsten carbide
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Summary:High velocity oxygen fuel (HVOF) thermal spray has been widely used to deposit hard composite materials such as WC-Co powders for wear-resistant applications. Powder morphology varies according to production methods while new powder manufacturing techniques produce porous powders containing air voids which are not interconnected. The porous microstructure within the powder will influence in-flight thermal and aerodynamic behavior of particles which is expected to be different from fully solid powder. This article is devoted to study the heat and momentum transfer in a HVOF sprayed WC-Co particles with different sizes and porosity levels. The results highlight the importance of thermal gradients inside the particles as a result of microporosity and how HVOF operating parameters need to be modified considering such temperature gradient.
ISSN:1059-9630
1544-1016
DOI:10.1007/s11666-010-9606-9