Particles Spreading Phenomena in the Case of Glass Thermal Spraying

The spreading phenomena of particles during thermal spraying are quite difficult to observe given the kinetics of the process. In this work, the splat formation of glass and alumina is theoretically compared, showing that glass transition and low-thermal conductivity yield a higher ratio between coo...

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Bibliographic Details
Published in:Journal of thermal spray technology 2008-12, Vol.17 (4), p.564-573
Main Authors: Poirier, Thierry, Planche, Marie Pierre, Landemarre, Olivier, Coddet, Christian
Format: Article
Language:English
Subjects:
Analytical Chemistry
Applied sciences
Characterization and Evaluation of Materials
Chemistry and Materials Science
Cooling
Corrosion and Coatings
Exact sciences and technology
Fluid dynamics
Fluid flow
Freezing
Glass
Glass transition
Hydrodynamics
Machines
Manufacturing
Materials Science
Metals. Metallurgy
Peer Reviewed
Processes
Production techniques
Spraying
Spreading
Surface treatment
Surfaces and Interfaces
Thermal conductivity
Thermal spraying
Thin Films
Transition temperatures
Tribology
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Summary:The spreading phenomena of particles during thermal spraying are quite difficult to observe given the kinetics of the process. In this work, the splat formation of glass and alumina is theoretically compared, showing that glass transition and low-thermal conductivity yield a higher ratio between cooling and flattening times, which strongly modifies their spreading behavior. Wipe tests show that splash—splat transition temperature can be modified by the glass composition and its subsequent hydrodynamic properties. The detection of peculiar remaining objects, such as fibers and wavelets shows the possibility of “freezing” some phenomena that are totally unobservable with crystalline oxides, except with high-velocity observations.
ISSN:1059-9630
1544-1016
DOI:10.1007/s11666-008-9211-3