Thermal sprayed nanostructured WC/Co hardcoatings

Hardcoatings of WC/Co, produced by high-velocity oxy-fuel (HVOF) and air plasma spray (APS) deposition, have been studied. During HVOF deposition, nanostructured powder experiences more decarburization than conventional powder, whereas in APS deposition, just the opposite effect occurs This is expla...

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Bibliographic Details
Published in:Journal of thermal spray technology 2000-09, Vol.9 (3), p.399-406
Main Authors: KEAR, B. H, SADANGI, R. K, JAIN, M, YAO, R, KALMAN, Z, SKANDAN, G, MAYO, W. E
Format: Article
Language:English
Subjects:
Applied sciences
Cross-disciplinary physics: materials science
rheology
Decarburization
Deposition
Exact sciences and technology
Flame spraying
Materials science
Melting
Metals. Metallurgy
Methods of deposition of films and coatings
film growth and epitaxy
Nanocomposites
Nanostructure
Nanostructured materials
Physics
Plasma spraying
Reaction kinetics
Spray coating techniques
Sprayers
Sprays
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Summary:Hardcoatings of WC/Co, produced by high-velocity oxy-fuel (HVOF) and air plasma spray (APS) deposition, have been studied. During HVOF deposition, nanostructured powder experiences more decarburization than conventional powder, whereas in APS deposition, just the opposite effect occurs This is explained in terms of the influence of the highly porous, spherical-shell morphology of the nano-WC/Co particles on their melting characteristics and reaction kinetics. In particular, heterogeneous melting and localized superheating of the high-surface-area powder is considered to be a controlling factor in decarburization. The situation is further complicated in APS deposition by high-temperature vaporization of Co and C.
ISSN:1059-9630
1544-1016
DOI:10.1361/105996300770349863