Effect of binders and surface finish on wear resistance of HVOF coatings

The high velocity oxygen fuel (HVOF) thermal spray process produces highly wear and/or corrosion resistant coatings. Tungsten carbide with a metallic binder is often used for this purpose. In this work, tungsten carbide coatings containing cobalt or nickel binder were produced by HVOF and characteri...

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Bibliographic Details
Published in:Surface engineering 2010-08, Vol.26 (6), p.440-446
Main Authors: Casteletti, L. C., Arnoni, E. A. B., Neto, A. Lombardi, Fernandes, F. A. P., Totten, G. E.
Format: Article
Language:English
Subjects:
Abrasion resistance
Binders
CERMETS
Coatings
ELECTRON MICROSCOPY
Flame spraying
OPTICAL MICROSCOPY
Protective coatings
Sand
THERMAL SPRAY COATINGS
THREE BODY ABRASION
Tungsten carbide
Wear resistance
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Summary:The high velocity oxygen fuel (HVOF) thermal spray process produces highly wear and/or corrosion resistant coatings. Tungsten carbide with a metallic binder is often used for this purpose. In this work, tungsten carbide coatings containing cobalt or nickel binder were produced by HVOF and characterised by optical and electron microscopy, hardness and a dry sand/rubber wheel abrasion test. The HVOF process produced dense coatings with low porosity levels and high hardness. The wear resistance of the specimens, which were surface treated, increased as the roughness percentage decreased. Tungsten carbide nickel based coating yielded the best wear resistance in the as sprayed condition. However, the wear rate and wear of the two coatings converged to the same values as the number of revolutions increased. Wear behaviour in the ground condition was similar, although the tungsten carbide cobalt based coating yielded better performance with increasing distance travelled during the wear test.
ISSN:0267-0844
1743-2944
DOI:10.1179/026708410X12593178265706