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

2010; Maney Publishing; Volume: 26; Issue: 6 Linguagem: Inglês

10.1179/026708410x12593178265706

1743-2944

Luíz Carlos Casteletti, Eduardo Augusto Brefere Arnoni, Amadeu Lombardi Neto, Frederico Augusto Pires Fernandes, George E. Totten,

Diamond and Carbon-based Materials Research

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.