Journal
SURFACE & COATINGS TECHNOLOGY
Volume 206, Issue 16, Pages 3508-3516Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2012.02.030
Keywords
HVOF; WC-12Co; Nanostructuring; Tribology; Aluminium alloying
Funding
- European GROWTH project Nanospraying [G5RD-CT-2002-00862]
- Katholieke Universiteit Leuven
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Nanostructured WC-Co and WC-Co-Al coatings, with about 300-mu m as-deposited coating thickness, were deposited by high velocity oxy-fuel (HVOF) spraying. Agglomerated nanostructured cermet powders produced by the Mechanomade (R) process was used for HVOF spraying. Dense and well-adherent coatings with crystal sizes below 30 nm were deposited on stainless steel 304 substrate. Porosity was less than 5% and the bond strength with the substrate was around 60 MPa. Experimental data on friction, wear, and abrasion resistance revealed that nanostructured WC-Co based coatings containing some Al as alloying element, exhibit improved tribological characteristics in comparison to nanostructured and micron-sized WC-Co coatings. This was attributed to a carbide particle distribution within the coating revealed by SEM, the absence of brittle W2C-like phases revealed by XRD, and the presence of Al at particle/matrix boundaries revealed by TEM. (C) 2012 Elsevier B.V. All rights reserved.
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