Effect of Tribo-Oxidation on Friction and Wear Behaviour of HVOF Sprayed WC–10Co–4Cr Coating

Effect of Tribo-Oxidation on Friction and Wear Behaviour of HVOF Sprayed WC–10Co–4Cr Coating The effect of tribo-chemical reactions under varying sliding speed and load conditions on the friction and abrasive wear response of high-velocity oxy-fuel-sprayed WC–10Co–4Cr coating was studied. The abrasive wear rate and friction coefficient decreased with the increase in sliding speed while friction coefficient displayed increasing trend with increase in load. The decrease in friction coefficient and wear rate was attributed to formation of tribo-oxides and surface films with good lubricating properties. Severity of abrasive wear increased with increasing load which was associated with transition in wear mechanisms from plastic deformation and fatigue to delamination cracking, intergranular fracture and splat fracture. Increase in friction coefficient with load irrespective of sliding speed was due to increasing contribution of fracture-assisted mechanical wear as compared to oxidative wear. The nature, composition and properties of tribo-films imparted crucial role to influencing friction and abrasive wear of WC–10Co–4Cr coating. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Tribology Letters Springer Journals

Effect of Tribo-Oxidation on Friction and Wear Behaviour of HVOF Sprayed WC–10Co–4Cr Coating

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Publisher
Springer Journals
Copyright
Copyright © 2018 by Springer Science+Business Media, LLC, part of Springer Nature
Subject
Materials Science; Tribology, Corrosion and Coatings; Surfaces and Interfaces, Thin Films; Theoretical and Applied Mechanics; Physical Chemistry; Nanotechnology
ISSN
1023-8883
eISSN
1573-2711
D.O.I.
10.1007/s11249-018-1006-1
Publisher site
See Article on Publisher Site

Abstract

The effect of tribo-chemical reactions under varying sliding speed and load conditions on the friction and abrasive wear response of high-velocity oxy-fuel-sprayed WC–10Co–4Cr coating was studied. The abrasive wear rate and friction coefficient decreased with the increase in sliding speed while friction coefficient displayed increasing trend with increase in load. The decrease in friction coefficient and wear rate was attributed to formation of tribo-oxides and surface films with good lubricating properties. Severity of abrasive wear increased with increasing load which was associated with transition in wear mechanisms from plastic deformation and fatigue to delamination cracking, intergranular fracture and splat fracture. Increase in friction coefficient with load irrespective of sliding speed was due to increasing contribution of fracture-assisted mechanical wear as compared to oxidative wear. The nature, composition and properties of tribo-films imparted crucial role to influencing friction and abrasive wear of WC–10Co–4Cr coating.

Journal

Tribology LettersSpringer Journals

Published: Mar 1, 2018

References

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