Skip to main content

Research Repository

Advanced Search

Influence of post-treatment on the microstructural and tribomechanical properties of suspension thermally sprayed WC-12 wt%Co nanocomposite coatings.

Ali, O.; Ahmed, R.; Faisal, N.H.; Alanazi, Nayef M.; Berger, L.-M.; Kaiser, A.; Toma, F.-L.; Polychroniadis, E.K.; Sall, M.; Goosen, M.F.A.; Elakwah, Y.O.

Authors

O. Ali

R. Ahmed

Nayef M. Alanazi

L.-M. Berger

A. Kaiser

F.-L. Toma

E.K. Polychroniadis

M. Sall

M.F.A. Goosen

Y.O. Elakwah



Abstract

The potential to improve the tribomechanical performance of HVOF-sprayed WC-12Co coatings was studied by using aqueous WC-12Co suspensions as feed-stock. Both as-sprayed and hot-isostatic-pressed (HIPed) coatings were studied. Mathematical models of wear rate based on the structure property relationships, even for the conventionally sprayed WC-Co hardmetal coatings, are at best based on the semiempirical approach. This paper aims to develop these semiempirical mathematical models for suspension sprayed nanocomposite coatings in as-sprayed and heat-treated (HIPed) conditions. Microstructural evaluations included transmission electron microscopy, X-ray diffraction and scanning electron microscopy equipped with energy-dispersive X-ray spectroscopy. The nanohardness and modulus of the coated specimens were investigated using a diamond Berkovich nanoindenter. Sliding wear tests were conducted using a ball-on-flat test rig. Results indicated that the HIPing post-treatment resulted in crystallization of amorphous coating phases and increase in elastic modulus and hardness. Influence of these changes in the wear mechanisms and wear rate is discussed. Results are also compared with conventionally sprayed high-velocity oxy-fuel hardmetal WC-Co coatings.

Citation

ALI, O., AHMED, R., FAISAL, N.H., ALANAZI, N.M., BERGER, L.-M., KAISER, A., TOMA, F.-L., POLYCHRONIADIS, E.K., SALL, M., ELAKWAH, Y.O. and GOOSEN, M.F.A. 2017. Influence of post-treatment on the microstructural and tribomechanical properties of suspension thermally sprayed WC-12 wt%Co nanocomposite coatings. Tribology letters [online], 65(2), article 33. Available from: https://doi.org/10.1007/s11249-017-0815-y

Journal Article Type Article
Acceptance Date Jan 4, 2017
Online Publication Date Jan 19, 2017
Publication Date Jun 30, 2017
Deposit Date Jun 9, 2017
Publicly Available Date Jun 9, 2017
Journal Tribology Letters
Print ISSN 1023-8883
Electronic ISSN 1573-2711
Publisher Springer
Peer Reviewed Peer Reviewed
Volume 65
Issue 2
Article Number 33
DOI https://doi.org/10.1007/s11249-017-0815-y
Keywords Nanostructured coating; Sliding wear; WC12Co coating; Suspension spraying; Hot isostatic pressuring (HIPing); Microstructure; Phase composition; Wear mechanism; Tribology
Public URL http://hdl.handle.net/10059/2371

Files





You might also like



Downloadable Citations