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Sliding wear investigation of suspension sprayed WC-Co nanocomposite coatings.

Ahmed, R.; Ali, O.; Faisal, N. H.; Al-Anazi, N.M.; Al-Mutairi, S.; Toma, F.-L.; Berger, L.-M.; Potthoff, A.; Goosen, M.F.A.


R. Ahmed

O. Ali

N.M. Al-Anazi

S. Al-Mutairi

F.-L. Toma

L.-M. Berger

A. Potthoff

M.F.A. Goosen


Sliding wear evaluation of nanostructured coatings deposited by Suspension High Velocity Oxy-Fuel (S-HVOF) and conventional HVOF (Jet Kote (HVOF-JK) and JP5000 (HVOF-JP)) spraying were evaluated. S-HVOF coatings were nanostructured and deposited via an aqueous based suspension of the WC-Co powder, using modified HVOF (TopGun) spraying. Microstructural evaluations of these hardmetal coatings included X-ray Diffraction (XRD) and Scanning Electron Microscopy (SEM) equipped with Energy Dispersive X-ray Spectroscopy (EDX). Sliding wear tests on coatings were conducted using a ball-on-flat test rig against steel, silicon nitride (Si3N4) ceramic and WC-6Co balls. Results indicated that nanosized particles inherited from the starting powder in S-HVOF spraying were retained in the resulting coatings. Significant changes in the chemical and phase composition were observed in the S-HVOF coatings. Despite decarburization, the hardness and sliding wear resistance of the S-HVOF coatings was comparable to the HVOF-JK and HVOF-JP coatings. The sliding wear performance was dependent on the ball-coating test couple. In general a higher ball wear rate was observed with lower coating wear rate. Comparison of the total (ball and coating) wear rate indicated that for steel and ceramic balls, HVOF-JP coatings performed the best followed by the S-HVOF and HVOF-JK coatings. For the WC-Co ball tests, average performance of S-HVOF was better than that of HVOF-JK and HVOF-JP coatings. Changes in sliding wear behavior were attributed to the support of metal matrix due to relatively higher tungsten content, and uniform distribution of nanoparticles in the S-HVOF coating microstructure. The presence of tribofilm was also observed for all test couples.


AHMED, R., ALI, O., FAISAL, N.H., AL-ANAZI, N.M., AL-MUTAIRI, S., TOMA, F.-L., BERGER, L.-M., POTTHOFF, A. and GOOSEN, M.F.A. 2015. Sliding wear investigation of suspension sprayed WC-Co nanocomposite coatings. Wear [online], 322-323, pages 133-150. Available from:

Journal Article Type Article
Acceptance Date Oct 31, 2014
Online Publication Date Nov 13, 2014
Publication Date Jan 15, 2015
Deposit Date Nov 11, 2015
Publicly Available Date Nov 14, 2015
Journal Wear
Print ISSN 0043-1648
Electronic ISSN 1873-2577
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 322-323
Pages 133-150
Keywords Nanostructured coating; Sliding wear; WC-Co coating; Suspenssion spraying; Tribology
Public URL


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