R. Ahmed
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.
Authors
O. Ali
Professor Nadimul Faisal N.H.Faisal@rgu.ac.uk
Professor
N.M. Al-Anazi
S. Al-Mutairi
F.-L. Toma
L.-M. Berger
A. Potthoff
M.F.A. Goosen
Abstract
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.
Citation
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: https://doi.org/10.1016/j.wear.2014.10.021
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 |
DOI | https://doi.org/10.1016/j.wear.2014.10.021 |
Keywords | Nanostructured coating; Sliding wear; WC-Co coating; Suspenssion spraying; Tribology |
Public URL | http://hdl.handle.net/10059/1341 |
Files
AHMED 2015 Sliding wear investigation
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Publisher Licence URL
https://creativecommons.org/licenses/by-nc-nd/4.0/
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