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Fabrication of WC-based Metal Matrix Composite Coatings via Low-pressure Cold Spraying for Enhanced Surface Properties Open Access


Other title
Wear Rate
Mean Free Path
Metal Matrix Composite
Cold Spray
Type of item
Degree grantor
University of Alberta
Author or creator
Melendez, Natanael M
Supervisor and department
McDonald, Andre (Mechanical Engineering)
Examining committee member and department
Chung, Hyun-Joong (Chemical and Materials Engineering)
Fisher, Gary (Alberta Innovates Technology Futures)
McDonald, Andre (Mechanical Engineering)
Department of Mechanical Engineering

Date accepted
Graduation date
Master of Science
Degree level
A low-cost, low-pressure cold spray unit was used to fabricate tungsten carbide (WC)-based metal matrix composite (MMC) coatings. A variety of coatings were fabricated and characterized. Scanning electron microscopy (SEM), coupled with image analysis, Vickers micro-hardness, and X-ray diffraction (XRD) were used to characterize the coatings. Image analysis was used to determine the WC content in the coatings and the mean free path between the reinforcing particles. The WC content in the coating increased as the WC content in the powder blend increased. As the WC content in the powder increased, the coating porosity decreased and the WC deposition efficiency increased. ASTM standard G65-2004 dry abrasion testing was conducted on WC-Ni coatings to determine a relationship between hardness and wear resistance. A linear relationship was observed between the wear rate and hardness of the WC-Ni MMC coatings. The coating deemed optimal had a wear rate comparable to those of WC-Co coatings fabricated by high-velocity oxy-fuel (HVOF) and high-pressure cold spraying.
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
Citation for previous publication
N. Melendez, A. McDonald, “Development of WC-based Metal Matrix Composite Coatings using Low-pressure Cold Gas Dynamic Spraying”, Surf. Coat. Technol., 214, 2013, 101 – 109.N. Melendez, V. Narulkar, G. Fisher, A. McDonald, “The Effect of Reinforcing Particles on the Wear Rate of Low-pressure Cold-sprayed WC-based MMC Coatings”, Wear. Under review.

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