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Article

Understanding the Influence of High Velocity Thermal Spray Techniques on the Properties of Different Anti-Wear WC-Based Coatings

Thermal Spray Centre, CPT, Departament CMiQF, Universitat de Barcelona, 08028 Barcelona, Spain
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Author to whom correspondence should be addressed.
Coatings 2020, 10(12), 1157; https://doi.org/10.3390/coatings10121157
Received: 15 October 2020 / Revised: 20 November 2020 / Accepted: 24 November 2020 / Published: 26 November 2020
(This article belongs to the Special Issue Surface Modification of Metals and Alloys)
This work analyzes the differences found in hard metal coatings produced by two high velocity thermal spray techniques, namely high velocity oxy-fuel (HVOF) and high velocity air-fuel (HVAF). Additionally, the effect of the metallic matrix and ceramic composition and the original carbide grain size on coating properties is compared to the most studied standard reference material sprayed by HVOF, WC-Co. For this evaluation, the physical properties of the coatings, including feedstock characteristics, porosity, thickness, roughness, hardness, and phase composition were investigated. Several characterization methods were used for this purpose: optical microscopy (OM), scanning electronic microscopy (SEM), Energy-dispersive X-ray spectroscopy (EDS), and X-ray Diffraction (XRD), among others. The final performance (abrasive wear and corrosion resistance) shown by the coatings obtained by these two methodologies was also analyzed. Thus, the abrasive wear resistance was analyzed by the rubber-wheel test, while the corrosion resistance was characterized with electrochemical methods. The characterization results obtained clearly showed that the coatings exhibit different microstructures according to feedstock powder characteristics (carbide grain size and/or composition) and the thermal spray process used for its deposition. Thus, the incorporation of WB to the cermet composition led to a high hardness coating, and the complementary hardness and toughness of the WC-Co coatings justify its better abrasion resistance. The presence of Ni on the metal matrix increases the free corrosion potential of the coating to more noble region. However, the WC-Co coatings show a lower corrosion rate and hence a higher protective performance than the rest of the coatings. View Full-Text
Keywords: thermal spray; HVOF; HVAF; WC-based coatings; cermet materials; wear resistance thermal spray; HVOF; HVAF; WC-based coatings; cermet materials; wear resistance
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MDPI and ACS Style

Garfias Bulnes, A.; Albaladejo Fuentes, V.; Garcia Cano, I.; Dosta, S. Understanding the Influence of High Velocity Thermal Spray Techniques on the Properties of Different Anti-Wear WC-Based Coatings. Coatings 2020, 10, 1157. https://doi.org/10.3390/coatings10121157

AMA Style

Garfias Bulnes A, Albaladejo Fuentes V, Garcia Cano I, Dosta S. Understanding the Influence of High Velocity Thermal Spray Techniques on the Properties of Different Anti-Wear WC-Based Coatings. Coatings. 2020; 10(12):1157. https://doi.org/10.3390/coatings10121157

Chicago/Turabian Style

Garfias Bulnes, Andrea, Vicente Albaladejo Fuentes, Irene Garcia Cano, and Sergi Dosta. 2020. "Understanding the Influence of High Velocity Thermal Spray Techniques on the Properties of Different Anti-Wear WC-Based Coatings" Coatings 10, no. 12: 1157. https://doi.org/10.3390/coatings10121157

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