Effects of the dispersion time on the microstructure and wear resistance of WC/Co-CNTs HVOF sprayed coatings

Rodrı́guez, M.; Gil, Linda; Camero, Sonia; Fréty, Nicole; Santana, Y.Y.; Caro, J.

doi:10.1016/j.surfcoat.2014.10.014

Cited by 29 publications

(29 citation statements)

References 39 publications

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“…The multimodal WC-Co coating composed of nano and micro WC particles, on the other hand, presents lower decarburization and total cost as compared to the nano WC-Co coatings [21][22][23]. Compared with the conventional WC-Co coatings, multimodal WC coatings offer a denser structure, higher abrasive wear resistance and anti-cavitation performance [24][25][26]. For example, by comparing the microstructure and surface properties of conventional and nano WC-Co coatings, Zhao et al [27] concluded lower porosity, higher microhardness and fracture toughness could result from the nano coatings.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Cavitation Erosion Resistance of HVOF Deposited WC-Co Coatings with Different Sized WC

Ding

Yuan

et al. 2018

Coatings

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Conventional, multimodal and nanostructured WC-12Co coatings with different WC sizes and distributions were prepared by high velocity oxy-fuel spray (HVOF). The micrographs and structures of the coatings were analyzed by scanning electron microscope (SEM), X-ray diffractometer (XRD) et al. The porosity, microhardness and fracture toughness of the WC-Co coatings were measured. The coating resistance to cavitation erosion (CE) was investigated by ultrasonic vibration cavitation equipment and the cavitation mechanisms were explored. Results show that there is serious WC decarburization in nanostructured and multimodal WC-Co coatings with the formation of W2C and W phases. The nanostructured WC-Co coating has the densest microstructure with lowest porosity compared to the other two WC-Co coatings, as well as the highest fracture toughness among the three coatings. It was also discovered that the nanostructured WC-Co coating exhibits the best CE resistance and that the CE rate is approximately one-third in comparison with conventional coating.

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Section: Introductionmentioning

confidence: 99%

Microstructure and Cavitation Erosion Resistance of HVOF Deposited WC-Co Coatings with Different Sized WC

Ding

Yuan

et al. 2018

Coatings

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“…After heat treatment at 500°C, comparing with the as-sprayed coating, phase structure of the former had almost no change. After heat treatment at 700°C, the XRD peak intensity of W 2 C phase decreased, amorphous Co phases recrystallized (Ref [16][17][18][19][20][21][22][23][24][25][26][27][28][29] and new Co 3 W 3 C (Ref 21-23) and Co 6 W 6 C phases generated. After heat treatment at 900°C, all W 2 C, Co 3 W 3 C, and W phases were nearly completely transformed into the Co 6 W 6 C phases with a small amount of Co phases.…”

Section: Electrochemical Measurementsmentioning

confidence: 99%

Influence of Heat Treatment on Corrosion Resistance of High-Velocity Oxygen-Fuel Sprayed WC-17Co Coatings on 42CrMo Steel

Sun

Zhang

et al. 2015

J. of Materi Eng and Perform

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The influence of heat treatment from 500 to 1100°C on the 5 wt.% H 2 SO 4 solution-induced corrosion resistance of high-velocity oxygen-fuel sprayed WC-17Co coatings on 42CrMo steel was investigated, by using x-ray diffractometer (XRD), scanning electron microscopy (SEM)-energy-dispersive spectrometer (EDS), and polarization curve methods. XRD analysis showed decrease in W 2 C phase intensity with recrystallization of amorphous Co and generation of new Co 3 W 3 C and Co 6 W 6 C phases with heat treatment. Porosity distribution did not follow a particular pattern; it initially increased and then decreased with increasing temperature. Corrosion resistance sequence of the as-sprayed and heat-treated coatings in 5 wt.% H 2 SO 4 solution was C-5 > C-9 > C-A > C-7 > C-11. Furthermore, microstructure and phase structure of heat-treated coatings revealed the formation of different discontinuous plate-like oxide films on the surface of the heat-treated coatings which indicated the vital effect of binder structure on the corrosion resistance.

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“…Ma et al [9] and Matteo Federici et al [10] report that among the various thermal spraying techniques, the HVOF process is known for its high kinetic energy value and relatively low flame temperature. This favors the formation of an amorphous structure with decreased porosity and oxide content, resulting in better resistance to wear, corrosion and adhesion of coatings [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Comparison of abrasive wear by rice husk of an HVOF WC–Co–Cr-based coating and an electric arc sprayed coating based on Fe–Cr–B–Si

Panziera

Flores

Tier

et al. 2019

J Braz. Soc. Mech. Sci. Eng.

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The effect of abrasive wear is particularly relevant in the industrial areas of agriculture, mining, mineral processing and earth moving. Wear problems occur in mills and silos where grain is stored and moved in large quantities through the process of agro-processing. Machines and equipment that work under direct contact with the grain suffer from severe three-body abrasive wear from the rice husks. The main objective of this study was to investigate the abrasive wear behavior of an Fe-29Cr-4B-1.75Si coating sprayed by electric arc and a WC-10Co-4Cr coating applied by the high-velocity oxygen fuel (HVOF) methods. Both coatings used SAE 1016 carbon steel as the substrate. A dry-sand, rubber wheel abrasion test was performed using ASTM G65 standard that employs sand as an abradant. It was compared to a variation on that test that employed rice husk as the abradant. The coatings were characterized by scanning electron microscopy, X-ray diffraction and microhardness. The microhardness values for coatings and substrate were measured using a microhardness Vickers tester equipped with a diamond pyramid indenter. The results showed that the mechanisms of wear differ by the change of abrasive, characterizing a wear by scratches when using the sand, and by microcutting, ledges and cracks when the rice husk is used as an abradant. The WC-10Co-4Cr deposition by HVOF showed satisfactory performance under abrasive wear with rice husk demonstrating a potential for application in agricultural implements working in the rice culture.

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Effects of the dispersion time on the microstructure and wear resistance of WC/Co-CNTs HVOF sprayed coatings

Cited by 29 publications

References 39 publications

Microstructure and Cavitation Erosion Resistance of HVOF Deposited WC-Co Coatings with Different Sized WC

Microstructure and Cavitation Erosion Resistance of HVOF Deposited WC-Co Coatings with Different Sized WC

Influence of Heat Treatment on Corrosion Resistance of High-Velocity Oxygen-Fuel Sprayed WC-17Co Coatings on 42CrMo Steel

Comparison of abrasive wear by rice husk of an HVOF WC–Co–Cr-based coating and an electric arc sprayed coating based on Fe–Cr–B–Si

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