Thermal Sprayed Nanostructured WC/Co Hardcoatings

Kear, B. H.; Sadangi, Rajendra; Jain, Mohit; Yao, R.; Kálmán, Z. H.; Skandan, Ganesh; Mayo, W. E.

doi:10.1361/105996300770349863

Cited by 58 publications

(17 citation statements)

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“…Contrary to earlier published research, [30,31] XRD analysis of the near-nanocrystalline coating showed no evidence of W 2 C phase formation ( Figure 5(b)). This suggested that extensive decarburization of WC during the spraying of the powder may have been prevented due to the use of the duplex Co coated WC-17Co powder used in this research.…”

Section: A Xrd Analysis Of the Coatingscontrasting

confidence: 99%

The Corrosion and Wear Performance of Microcrystalline WC-10Co-4Cr and Near-Nanocrystalline WC-17Co High Velocity Oxy-Fuel Sprayed Coatings on Steel Substrate

Saha

Khan

2010

Metall Mater Trans A

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The study of near-nanocrystalline cermet composite coating was performed by depositing near-nanocrystalline WC-17Co powder using the high velocity oxy-fuel spraying technique. The WC-17Co powder consists of a core with an engineered near-nano-scale WC dispersion with a mean grain size 427 nm. The powder particle contains 6 wt pct of the ductile phase Co matrix mixed into the core to ensure that the reinforcing ceramic phase WC material is discontinuous to limit debridement during wear, while the remainder of the binding phase (11 wt pct) is applied as a coating on the powder particle to improve the ductility. The tribological properties of the coating, in terms of corrosion resistance, microhardness, and sliding abrasive wear, were studied and compared with those of an industrially standard microcrystalline WC-10Co-4Cr coating with a WC mean grain size 3 lm. Results indicated that the WC-17Co coating had superior wear and corrosion resistance compared to the WC-10Co-4Cr coating. The engineered WC-17Co powder with a duplex Co layer had prevented significant decarburization of the WC dispersion in the coating, thereby reducing the intersplat microporosity necessary for initiating microgalvanic cells. The improved wear resistance was attributed to the higher hardness value of the near-nanocrystalline WC-17Co coating.

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Section: A Xrd Analysis Of the Coatingscontrasting

confidence: 99%

The Corrosion and Wear Performance of Microcrystalline WC-10Co-4Cr and Near-Nanocrystalline WC-17Co High Velocity Oxy-Fuel Sprayed Coatings on Steel Substrate

Saha

Khan

2010

Metall Mater Trans A

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“…As observed in the XRD patterns of both the WC-xNi and WC-12Co-xNi coatings presented in Figs. 4 and 5 respectively, the spray conditions applied did not cause decarburization, oxidation and phase changes typically observed in HVOF coatings [1,3,4,[6][7][8][9][10]. As a result, the chemical composition and bulk properties of the coatings typically remain identical to the parent powders.…”

Section: Discussionmentioning

confidence: 93%

“…The heat required to melt the binder phase often results in the deterioration of the carbide and binder phases by decarburization, phase changes, high temperature oxidation and grain growth [1][2][3][4][5][6][7]. Brittle and hard W 2 C, W and undesirable η phases are usually the result of this deterioration, which decreases the overall mechanical and wear properties of the coatings [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

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Cold gas dynamic spraying of WC–Ni cemented carbide coatings

Sacks

Botef

2015

International Journal of Refractory Metals and Hard Materials

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“…The WC-based coatings are generally deposited by flame, arc, plasma, or highvelocity oxy-fuel (HVOF) spraying, all of which require melting or partial melting of the feedstock powder constituents (Jacobs et al, 1998;Kear et al, 2000;Zikin et al, 2012). These high-temperature deposition processes may adversely affect the properties of the coating, as oxidation, decarburization, unwanted phase transformations, and tensile residual stresses may occur.…”

mentioning

confidence: 99%

Slurry abrasion of WC-4wt%Ni cold-sprayed coatings in synthetic minewater

Magagula¹,

Sacks²,

Botef³

2016

J. S. Afr. Inst. Min. Metall.

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Low-pressure cold gas dynamic spraying was used to deposit WC-4wt%Ni and WC-4wt%Ni-1wt%Mo coatings onto mild steel. Dense coatings with very low porosities were produced. No decarburization occurred during deposition and no deleterious phases were formed. The coatings were subjected to standardized material characterization tests, as well as slurry abrasion testing to assess their wear behaviour. The wear tests were conducted in synthetic minewater-silica slurries, while distilled watersilica slurries were used as a control. The hardness of the coatings, 512HV 0.3 and 458HV 0.3 for WC-4wt%Ni and WC-4wt%Ni-1wt%Mo respectively, are comparable to those achieved using high-temperature coating processes. The abrasion wear rates for both coatings were less than 5 mg/min and 10 mg/min in the distilled water-silica and synthetic mine water-silica slurries respectively. The approximately 50% increase in wear rate in the synthetic minewater slurry is attributed to a synergistic corrosive wear mechanism. The predominant wear mechanisms were identified as binder smearing and delamination, with carbide grain fracture and pull-out. tungsten carbide, nickel, cold spray, coatings, abrasion, minewater.

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Thermal Sprayed Nanostructured WC/Co Hardcoatings

Cited by 58 publications

References 1 publication

The Corrosion and Wear Performance of Microcrystalline WC-10Co-4Cr and Near-Nanocrystalline WC-17Co High Velocity Oxy-Fuel Sprayed Coatings on Steel Substrate

The Corrosion and Wear Performance of Microcrystalline WC-10Co-4Cr and Near-Nanocrystalline WC-17Co High Velocity Oxy-Fuel Sprayed Coatings on Steel Substrate

Cold gas dynamic spraying of WC–Ni cemented carbide coatings

Slurry abrasion of WC-4wt%Ni cold-sprayed coatings in synthetic minewater

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