The development of sub-surface damage during high energy solid particle erosion of a thermally sprayed WC–Co–Cr coating

Barber, J.; Mellor, B.G.; Wood, R.J.K.

doi:10.1016/j.wear.2005.02.008

Cited by 58 publications

(15 citation statements)

References 15 publications

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“…Specifically, the largest increase in hardness occurs from 2 to 3 torch scans, whereas, at higher number of scans, the increase is less remarkable. The hardness of the 2-scan coating is significantly lower than the values reported in the pertinent literature for analogous HVOF-sprayed WC-CoCr coatings [13,25], whereas the hardness of the coatings with 3 or more scans approaches or overcomes 1100HV 0.1 , which is comparable to goodquality cermet coatings [13,25]. The presence or absence of the Ni bond coat (samples with bond coat are identified by the label "bc") does not affect the hardness of WC-CoCr layers significantly, except, maybe, for the 2-scan coating.…”

Section: Microstructural and Micromechanical Characterizationmentioning

confidence: 62%

HVOF-sprayed WC–CoCr coatings on Al alloy: Effect of the coating thickness on the tribological properties

Bolelli

Lusvarghi

Barletta

2009

Wear

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a b s t r a c tThe microstructure, the micromechanical properties, the wear behaviour and the impact resistance of WC-CoCr cermet coatings, deposited onto an aluminium alloy substrate by High Velocity Oxygen-Fuel (HVOF) flame-spraying, were examined as a function of the coating thickness, which was varied between 50 m and 150 m by performing different numbers of scans of the HVOF torch in front of the substrate. The coatings became denser and significantly harder as the number of torch scans increased: the analysis of single WC-CoCr splats by combined SEM and Focused Ion Beam (FIB) techniques enabled the interpretation of the mechanisms underlying this phenomenon. In accordance to such densification, the sliding wear resistance increased with the number of torch scans, as abrasive grooving and brittle failure mechanisms were progressively suppressed. The resistance to cyclic impact was also enhanced. In comparison to anodised films, the WC-CoCr coatings appeared much more resistant against wear and cyclic impact; specifically, three torch scans seem enough to produce a coating having suitable characteristics.

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Section: Microstructural and Micromechanical Characterizationmentioning

confidence: 62%

HVOF-sprayed WC–CoCr coatings on Al alloy: Effect of the coating thickness on the tribological properties

Bolelli

Lusvarghi

Barletta

2009

Wear

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“…Further, these two coatings also exhibit significant interlamellar interface damages. As part of the impact energy is transferred through the thickness of the coatings, it gets distributed at the inter-lamellar interfaces, and a significant amount of the energy is consumed in the opening of these interfaces [27]. Depending on their character, the response and affected zone is different.…”

Section: Impactmentioning

confidence: 99%

Nature inspired, multi-functional, damage tolerant thermal spray coatings

Smith

Resnick

Flynn

et al. 2016

Surface and Coatings Technology

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Design and fabrication of ceramic materials that simultaneously provide adequate strength and toughness is of importance of in engineering applications. Nature has demonstrated that it is feasible to achieve this duality in properties through a combination of materials and microstructural engineering. The nacreous layer within the abalone shell is perhaps the most notable demonstration of such combined properties through unique combination of ceramic and polymeric material in an ordered, layered assembly. Recent studies have shown that through appropriate control of thermal spray processes and post-spray polymer infiltration of the deposited ceramic, it is possible, to some extent, to harness nacre"s microstructural attributes resulting in the material's dramatic improvements in both strength and toughness. This paper seeks to build upon previous work of layered, natural inspired design seen in nacreous materials, with an emphasis on examining their abrasion and contact damages. Two distinct thermal spray ceramic templates, one nacreous analogue and one standard thermal spray template, have been reproduced here and evaluated with regards to their functional performance e.g. abrasive wear © 2016. This manuscript version is made available under the Elsevier user license http://www.elsevier.com/open-access/userlicense/1.0/ 2 and particle impact. The results from this study confirm the mechanical property improvements after polymer infiltration, and further show that it is indeed feasible to achieve spray coatings improved surface properties from natural design principles and processing innovations.

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“…The Based on these findings, it can be inferred that the hardness of WS coatings affects the wear property of them more strongly. Previous studies (Ref [24][25][26] about erosion of thermal sprayed cermet coatings described the erosion mechanism as follows. The first is microcutting and microploughing of the soft binder by hard erodent particles.…”

Section: Erosionmentioning

confidence: 99%

Effects of Particle Strength of Feedstock Powders on Properties of Warm-Sprayed WC-Co Coatings

et al. 2011

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Warm spray (WS) process, which can control the temperature of a combustion gas jet used to propel powder, has been successfully applied to deposit WC-Co coatings. Detrimental reactions resulting from dissolution of WC into Co binder and decarburization were suppressed effectively by keeping the WC-Co particlesÕ temperature below the m.p. of the binder phase. In this study, three nano-structured WC-12Co powders with different particle strengths were prepared by changing the sintering conditions of spray-dried powder and were deposited by WS. The deposition efficiency and porosity of the coatings decreased with increasing the particle strength. The coating deposited from the powder with very low particle strength showed significant phase changes, while those deposited from the higher particle strengths showed almost no change. Particle Image Velocimetry revealed significant disintegration of the weakest powder, which explains the changes observed. The hardness and wear properties of the former coating, therefore, were inferior to the other two.

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The development of sub-surface damage during high energy solid particle erosion of a thermally sprayed WC–Co–Cr coating

Cited by 58 publications

References 15 publications

HVOF-sprayed WC–CoCr coatings on Al alloy: Effect of the coating thickness on the tribological properties

HVOF-sprayed WC–CoCr coatings on Al alloy: Effect of the coating thickness on the tribological properties

Nature inspired, multi-functional, damage tolerant thermal spray coatings

Effects of Particle Strength of Feedstock Powders on Properties of Warm-Sprayed WC-Co Coatings

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