Low and high temperature hardness of WC-6 wt%Co alloys

Milman, Yu.V.; Chugunova, S. І.; Goncharuck, V.A; Luyckx, S.; Northrop, I.T.

doi:10.1016/s0263-4368(97)81231-0

Cited by 60 publications

(8 citation statements)

References 4 publications

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“…Recently, it has been reported (Ref 22) that under the stationary nozzle operation a significant heat transfer from the supersonic gas jet to the substrate occurs and the heat transfer could bring out a significant temperature increasing of the substrate, especially near the deposited top layer surface. Such temperature increasing of the deposited WC-Co layer would decrease the surface hardness of WC-Co ( Ref 23,24). As a result, the deformability of the WC-Co substrate on which WC-Co impacts will be enhanced.…”

Section: Discussionmentioning

confidence: 99%

Influence of Powder Porous Structure on the Deposition Behavior of Cold-Sprayed WC-12Co Coatings

Gao

2008

J Therm Spray Tech

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The limited deformation of hard cermet particles and impacted coating makes it difficult for conventional thermal spray powders to continuously build up on impact in cold spraying. In this study, three nanostructured WC-12Co powders with different porous structure and apparent hardness were employed to deposit WC-Co coatings on stainless steel substrate by cold spraying. The deposition characteristics of three powders of porosity from 44 to 5% were investigated. It was found that WC-Co coating is easily built-up using porous powders with WC particles bonded loosely and a low hardness. The microhardness of WC-12Co coatings varied from 400 to 1790 Hv with powders and spray conditions, which depends on the densification effects by impacting particles. With porous WC-Co powders, the fracture of particles on impact may occur and low deposition efficiency during cold spraying. The successful building up of coating at high deposition efficiency depends on the design of powder porous structure.

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Section: Discussionmentioning

confidence: 99%

Influence of Powder Porous Structure on the Deposition Behavior of Cold-Sprayed WC-12Co Coatings

Gao

2008

J Therm Spray Tech

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“…(4) to the above relationship, the hardness increases with a decreasing WC grain size. The above relationships between the WC grain size and the hardness of the WC-Co cemented carbides are supported by experimental data for the hardness of conventional carbides [10][11][12]. However, the above relationships predict that the hardness of cemented carbides increases continuously to infinity while decreasing the WC grain size to zero.…”

Section: Previous Theories On the Hardness Of Wc-co Cemented Carbidesmentioning

confidence: 64%

Analytical modeling to calculate the hardness of ultra-fine WC–Co cemented carbides

Seung

Lee

Ryu

et al. 2008

Materials Science and Engineering: A

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“…On the other hand, the reason for the slight drop in COF at 150°C may be due to the competing effects of lower viscosity and decrease in hardness of the liner specimen as the temperature increases. It has been previously reported that friction may decrease with increasing temperature due to decrease in the hardness of the material [40].…”

Section: Friction Test Results In Lubricated Conditionmentioning

confidence: 98%