Cold spraying of WC-Co-Ni coatings using porous WC-17Co powders
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S. Yin, T. Lupton, M. Meyer, R. Lupoi, Cold spraying of WC-Co-Ni coatings using porous WC-17Co powders, International Thermal Spray Conference (ITSC), Dusseldorf, Germany, 6-9 June 2017, 2017, 761 - 765Download Item:
Abstract:
Cold spray has been successfully used to produce WC-Co coatings in recent years, showing great potential. However, due to the lack of sufficient Comatrix phase for plastic deformation, the fabrication of cold sprayed WC-Co coating naturally requires expensive propulsive gas or very high working parameters, significantly increasing the manufacturing difficulty and cost.This paper aims to use conventional highpressure cold spray to fabricate high-performance and cost-effective WC-Co-Ni coatings, and to clarify its formation mechanism.To achieve this objective, mechanically mixed porous WC-17Coand dense Ni powders were selected as the feedstock with differentWC mass fraction, F1 (41.5 wt.%), F2 (64.5 wt.%) and F3 (74.7 wt.%).Working parameters were set at a moderatelevel (nitrogen, 3.0MPa and 350°C)to controlthe experimentalcost. Experimental results showed that WC reinforcementshad no phase transformation and were completely retained in the WC-Co-Ni coatings. The highest WC mass fractionwas present in the F3 coating,reachingapproximately 75% (equivalent to the feedstock), quite close to the cold sprayed WC-25Co coating. Fracture of WC-Co particles during the depositionprocesswas found to be the reason for such high WC retainability, dominating the coating formation mechanism.
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http://people.tcd.ie/lupoirhttp://people.tcd.ie/yins
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PUBLISHEDDusseldorf, Germany
Author: Lupoi, Rocco; Yin, Shuo
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International Thermal Spray Conference (ITSC)Type of material:
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Cold spray, Coatings, WC-Co-Ni coatingsMetadata
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