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Open AccessFeature PaperArticle

Effect of Carbon Content on the Microstructure and Mechanical Properties of NbC-Ni Based Cermets

1
Department of Materials Engineering (MTM), KU Leuven, Kasteelpark Arenberg 44, B-3001 Heverlee, Belgium
2
Department of Mechanical Construction and Production, Ghent University, Technologiepark 903, 9052 Zwijnaarde, Belgium
3
NiobelCon bvba, B-2970 Schilde, Belgium
4
BAM Federal Institute for Materials Research and Testing, Division 6.3 Tribology & Wear Protection, Unter den Eichen 44-46, D-12203 Berlin, Germany
*
Author to whom correspondence should be addressed.
Metals 2018, 8(3), 178; https://doi.org/10.3390/met8030178
Received: 11 January 2018 / Revised: 21 February 2018 / Accepted: 6 March 2018 / Published: 12 March 2018
(This article belongs to the Special Issue Cermets and Hardmetals)
The aim of this work was to correlate the overall carbon content in NbC-Ni, NbC-Ni-VC and NbC-Ni-Mo starting powders with the resulting microstructure, hardness, and fracture toughness of Ni-bonded NbC cermets. A series of NbC-Ni, NbC-Ni-VC and NbC-Ni-Mo cermets with different carbon content were prepared by conventional liquid phase sintering for 1 h at 1420 °C in vacuum. Microstructural analysis of the fully densified cermets was performed by electron probe microanalysis (EPMA) to assess the effect of carbon and VC or Mo additions on the NbC grain growth and morphology. A decreased carbon content in the starting powder mixtures resulted in increased dissolution of Nb, V, and Mo in the Ni binder and a decreased C/Nb ratio in the NbC based carbide phase. The Vickers hardness (HV30) and Palmqvist indentation toughness were found to decrease significantly with an increasing carbon content in the Mo-free cermets, whereas an antagonistic correlation between hardness and toughness was obtained as a function of the Mo-content in Mo-modified NbC cermets. To obtain optimized mechanical properties, methods to control the total carbon content of NbC-Ni mixtures were proposed and the prepared cermets were investigated in detail. View Full-Text
Keywords: niobium carbide; cermet; hardmetal; liquid phase sintering; carbon; hardness niobium carbide; cermet; hardmetal; liquid phase sintering; carbon; hardness
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MDPI and ACS Style

Huang, S.; Baets, P.D.; Sukumaran, J.; Mohrbacher, H.; Woydt, M.; Vleugels, J. Effect of Carbon Content on the Microstructure and Mechanical Properties of NbC-Ni Based Cermets. Metals 2018, 8, 178.

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