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Title: NbC as grain growth inhibitor and carbide in WC-Co hardmetals
Authors: Huang, Shuigen ×
Liu, R.L.
Li, L.
Van der Biest, Omer
Vleugels, Jef #
Issue Date: 2008
Publisher: Elsevier sci ltd
Series Title: International journal of refractory metals & hard materials vol:26 issue:5 pages:389-395
Abstract: WC-NbC-12 wt%Co hardmetals with 0.45-60 wt%NbC were prepared by solid state pulsed electric current sintering (PECS), also known as spark plasma sintering (SPS), for 2 min at 1240 degrees C and conventional sintering (CS) for 1 h at 1420 degrees C. The role of NbC as grain growth inhibitor and major carbide addition was investigated in terms of the densification behaviour, the microstructure and mechanical properties. Experimental work revealed that the addition of more than 5 wt%NbC inhibits pressure assisted solid-state densification compared to WC-Co based hardmetals. The addition of NbC limits WC grain growth during PECS and conventional sintering, whereas substantial (Nb, W)C grain growth was observed in the hardmetals with >= 0.9 wt%NbC addition. The influence of the NbC content on the hardness, strength and toughness of the WC-NbC-12 wt%Co hardmetals was explained in terms of WC grain growth inhibition and the formation of coarse (Nb, W)C grains. (C) 2007 Elsevier Ltd. All rights reserved.
URI: 
ISSN: 0263-4368
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Department of Materials Engineering - miscellaneous
Physical Metallurgy and Materials Engineering Section (-)
× corresponding author
# (joint) last author

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