MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Growth Inhibition of Nano WC particles in WC-Co Alloys during Liquid-Phase Sintering
Osung SeoShinhoo KangEnrique J. Lavernia
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2003 Volume 44 Issue 11 Pages 2339-2345

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Abstract

WC-10Co-xVC alloys were produced using two different sizes of WC powders (200 nm and 4.4 μm) via planetary milling and a liquid-phase sintering technique. When VC was added to the WC-Co alloys, the growth of WC particles was effectively suppressed. However, this process was dependent on the amount of additive used. Since the average WC particle size became less than 1 μm, the system experienced a significant loss in carbon, resulting in the formation of an undesirable η phase. The goal of this study was to determine the role of VC in controlling growth and to verify its effectiveness as a function of average WC size and inhibitor content. It was found from XRD and HREM studies that the (W,M)C phase was formed in WC-10Co-xVC-C systems. The effect of V or VC on the solubility of W in the Co matrix was also examined using HREM/EDS. The findings indicate that the presence of VC tends to reduce the solubility of W in a Co melt, thus inhibiting the dissolution and growth of WC.

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© 2003 The Japan Institute of Metals and Materials
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