Abstract
In the present study a detailed investigation of modification of both carbide and binder phases in WC-1OCo (16·5% vol.) has been carried out in order to develop equivalent steel cutting grade hard metals. The hard phase, WC, was partially replaced by TiC and the binder phase, Co, by Ni and Mo. The volume percentage of hard phases WC and TiC were kept in all alloys as 63% and 20% respectively. Sintering studies were made in both a hydrogen atmosphere and a vacuum at different temperatures in the range 1450–1500°C. The partial substitution of cobalt in WC-8 TiC-12Co hard metal by nickel necessitated addition of molybdenum either in elemental or carbide form, the latter being a better proposition. The hard metal shows equivalent properties with those prepared using (W,Ti)C solid solution.
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