Abstract
(Ti,V)C–Ni composite was sintered using ultrafine (Ti,V)C solid-solution powders prepared by mechanically alloying a Ti–V alloy/graphite powder mixture. The (Ti,V)C–Ni powders were sintered to full density at 1400°C, which is significantly lower than that required for the conventional liquid-phase sintering of TiC–Ni or Ti(CN)–Ni powders. The examination of linear shrinkage curve during sintering revealed that the consolidation of the (Ti,V)C–Ni composite proceeds in three distinct steps. Firstly, it shrinks by the solid-state sintering. Afterwards, it expands by CO gas evolution. Finally, Ni melt penetrates into the pores between carbide particles during the liquid-phase sintering. The fracture toughness values of the (Ti,V)C–Ni composite were notably higher than those of TiC–Ni or even Ti(CN)–WC–Ni composites. The improved fracture toughness of the (Ti,V)C–Ni composites is believed to originate from the solid-solution effect of TiC and VC in addition to the lack of core/rim structure, which is common in Ti(CN)–WC–Ni composite.
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