Abstract
Eight NbC solution matrix cermets were prepared by liquid phase sintering of mixtures containing NbC, WC, Ti(C0.7N0.3), Mo2C, Co and Ni powders. The influence of the WC and Ti(C0.7N0.3) content on the microstructure and mechanical properties of the cermets was investigated. Microstructural investigation was supported by thermodynamic equilibrium calculations to predict the composition of the constituent phases as a function of WC content at 1420 °C. The results indicated the variation in WC and Ti(C0.7N0.3) content had a significant influence on the phase content, the in-situ formed (Nb,W,Ti,Mo) (C,N) solution grain growth and concomitant mechanical properties. The NbC solution cermets with 12–32 wt% WC were composed of a core-rim (Nb,W,Ti,Mo) (C,N) phase, Co–Ni alloy binder, and rimless Ti(C0.57N0.43) phase. XRD phase analysis and simulations revealed that the composition of the cubic structure (Nb,W,Ti,Mo) (C,N) and Ti(C,N) solid solutions depend on the WC content. The NbC matrix cermets with 12–32 wt% WC exhibited a Vickers hardness (HV30) of ∼1500 kg/mm2 and indentation toughness of ∼9 MPa m1/2.
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