NbC-Ni based cermets: Phase diagrams, microstructure and mechanical properties
Source abstract
Abstract
The multi-component phase diagrams, microstructure and correlated mechanical properties of recently developed NbC-Ni based cermets are described, allowing to elucidate the correlations between composition, microstructure and mechanical properties, and address some potential applications. The influence of the carbon content, binder content, and secondary carbide additions on the microstructure and mechanical properties of NbC-based cermets are presented in detail. The reported materials focus on NbC-Ni matrix grades with 6–20 wt% Ni binder and 4–20 wt% (VC, Mo 2C, WC, TiC, and/or Ti(C xN y)) additions densified by liquid phase sintering in vacuum. The results revealed that the NbC grain growth was significantly limited by some combinations of carbide or carbonitride additions, strongly influencing the mechanical properties. The NbC-based cermets offer mechanical properties that would allow them to partially replace WC-Co and Ti(C,N)-Ni in some specific wear resistant applications.
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