Effect of Secondary Carbide Addition on Properties of Ti(C_(0.7)N_(0.3))-Ni Cermets

摘要

The effect of WC or NbC addition on various properties of Ti(C_(0.7)N_(0.3))-Ni cermets was investigated. The microstructure of Ti(C_(0.7)N_(0.3))-xWC-20Ni showed a typical core/rim structure, irrespective of the WC content, whereas the structure of Ti(C_(0.7)N_(0.3))-xNbC-20Ni was different and was dependent on the NbC content. The hardness (H_V) and the fracture toughness (K_(IC)) had a tendency to increase marginally, while the coercive force (H_C) and the magnetic saturation (4πσ) decreased gradually with an increase in WC or NbC content in the systems studied. In addition, increasing WC content in Ti(C_(0.7)N_(0.3))-xWC-20Ni system, decarburization was retarded, while denitrification was accelerated.