The application of TiN,up to now,is strongly limited to the coating material for various cutting tools and ornaments,while the synthesis of adequate bulk titanium nitride materials would be desirable for several applications to better meet different demands.In this paper,the TiN-WC-Ni-Co system cermets with nearly full density were successfully fabricated by conventional vacuum sintering with the addition of WC and were systematically investigated by scanning electron microscopy,X-ray diffraction and mechanical properties tests.Effect of WC addition on the microstructure and mechanical properties of TiN-based cermets was studied in this work.The results show that WC significantly helps to improve the wettability between TiN and Ni/Co through the formation of typical core-rim structure,which is rather beneficial to obtain the cermets with full densification and homogeneous microstructure.As the addition of WC content increases from 0 wt% to 25 wt%,the microstructure has an obvious trend to become denser and finer and the mechanical properties of the TiN-based cermets are enhanced greatly.When the WC content is 20 wt%,the relative density,transverse rupture strength,fracture toughness and Rockwell hardness of the cermets reach 99.5%,1235MPa,12.6 MPa m1/2 and 88.2,respectively.