Microstructure and Mechanical Properties of Ti_xV_1-xCN Based Cermets

Pre-alloyed TixV1-xCN solid-solution powders were synthesized by carbothermic method using ammonium metavanadate, titanium and graphite as raw materials, and then to prepare TixV1-xCN based cerments by adding Ni and Mo powders. The relationship between lattice parameter a and x of TixV1-xCN powders, as well as, phase, microstructure and mechanical properties of TixV1-xCN based cermets were investigated. Results show that parameter a had good relationship with x. The hard phase of TixV1-xCN based cermets had black core-grey shell structure. Large amounts of Mo in the form of MoC was solid dissolved with hard phase core, and Mo0.09Ni0.91 was formed by the solid solution of residual Mo with Ni. The Ti0.8V0.2CN based cermet had uniform microstructure and best mechanical properties, the hardness was 1 460 HV and the blending strength was 873 MPa.