Microstructure and Properties of In-situ(Ti,Mo)C-Ni and(Ti,W,Mo)C-Ni Composite Synthesized by Reactive Hot-pressing
(Ti,Mo)C-Ni and(Ti,W,Mo)C-Ni composite were obtained by in-situ reactive hot pressing.The phase structure,microstructure and mechanical properties of the two composite were analyzed.The results show that the chemical reactions between Ti,C and Mo in(Ti,Mo)C-Ni composite are relatively complete.However,there is a small amount of unreacted C powder in(Ti,W,Mo)C-Ni composite,which is associated with the reaction between WC and Ti.The in-situ carbide grains are very fine with the size of 0.5～2 μm.With the addition of WC,the boundary morphology between the carbide grains and binder phase changes from angular shape into almost rounded shape.Additionally,the relative density increases as well as the hardness and bending strength.