PREPARATION OF (TI_(0.8)MO_(0.2)C-NI CERMET BY MECHANICAL ALLOYING

摘要

The microstructural evolution of (Ti_(0.8)Mo_(0.2))C-30 mass%Ni powder by mechanical alloying of pure titanium, nickel, carbon and molybdenum as starting powder were investigated by both X-ray diffraction (XRD) using CuKα radiation and electron microscopy with energy-dispersive X-ray spectroscopy (EDS). The powders were mixed gradually and the size of the mechanically alloyed particles was submicrometer order. The peaks of the raw materials disappeared and the TiC peaks appeared after 500 hour milling time. These showed a trend toward higher angles, compared with the referenced TiC peaks. The particles consisted of nano ordered grains. The nickel might be transformed from crystallized phase into an amorphous phase by mechanical alloying. The sintered compact consisted of the spherical hard phase grains with coreless structure and nickel binder phase.