Effect of Holding Time on Organization, Physical Phase and Corrosion Properties of Mo₂NiB₂ Cermet

Mo₂NiB₂ cermet were prepared using liquid-phase sintering technology, and the effects of different sintering temperature (1 280 ℃) holding times (insulation times) on the phase composition, microstructure, hardness, friction and wear properties, and corrosion resistance of Mo₂NiB₂ cermet were studied. The results show that Mo₂NiB₂ cermet were mainly composed of Mo₂NiB₂ phase, MoB phase, and MoNi phase. With the extension of insulation time, the amount of Mo₂NiB₂ phase generated first increased and then decreased. When the insulation time was 40 minutes, the hardness of the Mo₂NiB₂ cermet was the highest (2 784.9 HV_0.2), the friction and wear performance was the best, the corrosion resistance was the best, and the corrosion rate was 0.09 mm/a. However, when the insulation time was 10 minutes, the various properties of the sample deteriorated markedly.