Abstract
A Ti(C, N)-based cermet cutting tool material with satisfactory properties was fabricated in an energy-efficient way by microwave sintering. The effect of microwave singtering process and the component ratio of carbide (WC, Mo2C) on phase composition, microstructure and mechanical properties were studied. The cermet containing 5wt% WC and 15wt% Mo2C microwave sintered at 1400℃ for 10min, got the optimal mechanical properties. The relative density, fracture toughness and Vicker's hardness were 97.2 ± 0.5%, 8.24 ± 0.49MPam1/2 and 17.54 ± 0.66GPa, respectively. The microwave sintering temperature and holding time decreased by 1.4~15.25% and 66.7~96.1% in comparison with conventional sintering. Solid solution (Ti, Mo)C2 and (W, Ti)C without nitrogen formed, which was different from the carbonitride solid solution that formed in conventional sintering. Additionally, long holding time brought about the formation of whisker-like materials, which benefited the fracture toughness.
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