Abstract Ti(C,N)-based cermets were prepared by in situ carbothermal reduction of TiO2 and subsequent liquid phase sintering in one single process in vacuum. The densification behavior, phase transformation, and microstructure evolution of the cermets were investigated by DSC, XRD, SEM, and EDX. The results showed that the carbothermal reduction of TiO2 was completed below 1250 °C, and Ti(C,N)-based cermets with refined grains were obtained after sintered at 1400 °C for 1 h by this method. The hard phase of the cermets mainly exhibited white core/gray rim structure, in great contrast to the typical black core/gray rim structure of hard phase in traditional cermets. Ti(C,N)-based cermets prepared by this novel method showed excellent mechanical properties with a transverse rupture strength of 2516±55 MPa, a Rockwell hardness of 88.6±0.1 HRA, and a fracture toughness of 18.4±0.7 MPa m1/2, respectively.

中文翻译：

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TiO 2 原位碳热还原和液相烧结制备的Ti(C,N)基金属陶瓷的显微组织和力学性能

摘要 Ti(C,N)基金属陶瓷是通过TiO2的原位碳热还原和随后在真空中的单一过程中的液相烧结制备的。通过DSC、XRD、SEM和EDX研究了金属陶瓷的致密化行为、相变和微观结构演变。结果表明,TiO2在1250°C以下完成碳热还原,1400°C烧结1h后得到晶粒细化的Ti(C,N)基金属陶瓷。金属陶瓷的硬质相主要呈现白芯/灰边结构，​​与传统金属陶瓷中硬相典型的黑芯/灰边结构形成鲜明对比。通过这种新方法制备的 Ti(C,N) 基金属陶瓷表现出优异的机械性能，横向断裂强度为 2516±55 MPa，洛氏硬度为 88.6±0.1 HRA，