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<p>TiC-10Mo-20Ni cermets with outstanding comprehensive properties were fabricated using Ni powder, self-synthesized ultrafine TiC and Mo powders. The effects of different liquid-phase sintering temperatures (1450–1525&#xa0;°C) on the microstructure and mechanical properties of TiC-10Mo-20Ni cermets were investigated. The results demonstrated that all sintered samples exhibited a uniformly distributed core-rim structure. As the temperature increased, the degree of densification increased, and the number of gray coreless grains increased. The grain size of TiC-10Mo-20Ni cermets gradually increased with temperature, with the average grain size rising from 1.04 ± 0.29&#xa0;μm to 1.43 ± 0.55&#xa0;μm. The hardness of the sintered samples initially increased and then decreased with temperature, reaching a peak value of 1622 HV<sub>30</sub> at 1475&#xa0;°C. The fracture toughness (K<sub>IC</sub>) and transverse rupture strength (TRS) increased with temperature, and had the values of 15.02 MPa·m<sup>1/2</sup> and 1741&#xa0;MPa at 1525&#xa0;°C, respectively. The sintered samples were mainly dominated by a mixed fracture pattern of intergranular fracture and transgranular fracture, with transgranular fracture increasing as the temperature rose. Meanwhile, the crack extension and fracture morphology became more intricate, thus enhancing the K<sub>IC</sub> and TRS.</p>

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Microstructure and mechanical properties of TiC-10Mo-20Ni cermets

  • 期刊论文

  • 发表日期：

    2025年3月27日

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  • Xiao-Dong Kang,
  • Guo-Hua Zhang,
  • Kuo-Chih Chou

摘要

TiC-10Mo-20Ni cermets with outstanding comprehensive properties were fabricated using Ni powder, self-synthesized ultrafine TiC and Mo powders. The effects of different liquid-phase sintering temperatures (1450–1525 °C) on the microstructure and mechanical properties of TiC-10Mo-20Ni cermets were investigated. The results demonstrated that all sintered samples exhibited a uniformly distributed core-rim structure. As the temperature increased, the degree of densification increased, and the number of gray coreless grains increased. The grain size of TiC-10Mo-20Ni cermets gradually increased with temperature, with the average grain size rising from 1.04 ± 0.29 μm to 1.43 ± 0.55 μm. The hardness of the sintered samples initially increased and then decreased with temperature, reaching a peak value of 1622 HV30 at 1475 °C. The fracture toughness (KIC) and transverse rupture strength (TRS) increased with temperature, and had the values of 15.02 MPa·m1/2 and 1741 MPa at 1525 °C, respectively. The sintered samples were mainly dominated by a mixed fracture pattern of intergranular fracture and transgranular fracture, with transgranular fracture increasing as the temperature rose. Meanwhile, the crack extension and fracture morphology became more intricate, thus enhancing the KIC and TRS.