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<p>AlN@Ni powder, prepared by electroless plating, was used as an additive to fabricate Ti(C,N)-based cermets by vacuum pressureless sintering at 1600&#xa0;°C. The introduction of AlN@Ni promoted solid-solution formation and in situ generation of (Co,Ni)<sub>3</sub>Al in the binder phase. The phase composition, microstructure, mechanical properties and tribological properties of the cermets were investigated. It was found that the addition of AlN@Ni significantly refined the grain size. When AlN@Ni content exceeded 3&#xa0;wt%, (Co,Ni)<sub>3</sub>Al was in situ generated in the binder phase. The combined effects of fine grain strengthening and dispersion strengthening mechanisms led to optimal mechanical properties of the cermets with (Co,Ni)<sub>3</sub>Al. The Vickers’ hardness, flexural strength and fracture toughness were 1608.1&#xa0;MPa, 1565.8&#xa0;MPa, and 9.3&#xa0;MPa&#xa0;m<sup>1/2</sup>, respectively. The hardness and flexural strength increased by 21.4% and 40% compared to cermets without AlN@Ni. Moreover, the introduction of AlN@Ni and generation of (Co,Ni)<sub>3</sub>Al significantly improved the high-temperature wear resistance of the cermets, and the high-temperature volume wear rate was comparable to that at room temperature.</p>

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Microstructure, mechanical, and tribological properties of Ti(C,N)-based cermets with in situ (Co,Ni)3Al

  • 期刊论文

  • 发表日期：

    2026年5月30日

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  • Jiaying Feng,
  • Qian Liu,
  • Meiling Liu,
  • Wanxiu Hai,
  • Yuhong Chen

摘要

AlN@Ni powder, prepared by electroless plating, was used as an additive to fabricate Ti(C,N)-based cermets by vacuum pressureless sintering at 1600 °C. The introduction of AlN@Ni promoted solid-solution formation and in situ generation of (Co,Ni)3Al in the binder phase. The phase composition, microstructure, mechanical properties and tribological properties of the cermets were investigated. It was found that the addition of AlN@Ni significantly refined the grain size. When AlN@Ni content exceeded 3 wt%, (Co,Ni)3Al was in situ generated in the binder phase. The combined effects of fine grain strengthening and dispersion strengthening mechanisms led to optimal mechanical properties of the cermets with (Co,Ni)3Al. The Vickers’ hardness, flexural strength and fracture toughness were 1608.1 MPa, 1565.8 MPa, and 9.3 MPa m1/2, respectively. The hardness and flexural strength increased by 21.4% and 40% compared to cermets without AlN@Ni. Moreover, the introduction of AlN@Ni and generation of (Co,Ni)3Al significantly improved the high-temperature wear resistance of the cermets, and the high-temperature volume wear rate was comparable to that at room temperature.