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<p>Binder phase design is key to improving the toughness and crack resistance of Ti(C,N)-based cermets. In this work, we developed a novel high-entropy alloy binder (FeCoNi(MoW)<sub>0.2</sub>) to explore the role of the refractory elements W and Mo in enhancing fracture toughness and suppressing crack propagation in (Ti,W,Mo,Nb,Ta)(C,N)-based systems. The ceramic and binder phases were mixed by ball milling and sintered at 1450 °C for 1&#xa0;h. The resulting cermets had a relative density of 97.3%, a hardness of 1862.12 HV<sub>30</sub>, a flexural strength of 1320&#xa0;MPa, and a fracture toughness of 11.97&#xa0;MPa·m<sup>1/2</sup>. Microstructural analysis revealed that W and Mo reacted in situ with residual carbon to form (W,Mo)C carbides, which promoted crack deflection and bridging, effectively absorbing crack propagation energy and enhancing toughness. However, excessive binder content led to enrichment of W and Mo, which impeded densification. Under these conditions, although fracture toughness further increased to 14.22&#xa0;MPa·m<sup>1/2</sup>, hardness and flexural strength declined. This study offers new insights into binder composition design and optimization for high-toughness Ti(C,N)-based cermets.</p>

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Investigation of the Toughening Mechanism of High-Entropy Carbonitride Ceramics with FeCoNi(MoW)0.2 Binder Phase

  • 期刊论文

  • 发表日期：

    2026年2月22日

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  • Haoyu Cai,
  • Houan Zhang,
  • Zhongyou Que,
  • Peng Xia,
  • Jiqiong Lian,
  • Yuanfei Lan

摘要

Binder phase design is key to improving the toughness and crack resistance of Ti(C,N)-based cermets. In this work, we developed a novel high-entropy alloy binder (FeCoNi(MoW)0.2) to explore the role of the refractory elements W and Mo in enhancing fracture toughness and suppressing crack propagation in (Ti,W,Mo,Nb,Ta)(C,N)-based systems. The ceramic and binder phases were mixed by ball milling and sintered at 1450 °C for 1 h. The resulting cermets had a relative density of 97.3%, a hardness of 1862.12 HV30, a flexural strength of 1320 MPa, and a fracture toughness of 11.97 MPa·m1/2. Microstructural analysis revealed that W and Mo reacted in situ with residual carbon to form (W,Mo)C carbides, which promoted crack deflection and bridging, effectively absorbing crack propagation energy and enhancing toughness. However, excessive binder content led to enrichment of W and Mo, which impeded densification. Under these conditions, although fracture toughness further increased to 14.22 MPa·m1/2, hardness and flexural strength declined. This study offers new insights into binder composition design and optimization for high-toughness Ti(C,N)-based cermets.