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Fabrication, microstructure evolution, and mechanical properties of Ti(C,N)-HfN-WC-Ni-Mo cermets

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Abstract

Ti(C,N)-HfN-WC-Ni-Mo cermets were fabricated, and effects of HfN and WC content and sintering temperature on their microstructural evolution and mechanical properties were investigated. These cermets were primarily comprised of Ti(C0.41,N0.5), HfN, WC, TiC, Mo and Ni. At an additive concentration of 30 mol.%, the cermet exhibited the most homogeneous microstructure. The grain size gradually increased with increasing sintering temperature. The defects in the cermet sintered at 1500 ℃ significantly reduced, and the fine grains were homogeneously distributed. The fracture mode in cermets was a combination of transgranular fracture and intergranular fracture. Vickers hardness increased, flexural strength and fracture toughness first increased and then decreased with an increase of HfN and WC content. The cermet sintered at 1500 ℃ exhibited better mechanical properties: Vickers hardness was 22.29 GPa, flexural strength was 1271.58 MPa, and fracture toughness was 7.33 MPa·m1/2. In addition, the toughening mechanism of the Ti(C,N)-HfN-WC cermets mainly involved crack deflection and bridging.

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Acknowledgements

This work was supported by National Natural Science Foundation of China (Grant Nos. 52205492 and 51875388), Fundamental Research Program of Shanxi Province, China (Grant no. 202103021223121).

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Authors and Affiliations

  1. College of Mechanical and Vehicle Engineering, Taiyuan University of Technology, Taiyuan, 030024, China

    Jiabao Liu, Jinpeng Song, Weiqi Meng, Shiheng Hu & Yao Wang

  2. College of Aeronautics and Astronautics, Taiyuan University of Technology, Taiyuan, 030024, China

    Jiaojiao Gao

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  1. Jiabao Liu
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Correspondence to Jinpeng Song or Jiaojiao Gao.

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Liu, J., Song, J., Gao, J. et al. Fabrication, microstructure evolution, and mechanical properties of Ti(C,N)-HfN-WC-Ni-Mo cermets. J. Korean Ceram. Soc. (2024). https://doi.org/10.1007/s43207-024-00376-y

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