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<p>B<sub>4</sub>C-TiB<sub>2</sub>-SiC-CNTs ceramic composites with different carbon nanotube (CNT) contents ranging from 0 to 8 wt.% were fabricated by hot-press sintering. The effects of CNTs on the densification behavior, microstructure, and mechanical properties were systematically investigated. Results indicate that the addition of CNTs promotes the densification process of the B<sub>4</sub>C-TiB<sub>2</sub>-SiC-CNTs ceramic composites, leading to a significant improvement in both density and mechanical properties. Under the sintering conditions of 2100&#xa0;°C and 30&#xa0;MPa, the ceramic with 4 wt.% CNTs achieved a relative density of 97.3%, Vickers hardness of 29.7 GPa, flexural strength of 494.5&#xa0;MPa, and fracture toughness of 6.1&#xa0;MPa·m<sup>1/2</sup>. Compared with the CNT-free sample, the flexural strength and fracture toughness were increased by 62% and 64%, respectively. The toughness was primarily attributed to crack deflection, branching, and bridging, with the failure mode being a mixture of intergranular and transgranular fracture.</p>

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Microstructure and Mechanical Properties of CNT-Reinforced B4C-TiB2-SiC Ceramic Composites

  • 期刊论文

  • 发表日期：

    2026年7月6日

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  • Huifeng Yan,
  • Guozhang Zhao,
  • Daimiao Wei,
  • Shichao Huang,
  • Rui Qiu,
  • Jifang Fu,
  • Hongtao Wang

摘要

B4C-TiB2-SiC-CNTs ceramic composites with different carbon nanotube (CNT) contents ranging from 0 to 8 wt.% were fabricated by hot-press sintering. The effects of CNTs on the densification behavior, microstructure, and mechanical properties were systematically investigated. Results indicate that the addition of CNTs promotes the densification process of the B4C-TiB2-SiC-CNTs ceramic composites, leading to a significant improvement in both density and mechanical properties. Under the sintering conditions of 2100 °C and 30 MPa, the ceramic with 4 wt.% CNTs achieved a relative density of 97.3%, Vickers hardness of 29.7 GPa, flexural strength of 494.5 MPa, and fracture toughness of 6.1 MPa·m1/2. Compared with the CNT-free sample, the flexural strength and fracture toughness were increased by 62% and 64%, respectively. The toughness was primarily attributed to crack deflection, branching, and bridging, with the failure mode being a mixture of intergranular and transgranular fracture.