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<p>B<sub>4</sub>C–TiB<sub>2–</sub>SiC–graphite composites with high relative densities were fabricated by reactive hot pressing at 2000&#xa0;°C using B<sub>4</sub>C–TiC–SiC powder mixtures with various compositions. TiB<sub>2</sub> and graphite were in-situ synthesized during the reactive hot pressing of B<sub>4</sub>C–TiC–SiC powder mixtures. Lamellar graphite phases were synthesized at the B<sub>4</sub>C grain boundaries and B<sub>4</sub>C/TiB<sub>2</sub> interface. The grain size of B<sub>4</sub>C gradually decreased with increasing TiB<sub>2</sub>/graphite and SiC contents. With the increases in the TiB<sub>2</sub>/graphite and SiC contents in the B<sub>4</sub>C composites, the flexural strength was increased from 484.8 ± 14 to 597 ± 9&#xa0;MPa, while the fracture toughness was increased from 4.77 ± 0.24 to 6.82 ± 0.51&#xa0;MPa·m<sup>1/2</sup>. The Vickers hardness was preserved to some extent above 30 GPa regardless of the amounts of reinforced TiB<sub>2</sub>, SiC, and graphite in the B<sub>4</sub>C composites.</p>

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Mechanical properties of B4C–SiC–TiB2–graphite composites fabricated by reactive hot pressing using B4C–TiC–SiC powder mixture

  • 期刊论文

  • 发表日期：

    2026年4月24日

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  • Jun Hyung Park,
  • Dong Jun Kim,
  • Sung ll Yun,
  • Mi Rae Youm,
  • Seung Yong Lee,
  • Sahn Nahm,
  • Sang Whan Park

摘要

B4C–TiB2–SiC–graphite composites with high relative densities were fabricated by reactive hot pressing at 2000 °C using B4C–TiC–SiC powder mixtures with various compositions. TiB2 and graphite were in-situ synthesized during the reactive hot pressing of B4C–TiC–SiC powder mixtures. Lamellar graphite phases were synthesized at the B4C grain boundaries and B4C/TiB2 interface. The grain size of B4C gradually decreased with increasing TiB2/graphite and SiC contents. With the increases in the TiB2/graphite and SiC contents in the B4C composites, the flexural strength was increased from 484.8 ± 14 to 597 ± 9 MPa, while the fracture toughness was increased from 4.77 ± 0.24 to 6.82 ± 0.51 MPa·m1/2. The Vickers hardness was preserved to some extent above 30 GPa regardless of the amounts of reinforced TiB2, SiC, and graphite in the B4C composites.