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<p>Fast hot-press sintering was employed to fabricate SiC-based composite ceramics reinforced by a single high-entropy boride (HEB) phase, specifically Ti₀.₂Zr₀.₂Hf₀.₂Nb₀.₂Ta₀.₂)B₂. The synergistic grain refinement between the SiC and HEB phases resulted in fine microstructures while preserving high hardness in the SiC-HEB composites. As the solid-state sintering temperature increases, the distribution of metal cations in the HEBs becomes more uniform, the relative density rises significantly, and the material’s fracture toughness enhances. The composites achieved a maximum hardness of 23.75 GPa at 1800&#xa0;°C and peak fracture toughness of 5.1 MPa·m<sup>1/2</sup> at 2000&#xa0;°C. Compared to previously reported SiC-HEB systems, these ceramics exhibit a superior balance of mechanical properties, making them promising candidates for high-temperature structural applications.</p>

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SiC-(Ti0.2Zr0.2Hf0.2Nb0.2Ta0.2)B2 composite ceramics prepared by fast hot-press sintering

  • 期刊论文

  • 发表日期：

    2025年3月11日

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  • Mantang Duan,
  • Iurii Bogomol

摘要

Fast hot-press sintering was employed to fabricate SiC-based composite ceramics reinforced by a single high-entropy boride (HEB) phase, specifically Ti₀.₂Zr₀.₂Hf₀.₂Nb₀.₂Ta₀.₂)B₂. The synergistic grain refinement between the SiC and HEB phases resulted in fine microstructures while preserving high hardness in the SiC-HEB composites. As the solid-state sintering temperature increases, the distribution of metal cations in the HEBs becomes more uniform, the relative density rises significantly, and the material’s fracture toughness enhances. The composites achieved a maximum hardness of 23.75 GPa at 1800 °C and peak fracture toughness of 5.1 MPa·m1/2 at 2000 °C. Compared to previously reported SiC-HEB systems, these ceramics exhibit a superior balance of mechanical properties, making them promising candidates for high-temperature structural applications.