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<p>Using a composite layered carbon electrode structure, this study achieved room<b>-</b>temperature flash sintering of disc-shaped SiC ceramics without sintering aids. Under a DC voltage of 100&#xa0;V, the developed method enabled the preparation of sintered SiC discs (20&#xa0;mm diameter) in 180&#xa0;s with a relative density of 94.13%. Despite exhibiting a larger grain size relative to conventionally sintered counterparts, the flash-sintered samples developed well-defined grain boundaries. These samples demonstrated enhanced electrical performance, including a voltage gradient of 94.4&#xa0;V/mm and a nonlinear coefficient of 2.0, along with improved mechanical properties such as a Vickers hardness of 0.674 GPa and a fracture toughness of 1.403 MPa·m<sup>0.5</sup> compared to conventionally sintered counterparts. Not only did flash sintering reduce the sintering time from several hours to minutes, significantly lowering energy consumption and equipment requirements, but it also achieved a dense microstructure and robust macroscopic properties. Moreover, the sintering device and method employed in this study overcame the limitations of existing flash sintering techniques regarding the shape of SiC ceramic green bodies, providing a viable strategy for preparing high-performance non-oxide ceramics with adaptable geometries under energy-efficient conditions.</p>

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Room-temperature flash sintering of silicon carbide ceramics via novel carbon electrodes

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年8月5日

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  • Fangji Liu,
  • Guilai Yin,
  • Junwei Wang,
  • Zhuo Liu,
  • Nianping Yan,
  • Rongxia Huang,
  • Xilin Wang

摘要

Using a composite layered carbon electrode structure, this study achieved room-temperature flash sintering of disc-shaped SiC ceramics without sintering aids. Under a DC voltage of 100 V, the developed method enabled the preparation of sintered SiC discs (20 mm diameter) in 180 s with a relative density of 94.13%. Despite exhibiting a larger grain size relative to conventionally sintered counterparts, the flash-sintered samples developed well-defined grain boundaries. These samples demonstrated enhanced electrical performance, including a voltage gradient of 94.4 V/mm and a nonlinear coefficient of 2.0, along with improved mechanical properties such as a Vickers hardness of 0.674 GPa and a fracture toughness of 1.403 MPa·m0.5 compared to conventionally sintered counterparts. Not only did flash sintering reduce the sintering time from several hours to minutes, significantly lowering energy consumption and equipment requirements, but it also achieved a dense microstructure and robust macroscopic properties. Moreover, the sintering device and method employed in this study overcame the limitations of existing flash sintering techniques regarding the shape of SiC ceramic green bodies, providing a viable strategy for preparing high-performance non-oxide ceramics with adaptable geometries under energy-efficient conditions.