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<p>MgF<sub>2</sub>/Al<sub>2</sub>O<sub>3</sub> composite sintering aids and ZrO<sub>2</sub> reinforcing phases were employed to enhance the mechanical properties of Si<sub>3</sub>N<sub>4</sub> ceramics. Si<sub>3</sub>N<sub>4</sub> ceramics were synthesized via pressureless sintering at 1 620–1 640 °C for 3 hours. This study comprehensively investigated the impact of the composite sintering aids and the sintering temperature on the mechanical properties, phase transformation and microstructure. The Si<sub>3</sub>N<sub>4</sub> ceramics with an optimized <i>α/β</i> phase proportion exhibit a good performance in hardness and strength. These ceramics were sintered at 1 630 °C. The density, hardness and bending strength are 93.30%, 16.64 (± 0.38) GPa, and 441.26 (± 34.46) MPa.</p>

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Effect of Al2O3 Addition on the Hardness of Si3N4 Ceramics

  • 期刊论文

  • 发表日期：

    2026年7月9日

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  • Jian Tan,
  • Bing Cai,
  • Cong Wu,
  • Liangying Tang,
  • Ting Huang,
  • Jing Ye,
  • Huachen Liu,
  • Chengzhuo Li

摘要

MgF2/Al2O3 composite sintering aids and ZrO2 reinforcing phases were employed to enhance the mechanical properties of Si3N4 ceramics. Si3N4 ceramics were synthesized via pressureless sintering at 1 620–1 640 °C for 3 hours. This study comprehensively investigated the impact of the composite sintering aids and the sintering temperature on the mechanical properties, phase transformation and microstructure. The Si3N4 ceramics with an optimized α/β phase proportion exhibit a good performance in hardness and strength. These ceramics were sintered at 1 630 °C. The density, hardness and bending strength are 93.30%, 16.64 (± 0.38) GPa, and 441.26 (± 34.46) MPa.