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<p>Nitrogen gas pressure sintering was successfully employed to achieve the in-situ formation of Si<sub>3</sub>N<sub>4</sub>-bonded MgO–C refractories. The primary objective was to investigate the influence of different gas pressures on the mechanical properties and microstructure of MgO–C refractories. The results indicate that higher nitrogen pressure promotes the transformation of silicon nitride from the α phase to the β phase. This phase transition positively impacts the mechanical properties of Si<sub>3</sub>N<sub>4</sub>-bonded MgO–C refractories, leading to an enhancement in their overall strength. Notably, when the nitrogen pressure was set at 3&#xa0;MPa, exceptional compressive strength of 109.7&#xa0;MPa and an elastic modulus of 142.4 GPa were achieved by these prepared refractories. These findings highlight the great potential for utilizing gas pressure sintered Si<sub>3</sub>N<sub>4</sub>–MgO–C refractories.</p>

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Fabrication and mechanical properties of in-situ Si3N4 bonded MgO–C refractories by nitrogen gas pressure sintering

  • 期刊论文

  • 发表日期：

    2025年3月3日

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  • Xu Cheng,
  • Chao Yu,
  • Guang-chao Xing,
  • Bei-yue Ma,
  • Jun Ding,
  • Zhou-fu Wang,
  • Ji-xiang Zhang,
  • Hong-xi Zhu,
  • Cheng-ji Deng

摘要

Nitrogen gas pressure sintering was successfully employed to achieve the in-situ formation of Si3N4-bonded MgO–C refractories. The primary objective was to investigate the influence of different gas pressures on the mechanical properties and microstructure of MgO–C refractories. The results indicate that higher nitrogen pressure promotes the transformation of silicon nitride from the α phase to the β phase. This phase transition positively impacts the mechanical properties of Si3N4-bonded MgO–C refractories, leading to an enhancement in their overall strength. Notably, when the nitrogen pressure was set at 3 MPa, exceptional compressive strength of 109.7 MPa and an elastic modulus of 142.4 GPa were achieved by these prepared refractories. These findings highlight the great potential for utilizing gas pressure sintered Si3N4–MgO–C refractories.