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<p>MgO ceramics with high density and superior properties were prepared from MgO powder using MgF₂ and Al₂O₃ as sintering aids via gelcasting and pressureless sintering. XRD, SEM and EDS were used to analyze the samples. The addition of MgF₂ and Al₂O₃ (with a ratio of Al₂O₃:MgF ₂ = 2–8:4) has been shown to enhance the densification and properties of MgO ceramics. This beneficial liquid phase may be attributed to the synergistic effects of liquid-phase sintering and spinelization reactions, which wet grain boundaries, promote particle rearrangement and mass transport, fill intergranular pores, and accelerate densification. At 1550&#xa0;°C with an Al₂O₃:MgF ₂ ratio of 6:4, the MgO ceramics achieved optimal values for bulk density (3.331&#xa0;g/cm<sup>3</sup>), thermal conductivity (39.2W/(m·K)), and flexural strength (63.15&#xa0;MPa).</p>

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Preparation of MgO ceramics by low temperature sintering with MgF2 and Al2O3 as sintering additives

  • 期刊论文

  • 发表日期：

    2025年3月12日

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  • Yicheng Xiao,
  • Deqing Cheng,
  • Guang Li,
  • Ruiming Yin,
  • Pengfei Li,
  • Zhen Gao

摘要

MgO ceramics with high density and superior properties were prepared from MgO powder using MgF₂ and Al₂O₃ as sintering aids via gelcasting and pressureless sintering. XRD, SEM and EDS were used to analyze the samples. The addition of MgF₂ and Al₂O₃ (with a ratio of Al₂O₃:MgF ₂ = 2–8:4) has been shown to enhance the densification and properties of MgO ceramics. This beneficial liquid phase may be attributed to the synergistic effects of liquid-phase sintering and spinelization reactions, which wet grain boundaries, promote particle rearrangement and mass transport, fill intergranular pores, and accelerate densification. At 1550 °C with an Al₂O₃:MgF ₂ ratio of 6:4, the MgO ceramics achieved optimal values for bulk density (3.331 g/cm3), thermal conductivity (39.2W/(m·K)), and flexural strength (63.15 MPa).