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<p>Ferrosilicon nitride (Fe-Si<sub>3</sub>N<sub>4</sub>) is a promising additive for enhancing the performance of carbon (C)-containing refractories due to the exceptional high-temperature properties of Si<sub>3</sub>N<sub>4</sub> and the enhanced sintering characteristics of the iron (Fe) phase. This study examined the effects of the atmosphere and Fe phase on the Si<sub>3</sub>N<sub>4</sub>-C system to elucidate the reaction behavior and mechanisms of Fe-Si<sub>3</sub>N<sub>4</sub> in C-containing materials at elevated temperatures. Phase composition, microstructure, and elemental distribution were analyzed, alongside theoretical thermodynamic calculations. The results indicated that the presence of the Fe phase reduced the complete conversion temperature of Si<sub>3</sub>N<sub>4</sub> to silicon carbide (SiC) from 1600 °C to 1500 °C. This suggested that the Fe phase significantly accelerated the conversion rate and lowered the conversion temperature. This effect was attributable to the formation of an Fe-Si–C melt, wherein [Fe] decomposed Si<sub>3</sub>N<sub>4</sub>, absorbing [Si] to form a high-Si mesophase. Subsequently, [Si] reacted with C to form SiC. Additionally, in a reducing atmosphere, the final stable products of the Fe- Si<sub>3</sub>N<sub>4</sub>-C system were SiC and FeSi<sub>3</sub>. However, the presence of CO led to slight oxidization of Si<sub>3</sub>N<sub>4</sub> compared with its behavior in an argon atmosphere.</p>

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Effect of atmosphere and iron phase on the silicon nitride-carbon system

  • 期刊论文

  • 发表日期：

    2025年4月14日

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  • Qi Zheng,
  • Zhaoyang Liu,
  • Tianpeng Wen,
  • Lei Yuan,
  • Jingkun Yu

摘要

Ferrosilicon nitride (Fe-Si3N4) is a promising additive for enhancing the performance of carbon (C)-containing refractories due to the exceptional high-temperature properties of Si3N4 and the enhanced sintering characteristics of the iron (Fe) phase. This study examined the effects of the atmosphere and Fe phase on the Si3N4-C system to elucidate the reaction behavior and mechanisms of Fe-Si3N4 in C-containing materials at elevated temperatures. Phase composition, microstructure, and elemental distribution were analyzed, alongside theoretical thermodynamic calculations. The results indicated that the presence of the Fe phase reduced the complete conversion temperature of Si3N4 to silicon carbide (SiC) from 1600 °C to 1500 °C. This suggested that the Fe phase significantly accelerated the conversion rate and lowered the conversion temperature. This effect was attributable to the formation of an Fe-Si–C melt, wherein [Fe] decomposed Si3N4, absorbing [Si] to form a high-Si mesophase. Subsequently, [Si] reacted with C to form SiC. Additionally, in a reducing atmosphere, the final stable products of the Fe- Si3N4-C system were SiC and FeSi3. However, the presence of CO led to slight oxidization of Si3N4 compared with its behavior in an argon atmosphere.