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Morphology Evolution and Phase Interactions of Fe-containing Si_3N_4 in Vacuum High-temperature Environment

机译：真空高温环境中含铁Si_3N_4的形貌演化和相间相互作用

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摘要

To study the substitution of Fe_3Si-Si_3N_4 for refractories in the upper RH refiner, this paper simulated the service condition of_RH refining and studied the change of the Fe_3Si-Si_3N_4 in the simulated condition. A Fe_3Si-Si_3N_4 specimen prepared by flash combustion was put in a vacuum sintering furnace with carbon lining, fired at 1 450℃ under 80 Pa of vacuum degree for 2 h, and then cooled. The morphological evolution before and after being treated and phase interactions of the Fe_3Si-Si_3N_4 specimen were studied and analyzed thermodynamically and dynamically. The results show that at high temperatures in vacuum, Fe volatilizes from the Fe_3Si melt in Fe_3Si-Si_3N_4 and reacts with Si_3N_4 on the Si_3N_4 crystal surface, forming new Fe_xSi melt there; then Fe continues to volatilize from the new Fe_xSi melt, causing Fe_xSi alloy particles finer and more uniform in Fe_3Si-Si_3N_4; the hexagonal columnar Si_3N_4 crystals begin to decompose partially, and become cylindrical with edges and corners disappearing; during prebaking or operation interval of RH refining, a SiO_2 film which has better stability than Si_3N_4 is developed on the surface of Si_3N_4 crystals or Fe_3Si-Si_3N_4 bricks, preventing the decomposition of Si_3N_4 and improving the application feasibility of Fe_3Si-Si_3N_4 in RH refining.
机译：为了研究上部RH精炼机中Fe_3Si-Si_3N_4替代耐火材料，模拟了_RH精炼的使用条件，并研究了在模拟条件下Fe_3Si-Si_3N_4的变化。将通过闪速燃烧制备的Fe_3Si-Si_3N_4样品放入带碳衬里的真空烧结炉中，在1450℃，80 Pa的真空度下烧结2 h，然后冷却。对Fe_3Si-Si_3N_4试样的处理前后的形态演变以及相间相互作用进行了热力学和动态分析。结果表明，在真空中高温下，Fe从Fe_3Si-Si_3N_4中的Fe_3Si熔体中挥发出来，并与Si_3N_4晶体表面上的Si_3N_4反应，在此处形成新的Fe_xSi熔体。然后，Fe继续从新的Fe_xSi熔体中挥发出来，使Fe_xSi合金颗粒在Fe_3Si-Si_3N_4中更细，更均匀。六方柱状Si_3N_4晶体开始部分分解，并变为具有棱角消失的圆柱状。在预烘烤或RH精炼操作间隔期间，在Si_3N_4晶体或Fe_3Si-Si_3N_4砖的表面上形成了比Si_3N_4具有更好稳定性的SiO_2膜，从而防止了Si_3N_4的分解，提高了Fe_3Si-Si_3N_4在RH精炼中的应用可行性。

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  • 来源
    《ISIJ international》 |2016年第2期|189-194|共6页
  • 作者

    Bin LI; Junhong CHEN; Mingwei YAN; Jindong SU; Jialin SUN; Yong LI;

  • 作者单位

    School of Materials Science and Engineering, University of Science and Technology Beijing, Xueyuan Road 30#, Haidian District, Beijing, Beijing, 100083 China;

    School of Materials Science and Engineering, University of Science and Technology Beijing, Xueyuan Road 30#, Haidian District, Beijing, Beijing, 100083 China;

    School of Materials Science and Engineering, University of Science and Technology Beijing, Xueyuan Road 30#, Haidian District, Beijing, Beijing, 100083 China;

    School of Materials Science and Engineering, University of Science and Technology Beijing, Xueyuan Road 30#, Haidian District, Beijing, Beijing, 100083 China;

    School of Materials Science and Engineering, University of Science and Technology Beijing, Xueyuan Road 30#, Haidian District, Beijing, Beijing, 100083 China;

    School of Materials Science and Engineering, University of Science and Technology Beijing, Xueyuan Road 30#, Haidian District, Beijing, Beijing, 100083 China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    RH refining; refractories; Fe_3Si-Si_3N_4; morphology;

    机译：RH精炼;耐火材料Fe_3Si-Si_3N_4;形态学;

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