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<p>In this paper, smelted niobium ingots were prepared by vacuum aluminothermic reduction technology combined with electron beam melting technology. Thermodynamic properties, chemical compositions and microstructures of the products were analyzed. Vacuum aluminothermic smelting was accompanied by a significant decrease in Gibbs energy and a higher thermal effect. The reaction can spontaneously generate AlNb<sub>90</sub> alloy without the need for external heating. The recovery rate of niobium can exceed 99%. Meanwhile, AlNb<sub>90</sub> alloy included AlNb<sub>2</sub> and AlNb<sub>3</sub> phases, as well as inclusions such as Al<sub>2</sub>O<sub>3</sub>. Electron beam melting involved the degassing, decomposition, volatilization and deoxygenation processes of impurity elements. The microstructure of melted niobium ingots was pure and uniform, with only a small number of inclusions containing elements such as oxygen and carbon.</p>

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Study on the Preparation and Microstructure of Smelted Niobium Ingots

  • 期刊论文

  • 发表日期：

    2025年6月24日

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  • Dengkui Zhang,
  • Wei Wang,
  • Wentao Fan,
  • Jianmin Tang,
  • Jiaqi Zhu,
  • Junkai Piao,
  • Suhong Li,
  • Xin Sun,
  • Junbo Wang

摘要

In this paper, smelted niobium ingots were prepared by vacuum aluminothermic reduction technology combined with electron beam melting technology. Thermodynamic properties, chemical compositions and microstructures of the products were analyzed. Vacuum aluminothermic smelting was accompanied by a significant decrease in Gibbs energy and a higher thermal effect. The reaction can spontaneously generate AlNb90 alloy without the need for external heating. The recovery rate of niobium can exceed 99%. Meanwhile, AlNb90 alloy included AlNb2 and AlNb3 phases, as well as inclusions such as Al2O3. Electron beam melting involved the degassing, decomposition, volatilization and deoxygenation processes of impurity elements. The microstructure of melted niobium ingots was pure and uniform, with only a small number of inclusions containing elements such as oxygen and carbon.