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<p>Niobium is a critical and strategic element used in major industries like aerospace, defense, and electronics. In addition to primary extraction, it is necessary to recover niobium from secondary sources to meet its growing demand. In the present study, niobium coating recovery from type 440C tool steel substrate was studied using high-temperature oxidation process. The oxidation behavior of the bimetallic composite was evaluated in air atmosphere at 450–600&#xa0;°C. The post-oxidation steel substrate’s resistance to oxidation was assessed by investigating elemental maps, phases formed, and hardness tensile profiles. The post-oxidized characteristics of steel was investigated in order to assess its performance for extension of service life for intended application. In addition, the oxidation mechanism of metallic niobium and type 440C tool steel was also investigated separately using thermogravimetric analysis. The results demonstrated the viability of a&#xa0;high-temperature oxidation technique for recovery of niobium as niobium pentoxide, which is a value-added material.</p>

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Separation and Recovery of Niobium Coating from 440C Tool Steel by High-Temperature Oxidation

  • 期刊论文

  • 发表日期：

    2025年3月22日

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  • Akanksha Gupta,
  • Brajendra Mishra

摘要

Niobium is a critical and strategic element used in major industries like aerospace, defense, and electronics. In addition to primary extraction, it is necessary to recover niobium from secondary sources to meet its growing demand. In the present study, niobium coating recovery from type 440C tool steel substrate was studied using high-temperature oxidation process. The oxidation behavior of the bimetallic composite was evaluated in air atmosphere at 450–600 °C. The post-oxidation steel substrate’s resistance to oxidation was assessed by investigating elemental maps, phases formed, and hardness tensile profiles. The post-oxidized characteristics of steel was investigated in order to assess its performance for extension of service life for intended application. In addition, the oxidation mechanism of metallic niobium and type 440C tool steel was also investigated separately using thermogravimetric analysis. The results demonstrated the viability of a high-temperature oxidation technique for recovery of niobium as niobium pentoxide, which is a value-added material.