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<p>The TC4 (Ti–6Al–4V) alloy is the most widely used titanium alloy worldwide. Owing to the strong affinity between titanium and oxygen, a large amount of waste TC4 alloy with high oxygen content is generated during the production and processing of TC4. At present, the industry has no effective method for removing oxygen from waste TC4, and waste titanium alloys are difficult to recycle, resulting in serious waste of resources. In this study, we propose a new method for the deoxidation of waste TC4, in which Mg and MgCl<sub>2</sub>–CeCl<sub>3</sub> are used as the deoxidizer and molten salt, respectively. First, thermodynamic calculations show that the formation of CeOCl ([O] (in TC4) + Mg (<i>l</i>) + CeCl<sub>3</sub> (<i>l</i>) = MgCl<sub>2</sub> (<i>l</i>) + CeOCl (<i>s</i>)) can effectively reduce the activity of MgO (a by-product of deoxidation) and promote the deep deoxidation of Mg, which can reduce the oxygen concentration in waste TC4 to 110 ppm. Then, experiments on the deoxidation of waste TC4 are conducted, and the effects of the molten salt composition and holding time on the deoxidation are investigated. The results show that the oxygen concentration in waste TC4 can be reduced from 3400 to 320 ppm when the holding time is 36&#xa0;hours and the molar fraction of CeCl<sub>3</sub> in the molten salt is 1. The tensile strength and elongation of TC4 are significantly improved after deoxidation treatment. Finally, a schematic of the deoxidation of waste TC4 used in industry is proposed based on the experimental results. The results of study are important for the sustainable development of TC4 and the entire titanium industry.</p>

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Efficient and Sustainable Deoxidation of Waste TC4 Alloy in MgCl2–CeCl3 Molten Salt

  • 期刊论文

  • 发表日期：

    2025年5月12日

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  • Jiarui Yang,
  • Liguo Zhu,
  • Lingxin Kong,
  • Zuqing Zhang,
  • Baoqiang Xu,
  • Bin Yang

摘要

The TC4 (Ti–6Al–4V) alloy is the most widely used titanium alloy worldwide. Owing to the strong affinity between titanium and oxygen, a large amount of waste TC4 alloy with high oxygen content is generated during the production and processing of TC4. At present, the industry has no effective method for removing oxygen from waste TC4, and waste titanium alloys are difficult to recycle, resulting in serious waste of resources. In this study, we propose a new method for the deoxidation of waste TC4, in which Mg and MgCl2–CeCl3 are used as the deoxidizer and molten salt, respectively. First, thermodynamic calculations show that the formation of CeOCl ([O] (in TC4) + Mg (l) + CeCl3 (l) = MgCl2 (l) + CeOCl (s)) can effectively reduce the activity of MgO (a by-product of deoxidation) and promote the deep deoxidation of Mg, which can reduce the oxygen concentration in waste TC4 to 110 ppm. Then, experiments on the deoxidation of waste TC4 are conducted, and the effects of the molten salt composition and holding time on the deoxidation are investigated. The results show that the oxygen concentration in waste TC4 can be reduced from 3400 to 320 ppm when the holding time is 36 hours and the molar fraction of CeCl3 in the molten salt is 1. The tensile strength and elongation of TC4 are significantly improved after deoxidation treatment. Finally, a schematic of the deoxidation of waste TC4 used in industry is proposed based on the experimental results. The results of study are important for the sustainable development of TC4 and the entire titanium industry.