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<p>Effects of oxide agents, CoO, Cr<sub>2</sub>O<sub>3</sub>, and CaO on desiliconization during vacuum induction melting of Ni-base superalloys were compared. Elemental analyses revealed that all desiliconization agents decreased the Si concentration in the alloy, with CoO exhibiting the highest desiliconization efficiency. Meanwhile, element mapping results suggest that, desiliconization is attributed to redox reactions for CoO and Cr<sub>2</sub>O<sub>3</sub>, whereas the formation of calcium aluminates likely contributed to the desiliconization of the alloy for CaO.</p>

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Desiliconization of a Molten Ni-Base Superalloy Using Refining Agents

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月5日

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  • Masaki Dobashi,
  • Chihiro Tabata,
  • Satoshi Utada,
  • Toshio Osada,
  • Kyoko Kawagishi,
  • Shinsuke Suzuki

摘要

Effects of oxide agents, CoO, Cr2O3, and CaO on desiliconization during vacuum induction melting of Ni-base superalloys were compared. Elemental analyses revealed that all desiliconization agents decreased the Si concentration in the alloy, with CoO exhibiting the highest desiliconization efficiency. Meanwhile, element mapping results suggest that, desiliconization is attributed to redox reactions for CoO and Cr2O3, whereas the formation of calcium aluminates likely contributed to the desiliconization of the alloy for CaO.