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Removal of oxygen from titanium melt using hydrogen plasma arc: Challenge to 300 ppm

Research Project

Project/Area Number 18K18929
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 26:Materials engineering and related fields
Research InstitutionTohoku University

Principal Investigator

Narushima Takayuki  東北大学, 工学研究科, 教授 (20198394)

Co-Investigator(Kenkyū-buntansha) 上田 恭介  東北大学, 工学研究科, 准教授 (40507901)
Project Period (FY) 2018-06-29 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥6,240,000 (Direct Cost: ¥4,800,000、Indirect Cost: ¥1,440,000)
Fiscal Year 2019: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2018: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Keywordsチタン / プラズマ / 脱酸 / 溶解プロセス / 高純度化 / 低コスト化 / 水素 / 原子状水素 / 二段階法 / 熱力学 / 水蒸気
Outline of Final Research Achievements

The oxygen removal process from titanium melt, which was considered difficult in the past, has been established. The process consists of hydrogen plasma arc melting (first-step melting) and argon plasma arc melting (second-step melting). Oxygen removal from 0.127 mass% (1270 mass ppm) to 0.034 mass% (340 mass ppm) was achieved in the titanium melt by optimizing in melting conditions such as hydrogen partial pressure, melting time, gas flow rate and plasma current. Thermodynamic consideration suggested that the dissolved hydrogen introduced into titanium melt in response to the high hydrogen potential of active atomic hydrogen in plasma functions as a deoxidizer in the second-step melting. An international patent application was filed based on the results of this research.

Academic Significance and Societal Importance of the Research Achievements

学術的意義:これまで確立されていなかったチタン融体からの脱酸法として、水素プラズマアーク溶解を基礎としたプロセスを300 mass ppmまでの酸素除去という実証データおよび熱力学的考察とともに提案した。
社会的意義:還元プロセスはチタン部材製造コストの約1/3を占める。off gradeスポンジチタンやチタンスクラップなどの低廉原料の有効利用には、主要な不純物元素である酸素を除去するプロセス構築が必要であった。チタン融体から効率的に酸素除去するプロセスが構築されたことでチタン部材の低価格化に貢献するとともに、輸送機器や化学プラントへのチタンの適用を通して省エネルギーや地球温暖化抑制に貢献する。

Report

(3 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • Research Products

    (13 results)

All 2020 2019

All Journal Article (5 results) (of which Peer Reviewed: 4 results,  Open Access: 1 results) Presentation (7 results) (of which Int'l Joint Research: 2 results,  Invited: 3 results) Patent(Industrial Property Rights) (1 results) (of which Overseas: 1 results)

  • [Journal Article] 水素プラズマを利用したチタン融体からの酸素除去2020

    • Author(s)
      成島尚之, 上田恭介, 阿部来紀
    • Journal Title

      軽金属

      Volume: 70

    • Related Report
      2019 Annual Research Report
  • [Journal Article] Development of α+β-type biomedical Ti-Nb alloys with high oxygen content2020

    • Author(s)
      K. Ueda, M. Omiya, Y. Hirose and T. Narushima
    • Journal Title

      Proceedings of the 14th World Conference on Titanium (Ti-2019)

      Volume: -

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Recent activities of titanium research and development in Japan2020

    • Author(s)
      T. Narushima and Y. Sugizaki
    • Journal Title

      Proceedings of the 14th World Conference on Titanium (Ti-2019)

      Volume: -

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Deoxidation of Ti melt by newly developed two-step plasma arc melting process using hydrogen2019

    • Author(s)
      M. Watanabe, F. Sato, R. Abe, K. Ueda, D. Matsuwaka, F. Kudo and T. Narushima
    • Journal Title

      Metall. Mater. Trans. B

      Volume: 50 Issue: 4 Pages: 1553-1558

    • DOI

      10.1007/s11663-019-01608-x

    • Related Report
      2019 Annual Research Report 2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] Eect of Nonmetallic Inclusions on Fatigue Properties of Superelastic Ti-Ni Fine Wire2019

    • Author(s)
      F. Yamashita, Y, Ide, S. Kato, K. Ueda, T. Narushima, S. Kise, K. Ishikawa, M. Nishida
    • Journal Title

      Metals

      Volume: 9 Issue: 9 Pages: 999-999

    • DOI

      10.3390/met9090999

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] 材料工学における熱力学の役割2020

    • Author(s)
      成島尚之
    • Organizer
      学際・国際的高度人材育成ライフイノベーションマテリアル創製 共同研究プロジェクト 第7回生体医療・福祉材料分野研究会
    • Related Report
      2019 Annual Research Report
    • Invited
  • [Presentation] 水素プラズマアーク溶解を用いた溶融チタンの脱酸2020

    • Author(s)
      阿部来紀、渡辺将仁、上田恭介、松若大介、成島尚之
    • Organizer
      日本金属学会第166回大会(2020年春期)
    • Related Report
      2019 Annual Research Report
  • [Presentation] Recent Activities of Titanium Research and Development in Japan2019

    • Author(s)
      T. Narushima and Y. Sugizaki
    • Organizer
      The 14th World Conference of Titanium (Ti-2019)
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] α+β型Ti-5Nb合金の組織および機械的特性に及ぼす酸素濃度の影響2019

    • Author(s)
      廣瀬祐介、上田恭介、成島尚之
    • Organizer
      日本金属学会第165回大会(2019年秋期)
    • Related Report
      2019 Annual Research Report
  • [Presentation] 高酸素含有α+β型Ti-5Nb合金の組織と機械的特性2019

    • Author(s)
      上田恭介、廣瀬祐介、大宮正仁、成島尚之
    • Organizer
      軽金属学会第136回春期大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Development of α+β-type biomedical Ti-Nb alloys with high oxygen content2019

    • Author(s)
      K. Ueda, M. Omiya, Y. Hirose, T. Narushima
    • Organizer
      The 14th World Conference on Titanium (Ti-2019)
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 水素プラズマを利用したチタン融体からの酸素除去の可能性2019

    • Author(s)
      成島尚之
    • Organizer
      日本金属学会チタン製造プロセスと材料機能研究会第5回講演会
    • Related Report
      2018 Research-status Report
    • Invited
  • [Patent(Industrial Property Rights)] METHOD FOR PURIFYING TITANIUM MATERIAL2019

    • Inventor(s)
      MATSUWAKA D, NARUSHIMA T, UEDA K
    • Industrial Property Rights Holder
      KOBE STEEL, LTD.
    • Industrial Property Rights Type
      特許
    • Filing Date
      2019
    • Related Report
      2019 Annual Research Report
    • Overseas

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Published: 2018-07-25   Modified: 2021-02-19  

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