Development of high performance MgB2 wires by Mg diffusion method

• Project/Area Number: 21560764
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Material processing/treatments
• Research Institution: National Institute for Materials Science
• Principal Investigator: KUMAKURA Hiroaki 独立行政法人物質・材料研究機構, 強磁場ステーション, ステーション長 (90354307)
• Co-Investigator(Kenkyū-buntansha): MATSUMOTO Akiyoshi 独立行政法人物質・材料研究機構, 超伝導線材ユニット, 主幹研究員 (50354303) ; TOGANO Kazumasa 独立行政法人物質・材料研究機構, 超伝導線材ユニット, 研究業務員 (60361169)
• Project Period (FY): 2009 – 2011
• Project Status: Completed (Fiscal Year 2011)
• Budget Amount: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000); Fiscal Year 2011: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2010: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2009: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
• Keywords: 拡散法 / 塑性加工 / 充填率 / 空隙 / 多芯線材 / 臨界電流密度 / Mg添加 / 二硼化マグネシウム / 拡散反応 / 超伝導線材 / 機械加工

Research Abstract

We have fabricated single-to 37-filamentary MgB_2 wires applying an internal Mg diffusion process. The billet composed of Mg rod/B powder layer/metal sheath could be uniformly cold worked into wire with 1-1.5mm diameter at room temperature. During the heat treatment Mg at the center of filaments diffused to B layers and reacted with B to form MgB_2 layers. The packing density of this MgB_2 layer was much higher than that of conventional PIT processed MgB_2 wires. The optimum heat treatment temperature for 7-filamentary wire was 640℃, and critical current density J_c value reached to almost 1x10^3A/mm^2 at 4.2K and 10T and 1.3x10^3A/mm^2 in 3T at 20K. These J_c values are now the highest value among the MgB_2 wires. 19-and 37-filamentary wires showed somewhat lower J_c values than 7-filamentary wire due to less uniformity of reacted layers along the wire length.

Research Products

• [Journal Article] Mechanical properties of Mechanical properties of MgB_2 superconducting wires fabricated by internal Mg diffusion process (2012)
  • Author(s): G. Nishijima, S-J. Ye, A. Matsumoto, H. Kumakura, H. Kitaguchi and H. Oguro
  • Journal Title: Supercond. Sci. Technol Volume: 25
  • Peer Reviewed
• [Journal Article] Development of High Performance MgB2 Tapes and Wires (2012)
  • Author(s): KUMAKURA Hiroaki
  • Journal Title: JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN Volume: 81巻 1号 Issue: 1 Pages: 011010-011010
  • DOI: 10.1143/jpsj.81.011010
  • NAID: 210000109335
  • Peer Reviewed
• [Journal Article] Superconducting Properties of Diffusion-Processed Multifilamentary MgB2 Wires (2011)
  • Author(s): H. Kumakura, J. M. Hur, K. Togano, A. Matsumoto, H. Wada and K. Kimura
  • Journal Title: IEEE Trans. Appl. Supercond Volume: 21 Pages: 2643-2648
  • Peer Reviewed
• [Journal Article] Enhancement of the critical current density of internal Mg diffusion processed MgB2 wires by the addition of both SiC and liquid aromatic hydrocarbon (2011)
  • Author(s): S-J. Ye, A. Matsumoto, K. Togano and H. Kumakura
  • Journal Title: Physica C-Superconductivity and its applications Volume: 471 Pages: 1133-1136
  • Peer Reviewed
• [Journal Article] Microstructures and critical currents of single- and multi-filamentary MgB_2 superconducting wires fabricated by an internal Mg diffusion process (2011)
  • Author(s): K.Togano
  • Journal Title: Superconductor Science and Technology Volume: 23
  • Peer Reviewed
• [Journal Article] 拡散法による7芯MgB_2線材の作製とその超伝導特性 (2010)
  • Author(s): 熊倉浩明、許子萬、戸叶一正、松本明善、和田仁、木村薫
  • Journal Title: 日本金属学会誌 Volume: 第74巻 Pages: 439-443
  • NAID: 10026872582
  • Peer Reviewed
• [Journal Article] Microstructures and critical currents of single-and multi-filamentary MgB2 superconducting wires fabricated by an internal Mg diffusion process (2010)
  • Author(s): K. Togano, J. Hur, A. Matsumoto and H. Kumakura
  • Journal Title: Supercond. Sci. Technol Volume: 23
  • Peer Reviewed
• [Journal Article] 拡散法による7芯MgB_2線材の作製とその超伝導特性 (2010)
  • Author(s): 熊倉浩明
  • Journal Title: 日本金属学会誌 Volume: 74 Pages: 439-443
  • NAID: 10026872582
  • Peer Reviewed
• [Journal Article] MgB_2線材の現状と課題 (2010)
  • Author(s): 熊倉浩明
  • Journal Title: セラミックス(Bulletin of the Ceramic Society of Japan) Volume: 45 Pages: 902-906
  • NAID: 10027460675
  • Peer Reviewed
• [Presentation] 超伝導線材開発の現状と今後の展望 (2012)
  • Author(s): 熊倉浩明
  • Organizer: 技術セミナー「高温超伝導体の材料開発と実用化技術」
  • Place of Presentation: 大田区産業プラザ(東京都)(招待講演)
  • Year and Date: 2012-02-28
• [Presentation] Structure and properties of internal Mg diffusion processed MgB_2 wires (2012)
  • Author(s): H. Kumakura
  • Organizer: International Cryogenic Materials Conf
  • Place of Presentation: Fukuoka
• [Presentation] MgB_2線材におけるMgB_2コア充填率と臨界電流特性 (2012)
  • Author(s): 熊倉浩明
  • Organizer: 応用物理学会
  • Place of Presentation: 東京
• [Presentation] Structure and properties of Mg diffusion processed MgB2 multifilamentary wires (2012)
  • Author(s): KUMAKURA Hiroaki, YE Shujun, MATSUMOTO Akiyoshi, TOGANO Kazumasa, KIYOSHI Tsukasa
  • Organizer: ICEC24-ICMC2012
  • Place of Presentation: 福岡国際会議場(福岡県)
• [Presentation] MgB2材料、鉄系超伝導体 (2011)
  • Author(s): 熊倉浩明
  • Organizer: 応用物理学会スクール「100年の歴史に学ぶ超伝導」
  • Place of Presentation: 神奈川工大厚木キャンパス(神奈川県)(招待講演)
  • Year and Date: 2011-03-24
• [Presentation] Progress of MgB_2 wires and tapes (2011)
  • Author(s): H. Kumakura
  • Organizer: 24th International Symposium on Superconductivity
  • Place of Presentation: Tokyo
• [Presentation] Microstructure and critical current density of Internal Mg Diffusion (IMD) processed mono and multi-filamentary wires (2011)
  • Author(s): KUMAKURA Hiroaki, YE Shujun, MATSUMOTO Akiyoshi, TOGANO Kazumasa
  • Organizer: CEC-ICMC2011
  • Place of Presentation: Spoken Convenntion Center(米国)
• [Presentation] 未来の水素利用社会を支える低コスト高性能MgB2線材の開発 (2011)
  • Author(s): 熊倉浩明
  • Organizer: 東北・北海道支部第16回超電導・低温若手セミナー
  • Place of Presentation: 作並温泉ホテル一の坊(宮城県)(招待講演)
• [Presentation] Progress of MgB2 Wires and Tapes (2011)
  • Author(s): KUMAKURA Hiroaki
  • Organizer: 24th International Symposium on Superconductivity (ISS 2011)
  • Place of Presentation: タワーホール船堀(東京都)(招待講演)
• [Presentation] Development of Advanced Superconducting wires (2011)
  • Author(s): KUMAKURA Hiroaki
  • Organizer: 第11回チュニジア-日本文化・科学・技術学術会議(TJASSST' 11)
  • Place of Presentation: SAPHIR PALACE(チュニジア)(招待講演)
• [Presentation] 拡散法により作製したMgB2丸線材の組織と臨界電流特性 (2010)
  • Author(s): 熊倉浩明、許子萬、和田仁、松本明善、戸叶一正、木村薫
  • Organizer: 日本金属学会春期大会
  • Place of Presentation: 筑波大学
  • Year and Date: 2010-03-28
• [Presentation] Mg拡散法により作製したMgB_2線材の組織と超伝導特性 (2010)
  • Author(s): 熊倉浩明
  • Organizer: 低温工学・超電導学会
  • Place of Presentation: 鹿児島市
• [Presentation] Superconducting Properties of Diffusion-Processed Multifilamentary MgB_2 Wires (2010)
  • Author(s): H. Kumakura
  • Organizer: Applied Superconductivity Conf
  • Place of Presentation: Washington DC
• [Presentation] 内部Mg拡散(IMD)法によるMgB_2線材の作製-フィラメントサイズの組織・特性への影響- (2010)
  • Author(s): 戸叶一正
  • Organizer: 低温工学・超電導学会
  • Place of Presentation: 川崎市産業振興会館(神奈川県)
• [Presentation] Mg拡散法により作製したMgB_2線材の組織と超伝導特性 (2010)
  • Author(s): 熊倉浩明
  • Organizer: 低温工学・超電導学会
  • Place of Presentation: 鹿児島県民交流センター(鹿児島県)
• [Presentation] Superconducting Properties of Diffusion-Processed Multifilamentary MgB_2 Wires (2010)
  • Author(s): H.Kumakura
  • Organizer: Applied Superconductivity Conference 2010
  • Place of Presentation: Omni Shoreham Hotel, Washingtion, DC(米国)
• [Presentation] FABRICATION OF MgB_2 MULTI-FILAMENTARY WIRES BY INTERNAL Mg DIFFUSION PROCESS (2009)
  • Author(s): K.Togano, J.M.Hur, A.Matsumoto, H.Kumakura
  • Organizer: 22nd INTERNATIONAL SYMPOSIUM ON SUPERCONDUCTIVITY
  • Place of Presentation: EPOCHAL TSUKUBA
  • Year and Date: 2009-11-03