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Development of advanced MgB_2 superconducting tapes by controlling microstructure

Research Project

Project/Area Number 18560323
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Electronic materials/Electric materials
Research InstitutionNational Institute for Materials Science

Principal Investigator

HIROKI Fujii  National Institute for Materials Science, SMC, Senior Researcher (80354306)

Co-Investigator(Kenkyū-buntansha) OZAWA Kiyoshi  National Institute for Materials Science, PMC, Senior Researcher (90343855)
Project Period (FY) 2006 – 2007
Project Status Completed (Fiscal Year 2007)
Budget Amount *help
¥3,680,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥180,000)
Fiscal Year 2007: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2006: ¥2,900,000 (Direct Cost: ¥2,900,000)
Keywordsmagnesium diboride / chemical solution process / grain pulverization / critical current density / carbon substitution / 微結晶 / 炭疽置換
Research Abstract

We have improved critical current density (Jc) of MgB_2 superconducting tapes by the refinement of MgB_2 powder Ex-situ processed tapes using commercially available MgB_2 powders soaked in organic acid solutions show the improvement in transport Jc. This improvement is attributed to the grain pulverization and carbon substitution. The former is probably associated with the dissolution of MgO layers attaching to the MgB_2 grains. On the other hand, the latter originates from the remnant organic solvent adsorbing to the surface of MgB_2. The grain refinement increases the area of grain boundaries that acts as pinning centers. The carbon substitution increases upper critical field (Bc_2) Therefore, these effects successfully improve the Jc values of the tapes. The Jc values at 4.2 K and 10 T reach 4kA/cm^2 by the chemical treatment. This value corresponds to the tenfold increase, compared with the values of tapes using pristine MgB2 powders without treatment.
This process is easy and low-cost which is suitable for the fabrication of long wires and tapes. Furthermore, this is applicable to other processes, such as ball-milled powders, and further improvement in Jc can expected.

Report

(3 results)
  • 2007 Annual Research Report   Final Research Report Summary
  • 2006 Annual Research Report
  • Research Products

    (28 results)

All 2008 2007 2006

All Journal Article (12 results) (of which Peer Reviewed: 8 results) Presentation (16 results)

  • [Journal Article] "Effects of both addition and chemical treatment of SiC nanoparticles on the grain coupling and the critical current density in ex-situ processed MgB_2 tapes"2008

    • Author(s)
      H.Fujii,K.Togano and K.Ozawa
    • Journal Title

      Supercond.Sci.Technol. 21

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
    • Peer Reviewed
  • [Journal Article] "Improved critical current densities in MgB_2 tapes fabricated through an ex-situ process using powders treated in various chemical solutions"2008

    • Author(s)
      H.Fujii,K.Togano and K.Ozawa
    • Journal Title

      J.Mater.Res. 23

      Pages: 507-514

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
    • Peer Reviewed
  • [Journal Article] Effects of both addition and chemical treatment of SiC nanoparticles on the grain coupling and the critical current density in ex-situ processed MgB2 tapes2008

    • Author(s)
      H. Fujii, K. Togano, K. Ozawa
    • Journal Title

      Supercond. Sci. Technol 21

      Pages: 15002-15002

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] Improved critical current densities in MgB2 tapes fabricated through an ex-situ process using powders treated in various chemical soutions2008

    • Author(s)
      H. Fujii, K. Togano, K. Ozawa
    • Journal Title

      J. Mater. Res 23

      Pages: 507-514

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] "lmproved critical current densities in MgB_2 tapes fabricated through an ex-situ process using powders treated in variolls chemical solutions"2008

    • Author(s)
      H. Fujii
    • Journal Title

      Journal of Materials Research 23

      Pages: 507-514

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] "Effects of both addition and chemical treatment of SiC nanoparticles on the grain coupling and the critical current current density in ex-situ processed MgB_2 tapes"2008

    • Author(s)
      H. Fujii
    • Journal Title

      Superconductor Science and Technology 21

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] "Improved critical current densities in ex-situ processed MgB_2 tapes fabricated with chemically treated powder"2007

    • Author(s)
      H.Fujii,K.Togano and K.Ozawa
    • Journal Title

      J.Mater.Res. 22

      Pages: 1281-1285

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
    • Peer Reviewed
  • [Journal Article] "Effect of SiC addition on the superconducting properties of MgB_2 tapes fabricated through an ex-situ process using chemically treated powder"2007

    • Author(s)
      H.Fujii,K.Togano,H.Kumakura and K.Ozawa
    • Journal Title

      Supercond.Sci.Technol. 20

      Pages: 579-583

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
    • Peer Reviewed
  • [Journal Article] Improved critical current densities in ex-situ processed MgB2 tapes fabricated with chemically treated powder2007

    • Author(s)
      H. Fujii, K. Togano, K. Ozawa
    • Journal Title

      J. Mater. Res 22

      Pages: 1281-1285

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] Effect of SiC addition on the superconductiong properties of MgB2 tapes fabricated through an ex-situ process using chemically treated powder2007

    • Author(s)
      H. Fujii, K. Togano, H. Kumakura, K. Ozawa
    • Journal Title

      Supercond. Sci. Technol 20

      Pages: 579-583

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] "lmproved critical current densities in ex-situ processed MgB_2 tapes fabricatedwitll chemically treated powder"2007

    • Author(s)
      H. Fujii
    • Journal Title

      Journal of Materials Research 22

      Pages: 1281-1285

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] "Effect of SiC addition on the superconducting properties of MgB_2 tapes fabricated through an ex-situ process using chemically treated powder"2007

    • Author(s)
      H. Fujii
    • Journal Title

      Superconductor Science and Technology 20

      Pages: 579-583

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Presentation] Improved critical current densities in ex-situ processed MgB_2 tapes using powders treated in chemical solutions2008

    • Author(s)
      H.Fujii,K.Togano,H.Kumakura and K.Ozawa
    • Organizer
      Materials Research Society
    • Place of Presentation
      Moscone West and San Francisco Marriott,San Francisco,USA
    • Year and Date
      2008-03-25
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Improved critical current densities in ex-situ processed MgB_2 tapes using powders treated in chemical solution2008

    • Author(s)
      H. Fujii, et. al.
    • Organizer
      2008 Materials Research Society Spring Meeting
    • Place of Presentation
      Moscone West and San Francisco Marriott, San Francisco, USA
    • Year and Date
      2008-03-25
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] "Improved critica current densities in ex-situ processed MgB_2 tapes using powderstreated in chemical solutions"2008

    • Author(s)
      Hiroki Fuju
    • Organizer
      Materials Research Society 2008 Spring Meeting
    • Place of Presentation
      Moswne West andSan Francisco Marriott
    • Year and Date
      2008-03-25
    • Related Report
      2007 Annual Research Report
  • [Presentation] 化学処理した粉を用いて作製したex-situ法MgB_2線材の粒間結合と臨界電流密度2007

    • Author(s)
      藤井宏樹、戸叶一正、熊倉浩明、小澤清
    • Organizer
      低温工学協会
    • Place of Presentation
      宮城県民会館
    • Year and Date
      2007-11-20
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Grain coupling and critical current density in ex-situ processed MgB_2 tapes using chemically treated powder2007

    • Author(s)
      H. Fujii, et. al.
    • Organizer
      Cryogenic Association of Japan 2007 Fall Annual Meeting
    • Place of Presentation
      Miyagi Kennmin Kaikan
    • Year and Date
      2007-11-20
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] 「化学処理した粉を用いて作製したex-situ法MgB_2線材の粒間結合と臨界電流密度」2007

    • Author(s)
      藤井 宏樹
    • Organizer
      2007年秋季低温工学・超電導学会
    • Place of Presentation
      宮城県民会館
    • Year and Date
      2007-11-20
    • Related Report
      2007 Annual Research Report
  • [Presentation] 化学処理したMgB_2粉の使用とSiC添加によるex-situ法MgB_2超伝導線材のJ_c向上2007

    • Author(s)
      藤井宏樹、戸叶一正、熊倉浩明、小澤清
    • Organizer
      日本金属学会
    • Place of Presentation
      岐阜大学
    • Year and Date
      2007-09-19
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] 化学処理したMgB_2粉の使用とSiC添加によるex-situ法MgB2超伝導線材のJ_c向上2007

    • Author(s)
      藤井 宏樹
    • Organizer
      日本金属学会2007年秋期大会
    • Place of Presentation
      岐阜大学
    • Year and Date
      2007-09-19
    • Related Report
      2007 Annual Research Report
  • [Presentation] 化学処理した粉を用いて作製したex-situ法によるMgB_2線材の超伝導特性2007

    • Author(s)
      藤井宏樹、戸叶一正、熊倉浩明、小澤清
    • Organizer
      低温工学協会
    • Place of Presentation
      千葉大学
    • Year and Date
      2007-05-16
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] 「化学処理した粉を用いて作製したex-situ法によるMgB_2線材の超伝導特性」2007

    • Author(s)
      藤井 宏樹
    • Organizer
      2007年春季低温工学・超電導学会
    • Place of Presentation
      千葉大学
    • Year and Date
      2007-05-16
    • Related Report
      2007 Annual Research Report
  • [Presentation] 化学処理した粉を用いてex-situ法で作製したMgB_2超伝導線の特性2007

    • Author(s)
      藤井宏樹、戸叶一正、熊倉浩明、小澤清
    • Organizer
      日本金属学会
    • Place of Presentation
      千葉工業大学
    • Year and Date
      2007-03-28
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Properties of ex-situ processed MgB_2 superconducting tapes using chemically treated powder2007

    • Author(s)
      H. Fujii, et. al.
    • Organizer
      The Japan Institute of Metals 2007 Spring Annual meeting
    • Place of Presentation
      Chiba Institute of Technology
    • Year and Date
      2007-03-28
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Improvement in Jc of ex-situ processed MgB_2 superconducting tapes by using chemically treated MgB_2 powder and SiC addition2007

    • Author(s)
      H. Fujii, et. al.
    • Organizer
      The Japan Institute of Metals 2007 Fall Annual Meeting
    • Place of Presentation
      Gifu University
    • Year and Date
      2007-03-19
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Superconducting properties of MgB_2 tapes fabricated through an ex-situ process using chemically treated powder2007

    • Author(s)
      H. Fujii, et. al.
    • Organizer
      Cryogenic Association of Japan 2007 Spring Annual Meeting
    • Place of Presentation
      Chiba University
    • Year and Date
      2007-03-16
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] 化学処理した粉を用いて作製したex-situ法によるMgB_2超伝導線材の組織と特性2006

    • Author(s)
      藤井宏樹、戸叶一正、熊倉浩明、小澤清
    • Organizer
      低温工学協会
    • Place of Presentation
      熊本大学
    • Year and Date
      2006-11-20
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Microstructure and properties of MgB_2 superconducting tapes prepared by an ex-situ method using powder with chemical treatment2006

    • Author(s)
      H. Fujii, et. al.
    • Organizer
      Cryogenic Association of Japan 2006 Fall Annual Meeting
    • Place of Presentation
      Kumamoto University
    • Year and Date
      2006-11-20
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary

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Published: 2006-04-01   Modified: 2016-04-21  

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