Development of high performance MgB2 wires by Mg diffusion method
| Project/Area Number |
21560764
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Material processing/treatments
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| Research Institution | National Institute for Materials Science |
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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)
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| 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)
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| Project Period (FY) |
2009 – 2011
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| Project Status |
Completed (Fiscal Year 2011)
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| Budget Amount *help |
¥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)
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| 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 |
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| 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.
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Report
(4 results)
Research Products
(26 results)
