| Project/Area Number |
25420696
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Physical properties of metals/Metal-base materials
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| Research Institution | National Institute for Materials Science |
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Principal Investigator |
FUJII Hiroki 国立研究開発法人物質・材料研究機構, 高温超伝導線材グループ, 主席研究員 (80354306)
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| Project Period (FY) |
2013-04-01 – 2017-03-31
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| Project Status |
Completed (Fiscal Year 2016)
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| Budget Amount *help |
¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2015: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2014: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2013: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
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| Keywords | 二硼化マグネシウム / ex situ法線材 / 臨界電流密度特性 / 結晶粒間結合 / MgO層除去 / 高エネルギー粉砕処理 / ピン留め点 / 上部臨界磁界 / 高活性粉末 / 結晶子サイズ / 二硼化マグネシウム線材 / ex situ法 / 強結合 / 不活性ガス雰囲気 / 充填粉精製 / 超伝導線材 / 酸化マグネシウム除去 / 溶液処理 |
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| Outline of Final Research Achievements |
In order to improve grain connectivity in ex situ processed MgB2 conductors,we have made attempt to remove MgO layers on the surface of MgB2 grains. Among three methods,the dissolution in weak acid solutions, reduction by the addition of Ca compounds and mechnical removal through ball milling process, the most effective method was the mechanical removal. Althohgh this method is already studied by several authors, with paying attention to the highly reactive milled powders, the Jc value at 4.2 K and 10 T was doubled and the optimized heat-treatment temerature decreased by more than 100 degree, compared with the previously reported values.
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