Recent Developments and Future Prospect of MgB2 Wires and Tapes
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- Matsumoto Akiyoshi
- National Institute for Materials Science
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- Kumakura Hiroaki
- National Institute for Materials Science
Bibliographic Information
- Other Title
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- MgB2 超伝導線材の開発と将来展望
- MgB2 チョウデンドウ センザイ ノ カイハツ ト ショウライ テンボウ
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Abstract
MgB2 wires are now fabricated by two (in situ and ex situ) powder-in-tube (PIT) methods. The superconducting properties of PIT-processed MgB2 wires are sensitive to the quality of the starting powder in both methods, the heat-treatment temperature, the porosity of the MgB2 core, and impurity additions. In the case of the in situ method, a sub-micrometer Mg starting powder is quite effective for enhancing Jc. Some kinds of carbon compound additions to the starting powder introduce a carbon substitution for boron in MgB2 crystal and enhance both Bc2 and Jc in high magnetic fields. In general, ex situ-processed MgB2 wires show lower Jc than in situ-processed wires. The key factor to obtain a high Jc for an ex situ tape is also the high quality of the MgB2 starting powder. Recently, we succeeded in the fabrication of high Jc ex situ MgB2/Fe wires using MgB2 cores removed from in situ MgB2 wires. Al-sheathed ex situ-processed wires are interesting due to their light weight and the high thermal stability of conductor. At the present stage, however, Jc values of MgB2 wires are still below a practical level. Further improvement of the processing of MgB2 wires is essential in order to obtain a practical level of Jc values.<br>
Journal
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- Journal of the Japan Institute of Metals and Materials
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Journal of the Japan Institute of Metals and Materials 71 (11), 928-933, 2007
The Japan Institute of Metals and Materials
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Details 詳細情報について
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- CRID
- 1390282681455905152
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- NII Article ID
- 10019788687
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- NII Book ID
- AN00187860
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- ISSN
- 18806880
- 24337501
- 00214876
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- NDL BIB ID
- 9263037
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
- KAKEN
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- Abstract License Flag
- Disallowed