Reduction of the Matrix Ratio for Improvement of the Non-Cu $J_{\rm c}$ of ${\rm Nb}_{3}{\rm Al}$ Wires
| Autor: | K. Tagawa, Akihiro Kikuchi, Takao Takeuchi, Nobuya Banno, Yasuo Iijima |
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| Rok vydání: | 2008 |
| Předmět: |
Materials science
business.product_category Annealing (metallurgy) Niobium chemistry.chemical_element Condensed Matter Physics Electronic Optical and Magnetic Materials chemistry Rapid thermal processing Die (manufacturing) Critical current Adhesive Electrical and Electronic Engineering Composite material business Type-II superconductor Electrical conductor |
| Zdroj: | IEEE Transactions on Applied Superconductivity. 18:1035-1038 |
| ISSN: | 1558-2515 1051-8223 |
| Popis: | We attempted to reduce the matrix ratio down to 0.5 and 0.25 for RHQT (rapid-heating, quenching and transformation) Nb3Al wires, which is directly related to improvement of the non-Cu Jc. The Ta matrix was chosen to improve the wire strength. It was found that the matrix ratio of 0.25 is too small to carry out RHQ treatment although drawing was possible by using cassette-roller dies (CRDs) as well as conical dies. The reduction of the matrix ratio down to 0.5 can also be achieved. However, the scale-up would make the drawing very difficult. It would be necessary for the scale-up to improve adhesion among the jelly-roll (JR) cores and also the outer Ta sheath in the multi-billet. The RHQ treatment was possible for the wire with a matrix ratio of 0.5. However, it was successful only when the wire diameter was less than 1.13 mm. It is necessary to suppress the experienced bend strain in the operation. The non-Cu Jc was found to be improved by about 20% by the reduction of the matrix ratio, compared to conventional Nb3Al wires. |
| Databáze: | OpenAIRE |
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