Enhanced Critical Current Densities in Nb3Sn Superconducting Strands Prepared by Bronze Process
| Autor: | Hou Jing, Gao Huixian, Liu Jianwei, Zhang Pingxiang, Li Jianfeng, Qin Xing, Zhang Ke, Wu Bo, Feng Yong, Liu Xianghong |
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| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Superconductivity Materials science Condensed matter physics chemistry.chemical_element 02 engineering and technology engineering.material 021001 nanoscience & nanotechnology Condensed Matter Physics Microstructure 01 natural sciences Copper Grain size Electronic Optical and Magnetic Materials Protein filament chemistry.chemical_compound Surface-area-to-volume ratio chemistry 0103 physical sciences engineering Electrical and Electronic Engineering Niobium-tin Bronze 0210 nano-technology |
| Zdroj: | IEEE Transactions on Applied Superconductivity. 28:1-4 |
| ISSN: | 1558-2515 1051-8223 |
| Popis: | In the development of Nb3Sn superconducting strands, the improvement of the non-Cu critical current density ( $J_{{\rm{c}}}$ ) has been greatly emphasized. Different Nb3Sn strands were manufactured by the bronze route artificially doped with titanium in bronze. The influences of bronze on Nb volume ratio, filament material, filament diameter, and heat treatment were studied. In this paper, bronze-to-Nb volume ratio affected $J_{{\rm{c}}}$ slightly due to the formation of the Sn shortage and similar Nb3Sn volume after heat treatment. The study of filament diameter indicates that $J_{{\rm{c}}}$ increases largely as the filament diameter reduces for the full reaction. Different heat treatment times at 575 °C, 650 °C, and 675 °C will result in various performances. According to microstructure images, residual Nb core can be seen in each filament. Bigger average grain size will lead to lower $J_{{\rm{c}}}$ . |
| Databáze: | OpenAIRE |
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