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Etude de l'optimisation et de la cinétique de formation de conducteurs supraconducteurs Nb3Sn obtenus par la méthode de l'étain interne

Abstract : Superconductors Nb3Sn wires are one of the most applicable cryogenic superconducting materials and the best choice for high-field magnets exceeding 10T. One of the most significant utilization is the ITER project which is regarded as the hope of future energy source. The high-Cu composite designs with smaller number of sub-element and non-reactive diffusion barrier, and the RRP (Restacked Rod Process) internal-Sn technology are usually applied for the wire manufacturing. Such designed and processed wires were supplied by MSA/Alstom and WST/NIN in this research. The systematic investigation on internal-Sn superconducting wires includes the optimization of HT conditions, phase formation and its relation with superconductivity, microstructure analysis, and the phase formation kinetics. Because of the anfractuosity of the configuration design and metallurgical processing, the MF wires are not sufficient for studying a sole factor effect on superconductivity. Therefore, four sets of ME wires with different Sn ratios and different third-element addition were designed and fabricated in order to explore the relationship between phase formation and superconducting performances, particularly the A15 layer growth kinetics. Different characterization technics have been used (magnetization measurements, neutron diffraction and SEM/TEM/EDX analysis)
The A15 layer thicknesses of various ME samples were measured and carried out linear and non-linear fits by means of two model equations. The results have clearly demonstrated that the phase formation kinetics of Nb3Sn solid-state reaction is in accordance with an n power relation and the n value is increased with the increase of HT temperature and the Sn ratio in the wire composite.
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Submitted on : Wednesday, October 10, 2007 - 10:40:48 AM
Last modification on : Tuesday, November 24, 2020 - 4:56:03 PM
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  • HAL Id : tel-00178091, version 1




Chaowu Zhang. Etude de l'optimisation et de la cinétique de formation de conducteurs supraconducteurs Nb3Sn obtenus par la méthode de l'étain interne. Supraconductivité [cond-mat.supr-con]. Université Joseph-Fourier - Grenoble I; Shaanxi University of Science and Technology, Xi'an, China, 2007. Français. ⟨tel-00178091⟩



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