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本文提出了“青铜基体在导体中均匀配置”是提高青铜法多芯Nb_3Sn导体Jc的新观点,相应采用了“一次性青铜分配-两次挤压-拉伸”新工艺。用该工艺研制出了有高载流能力的大截面多芯Nb_3Sn矩形导体,并测定了其超导特性Jc、Tc、Hc2及反应热处理后青铜基体中的残余Sn含量。用这种工艺研制的矩形导体,经700℃,48-168小时反应热处理后,在4.2K,15特斯拉(T)时,其Jc值为1.2×10~4A/cm~2。H_(c2)(4.2K)为19.6-20T,Tc为17.5-17.7K。中国科学院电工研究所,用我们研制的带材(800米),采用先绕后扩散方法绕成的内口径为80毫米的磁体,在4.2K下,与7特斯拉背场磁体组合,产生磁场为11.4特斯拉,猝灭电流为303安,超过了磁体的原设计要求。本研究结果证明,我们提出的新观点是正确的,该新工艺是成功的。
In this paper, we propose a new idea of “uniform distribution of bronze matrix in conductor” to improve Jc of multi-core Nb_3Sn bronze method. Correspondingly, the new technology of “one-time bronze distribution-twice extrusion-stretching” is adopted. A large cross section multi-core Nb_3Sn rectangular conductor with high current carrying capacity was developed by this process. The superconductivity Jc, Tc, Hc2 and the residual Sn content in the bronze matrix after the reaction heat treatment were measured. The rectangular conductor developed by this kind of process has a Jc value of 1.2 × 10-4 A / cm2 at 4.2 K and 15 Tesla after heat treatment at 700 ℃ for 48-168 hours. H_ (c2) (4.2K) is 19.6-20T and Tc is 17.5-17.7K. Institute of Electrical Engineering, Chinese Academy of Sciences, with our developed strip (800 meters), using the first around the diffuser method around the diameter of 80 mm magnet, at 4.2K, with 7 Tesla back field magnet combination produced The magnetic field was 11.4 Tesla with a quenching current of 303 Amps, exceeding the original design requirements of the magnet. The results of this study demonstrate that the new view we put forward is correct and that the new process is successful.