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首页> 外文会议>International Advanced School 'Leonardo Da Vinci' on Superconducting Materials: Advances in Technology and Applications, 1998 Summer Course, Bologna-Italy >Low-J_c applications of high-T_c superconductors
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Low-J_c applications of high-T_c superconductors

机译：高T_c超导体的低J_c应用

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摘要

Several low critical-current applications of high-T_c superconductors (HTS) are possible, some of which already have industrial potential. Three of them are presented, which make use of YBCO or BiSCCO extended thick (>50 mu m) films sprayed on metallic substrates by means of the HVOF thermal spray technique. The more extensively studied, so far, is magnetic shielding for cancellation of the magnetic field inside enclosures. With a single layer, attenuation factors of the external magnetic field greater than 10~4 are obtained for static magnetic fields, much better than using multiple layers of conventional high-permeability materials. The maximum shielded field of approx approx 1 centre dot 10~(-4) T can easily be improved to approx approx 0.1 T by using a secondary shield made of low-cost ferromagnetic materials. A second application, under development, is thermal shielding, taking advantage of the fact that be-low T_c a superconducting surface reflects most of the thermal radiation. Heat transfer can be reduced to levels comparable with those obtained with the best multilayer insulation techniques. A third application is for magnet current leads, with currents < approx approx 100 A. In this case, the powder-in-tube technique or the use of bulk materials is exceedingly costly and the current density provided by these techniques needlessly high. The use of low-conductivity metal strips coated with superconducting thick films allows one to better compromise performances and costs. A review of the state-of-the-art is provided and some of the latest results are reported.
机译：高T_c超导体（HTS）的几种低临界电流应用是可能的，其中一些已经具有工业潜力。介绍了其中的三个，它们利用通过HVOF热喷涂技术喷涂在金属基材上的YBCO或BiSCCO延伸的厚膜（> 50微米）。迄今为止，更广泛研究的是用于消除外壳内部磁场的磁屏蔽。对于单层，对于静态磁场，获得的外部磁场衰减因子大于10〜4，比使用多层常规高磁导率材料要好得多。通过使用由低成本铁磁材料制成的次级屏蔽，可以轻松地将大约1个中心点10〜（-4）T的最大屏蔽场提高到大约0.1T。正在开发中的第二个应用是热屏蔽，它利用以下事实：超导表面在T_c之下，反射了大部分热辐射。可以将传热降低到与采用最佳多层绝缘技术获得的水平相当的水平。第三种应用是用于电流小于约100 A的磁体电流引线。在这种情况下，粉管技术或散装材料的使用极其昂贵，并且这些技术提供的电流密度不必要地很高。使用涂有超导厚膜的低电导率金属条可以更好地降低性能和成本。提供了最新技术的回顾，并报告了一些最新结果。

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