报告题目：电力能源与磁应用的高温超导带材研究进展(Recent Advances in High Temperature Superconductor Tapes for Electric Power and Magnetic Applications)
报 告 人：Venkat Selvamanickam 教授 (美国休斯顿大学)
报告时间：2017年6月26日（周一）9:00
报告地点：校本部G309
邀请人：蔡传兵
报告摘要：
High temperature superconductors (HTS) hold the promise of impacting a large market in diverse applications such as energy, health, military, telecommunication, transportation and research. The challenge has been in developing these brittle ceramic materials in lengths of over a kilometer on flexible substrates with properties similar to that of high quality epitaxial thin films. Novel materials processing has been developed to fabricate superconducting tapes with excellent critical current performance by manipulation of grain orientations and nanoscale defects. HTS tapes are now being manufactured in quantities of few hundred kilometers annually with current carrying capacity of about 400 times that of copper wire of the same cross section.
In the past few of years, tremendous advancements have occurred in nanoscale defect engineering in these thin film superconducting tapes that has led to a quadrupling of critical current performance in high magnetic fields and operating temperatures of interest for various applications. Heavy doping of Zr in (Gd,Y)Ba2Cu3Ox tapes have yielded record high pinning force levels above 1800 GN/m3 at 4.2 K and critical current densities (Jc) above 20 MA/cm2 at 30 K, 3 T in the orientation of field perpendicular to the conductor. An engineering current density of 5300 A/mm2 at 4.2 K, 14 T, which is 4.5 times higher than that of Nb3Sn and 7 times higher than Bi-2212 wires, has been achieved. For AC applications, fully-stabilized, 12- to 48-filament low AC loss HTS tapes with loss reduction up to a factor of 80 have been demonstrated.
An overview of the recent advances in HTS tapes for electric power and magnetic applications will be provided in this presentation.
