摘要
超导磁悬浮力(→F)是YBCO超导块材应用研究的重要性能参数之一。影响其值大小的因素不仅与超导体的临界电流密度(J)c、超导块的直径(r)和永磁体在超导体附近磁场梯度(dH/dZ)有关,也与测试方法有密切的联系。本研究测试了磁浮力与磁铁和样品的间距及磁浮力随保留时间的变化曲线。实验结果表明,磁铁在距样品5mm停留时,磁浮力随着保留时间的延长总的变化趋势是降低的,但逐渐趋于稳定,在30min后,样品磁浮力每10min内衰减率小于1%。
Levitation force is one of important parameters in the applied research of YBCO bulk superconductor. The value of levitation is affected not only by the properties of the superconductor （Jc, r, dH/dZ） but also by the experimental conditions in the measurement process. In this paper, two YBCO bulk superconductors have been selected to investigate the trend curve of levitation force with distance and holding time. It is found that the levitation force degenerates with time, but attenuation trends toward stabilization gradually. After holded 30 min, attenuation rate of the levitation force is less than 1% every 10 min.
出处
《稀有金属快报》
CSCD
2006年第10期22-26,共5页
Rare Metals Letters
关键词
YBCO超导体
磁浮力
衰减率
YBCO superconductor
levitation force
attenuation rate
