采用顶部熔融织构生长法制备的高温超导块材YBCO通常有5个生长区域．通过捕获磁通实验研究，人们发现高温超导块材内部生长区域及边界的捕获磁通能力不同，存在明显的各向异性．面向高温超导磁悬浮应用，本文比较研究了3块不同的高温超导块材YBCO组合在永磁轨道上方悬浮力弛豫特性．实验结果表明，无论场冷还是零场冷情况，块材籽晶生长线对齐排列方式的悬浮力衰减率均小于块材籽晶生长线错开排列方式的悬浮力衰减率，即前者的弛豫特性较好．并且在排列方式相同的情况下，场冷情况下的悬浮力衰减率小于零场冷情况下的悬浮力衰减率，场冷情况下的弛豫特性较好．因此，在未来的实际应用中可通过合理选择高温超导块材排列方式以及冷却方法，以达到提高磁悬浮系统弛豫特性的目的，从而提高磁悬浮系统的稳定性能．
The melt-texturing processed bulk high temperature superconductor （HTSC） YBCO has five growth sections in each of the sample generally. By the trapped field experiments, it was known that the bulk HTSC shows the obvious anisotropy property. The capability of trapping fields of the bulk HTSC YBCO is different at each growth section and each boundary. Considering the application of the high temperature superconducting Maglev, the levitation relaxation performances of the different three-bulk HTSC arrays above the permanent magnet guideway （PMG） are discussed. According to the experimental results, the relaxation rate of levitation force show smaller if the crystal growth section boundary obeys the aligned growth section boundary arrangement （AGSBA） pattern rath- er than the misaligned growth section boundary arrangement （MGSBA） pattern, no matter at field cooling （FC） condition or zero field cooling （ZFC） condition. It implies the former levitation relaxation performance is better. The further study shows the relaxation rate of levitation force is smaller with the same pattern at the FC condition than that at the ZFC condition. The relaxation performance is better at the FC condition for the HTS Maglev application. It can be a good improvement option to arrange reasonably each onboard YBCO bulk position and the field cooling height for the better relaxation performance of the Maglev system as well as its better stability performance.
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