Abstract
The engineering applications of high temperature superconducting (HTS) single domain YBCO block require the material with larger size and more complex shape. However, traditional top-seeded melt growth (TSMG) method cannot meet this requirement. In this paper, solder technology of YBCO blocks using Ag 2O-doped YBCO slice has been performed in air with a rapid cooling rate, and the oxygen treatment techniques with a shorter time were used in the process. Microstructure analysis and superconducting characterization of the joint were investigated. The results show that a high quality joint is obtained without any macro cracks. Furthermore, the grains in the joint are well oriented as same as that of the base YBCO block. However, some defects such as voids and Cu–Ba–O phase segregations are discovered in the middle of the joint. Much finer Y211 (Y 2BaCuO 5) grains are attained in the soldering zone compared with that in the base YBCO. The trapped field measurement on bonded YBCO blocks shows a single maximum, indicating good superconducting properties in the joint.
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