批量化制备高性能单畴YBCO超导块

用顶部籽晶熔融织构生长法（TSMTG）批量制备了30mm直径的YBCO单畴超导块材，使用一种六面控温的箱式炉和一台改进的坩埚炉进行晶体生长，采用了高压氧化退火工艺对生长出的YBCO晶体进行后处理，与流动氧化工艺相比，在保持样品超导性能不变的情况下高压氧化大大节约了用氧量，缩短了氧化退火时间，提高了生产效率，大多数单畴超导块在77k和0.5T的磁场下的磁悬浮力超过10N/cm^2，其中最高值达到了15N/cm^2，目前我们巳具备了年生产1000块30mm直径优质单畴导块的能力。

BATCH PROCESS OF SINGLE DOMAIN YBCO BULK SUPERCONDUCTORS

The single domain YBCO superconducting disks up to 30mm in diameter have been prepared by the top seeded melting texture growth method in batch process. We have used a box furnace and a crucible furnace in this study. A high oxygen pressure annealing also has been used in the process. In comparison with the flowing oxygen annealing, the capacity of oxygen can be saved and the productivity is raised greatly. As a result, the samples show excellent superconducting properties. The proportion of the samples with levitation force of above 10N/cm+2 to the total is 85%, and for the best smples the levitation force is approximately 15N/cm+2 under the conditions of 77K and 0.5Tesla. We also described the methods to characterize the melt textured YBCO bulk samples. At present, we can produce and provide more than 1000 pieces of the single domain YBCO disks with 30mm in diameter per year.