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我们研究出一种高速而经济的制备极薄多层优质Nb_3Sn超导带的化学气相沉积技术。采用这种新技术,使生产商用Nb_3Sn带(宽约2.5毫米)的带速提高到50～100米/时,短样品的临界电流与临界电流密度分别达到600～780安和1.4～1.6×10~6安/厘米~2(4.2k,4～5万高斯)。长1000米左右的单根长带,经绕成内径为18毫米、高约100毫米的磁体后,在4,2k下载流150～180安,产生10万高斯左右的磁埸,相应的Nb_3Sn层、整个导体和磁体的平均电流密度分别达到3～5×10~5安/厘米~2、4～5×10~4安/厘米~2和2.5～2.9×10~4安/厘米~2。
We have developed a high-speed and economical chemical vapor deposition technique for the fabrication of ultra-thin, multi-layered Nb 3 Sn superconducting tapes. With this new technology, the critical current and critical current density of short samples can reach 600 ~ 780 A and 1.4 ~ 1.6 × 10, respectively, when the manufacturer increases the belt speed of Nb_3Sn belt (width about 2.5mm) to 50 ~ 100m / ~ 6 A / cm ~ 2 (4.2k, 4 ~ 50,000 gauss). A single long strip of about 1000 meters in length, wound around a diameter of 18 mm, a height of about 100 mm magnet, the flow in the 4,2k download 150 ~ 180 security, resulting in about 100000 Gauss magnetic 埸, the corresponding Nb_3Sn layer , The average current density of the whole conductor and the magnet respectively reaches 3~5 × 10 -5 A / cm~2,4~5 × 10 -4 A / cm~2 and 2.5~2.9 × 10 -4 A / cm~2.