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采用自耗电弧炉水冷铜结晶器熔制Cu-Nb合金,获得较为均匀的Nb相枝晶铸锭。铸绽经热锻开坯,随后加工成Cu-Nb合金管,在管芯穿入Sn-Cu芯棒,将Cu-Nb-Sn复合组件冷拉成直径0.03厘米线材。Nb相枝晶纤维化良好,经过550℃、168小时反应热处理,临界电流密度J-e达到峰值,其中Nb_3Sn的临界电流密度在5T时达到1.0×10~6安/厘米~2;用电阻法测量了临界转变温度T_c,发现复合线包含有T_c分别为7.33K 8.50K、16.37K的三个超导相。
Cu-Nb alloy was melted by self-consumption arc furnace water-cooled copper mold to obtain more uniform Nb-phase dendrite ingot. Cast bloom by hot forging billet, and then processed into Cu-Nb alloy tube, the core penetrated into the Sn-Cu mandrel, the Cu-Nb-Sn composite components cold drawn into a diameter of 0.03 cm wire. Nb phase dendritic fiber is well-formed, and the critical current density Je reaches its peak after 550 ℃ and 168 hours reaction heat treatment. The critical current density of Nb3Sn reaches 1.0 × 10-6 A / cm2 at 5T; Critical transition temperature T_c, found that the composite line contains T_c respectively 7.33K 8.50K, 16.37K three superconducting phase.