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将Nb片、Ti片、Ta片在Cu包套中按照周期的次序…TiTaNbTaTi…排列,然后通过真空焊封、热等静压、热挤压制成61芯NbTiTa/Cu复合体,对复合体在700、600、500℃进行扩散热处理,最后进行减径加工得到准0.2mm的NbTiTa/Cu超导线材。在500℃扩散处理后,61芯NbTiTa/Cu超导线材在4.2K的临界电流密度(磁场强度)为5290.29A/mm2(3T),3782.14A/mm2(4T),2865.8A/mm2(5T),1882.65 A/mm2(6T),达到国外传统工艺NbTiTa/Cu超导线材临界电流密度的较高水平。在600℃扩散处理的NbTiTa/Cu超导线材的临界电流密度很低,主要是由于扩散温度高,芯丝的成分趋于均匀,从而缺乏α-Ti磁通钉扎中心所致。
The Nb sheet, the Ti sheet and the Ta sheet are arranged in a Cu sheath in a periodic order of ... TiTaNbTaTi ..., and then the 61-core NbTiTa / Cu composite is prepared by vacuum welding, hot isostatic pressing and hot extrusion, Diffusion heat treatment was performed at 700, 600 and 500 ° C, and finally, a reduction work was performed to obtain a 0.2 mm-thick NbTiTa / Cu superconducting wire. After the diffusion treatment at 500 ℃, the critical current density (magnetic field) of 61 core NbTiTa / Cu superconducting wire rod at 52K was 5290.29A / mm2 (3T), 3782.14A / mm2 (4T) and 2865.8A / mm2 , 1882.65 A / mm2 (6T), reaching the higher critical current density of NbTiTa / Cu superconducting wire in foreign countries. The critical current density of NbTiTa / Cu superconducting wire which is diffused at 600 ℃ is very low mainly due to the high diffusion temperature and the composition of the core wire tends to be uniform, which results in the lack of α-Ti flux pinning center.