快脉冲超导磁体用NbTi超导线材的制备研究

发布时间：2018-09-12 06:07

【摘要】：本研究以Cu10Ni合金作为基体材料,采用组装法制备了铜比1.8,Φ0.7 mm的快脉冲超导磁体用NbTi超导线材.研究了Cu10Ni合金、时效次数和最终应变、去应力退火对快脉冲超导磁体用NbTi/Cu超导线微观组织和临界电流密度的影响.实验结果表明:采用Cu10Ni合金作为基体,时效3次且最终应变在3.5-5.0之间时,线材最终应变增大,临界电流密度呈先增大而后降低,最终趋于稳定的变化规律;最终应变为4.37时,随着热处理次数的增加,临界电流密度呈先增大而后降低的趋势,断线次数也随之明显增多.损耗的测试结果表明:采用Cu10Ni合金为基体制备的超导线材的损耗要明显小于无氧铜基体的超导线材.经过3次时效热处理且最终应变为4.37时,Cu10Ni合金为基体制备的超导线材其临界电流密度最高为2308A/mm~2(4.2K,5T,判据0.1μV/cm),损耗为40.8mJ/cm~3,(±3T,4.2K).
[Abstract]:In this study, NbTi superconducting wires for fast pulse superconducting magnets with copper ratio of 1.8 and 桅 0.7 mm were prepared by assembly method using Cu10Ni alloy as substrate. The effects of aging times, final strain and stress removal annealing on the microstructure and critical current density of NbTi/Cu superconductors for fast pulse superconducting magnets were investigated. The experimental results show that when Cu10Ni alloy is used as the matrix, the final strain of wire rod increases, the critical current density increases first, then decreases, and the final strain is 4.37 when the final strain is 3.5-5.0, when the aging time is 3 times, and the final strain is between 3.5-5.0, the critical current density increases first and then decreases, and the final strain is 4.37. With the increase of heat treatment times, the critical current density increases first and then decreases, and the breaking times increase obviously. The results show that the loss of superconducting wire prepared by Cu10Ni alloy is obviously lower than that of copper without oxygen. The critical current density of superconducting wire prepared by three aging heat treatment and final strain 4.37 is 2308A/mm~2 (4.2kg ~ 5T, criterion 0.1 渭 V/cm), and the loss is 40.8mJ / cm ~ (-3), (卤3T ~ (4.2K).
【作者单位】：西安欧中材料科技有限公司;西部超导材料科技股份有限公司;西北有色金属研究院;
【基金】：国家国际科技合作专项项目(2015DFR50010)资助的课题~~
【分类号】：TM26

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