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高性能内锡法Nb3Sn超导股线可用于国际热核聚变反应堆(ITER)磁体,股线加工过程中的断线问题是股线制备的关键技术之一.在股线的Sn组元中添加适量的Ti不但能够提高Sn的强度利于股线的长线加工;同时Ti元素的添加还可以提高热处理中Nb3Sn的成相速度,降低晶粒尺寸,提高股线的电磁特性.本文介绍了满足Nb3Sn超导股线制备要求的Sn-Ti合金的制备技术,分析了不同浇铸温度对铸锭的影响,对比了加工中Sn-Ti合金的微观组织变化,为我们制备满足ITER要求的Nb3Sn超导股线提供了重要的保障.
High-performance inner tin method Nb3Sn superconducting strands can be used in the ITER magnet, wire breakage problem is one of the key technologies in the preparation of strands. The appropriate amount of Ti can not only improve the strength of Sn, but also increase the long-term processing of the strands. Meanwhile, the addition of Ti can also increase the phase velocity of Nb3Sn during heat treatment, reduce the grain size and improve the electromagnetic properties of the strands.In this paper, The preparation technology of Sn-Ti alloy required for wire preparation was analyzed. The influence of different casting temperature on ingot was analyzed. The microstructure changes of Sn-Ti alloy during processing were compared. The preparation of Nb3Sn superconducting strands Provide an important guarantee.