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设计并制备四组不同组成的内锡法Nb3Sn单组元线和两组不同结构设计的多芯线.先将所有样品进行210℃/50hr+340℃/25hr的Cu-Sn合金化热处理,接着进行A15相成相热处理.四组单组元线的成相热处理程序是在675oC,700oC和725℃三种温度下热处理100小时和200小时;而两组多芯线的成相热处理程序是在675℃,675℃,700℃和725℃四种温度下热处理128小时和200小时.将所有热处理样品采用X-射线EDS进行A15相组成分布测定,采用SQUID磁化法测定临界温度TC.所得结果表明,经过足够热处理时间后各种内锡法Nb3Sn超导线的最终A15相组成和TC与热处理温度、导线复合体组成和结构设计以及第三元素的合金化掺杂无关,而是由这种扩散与固相反应的机制本质所决定的.
Four groups of Nb3Sn single element wires with different compositions and two groups of multicore wires with different structures were designed and prepared.All the samples were first subjected to Cu-Sn alloying treatment at 210 ℃ / 50hr + 340 ℃ / 25hr, Phase A15 phase heat treatment.The four groups of single-element phase heat treatment process is heat-treated at 675oC, 700oC and 725 ℃ three temperatures for 100 hours and 200 hours; and two groups of multi-core line phase heat treatment process is in 675 ℃, 675 ℃, 700 ℃ and 725 ℃ for 128 hours and 200 hours.All the heat treated samples were measured by X-ray EDS to determine the distribution of A15 phase composition and the SQUID magnetization method to determine the critical temperature TC.The results show that After a sufficient heat treatment time, the final A15 phase composition and TC of the various Sn-containing Nb3Sn superconducting wires are not related to the heat treatment temperature, the composition and structural design of the wire composite and the alloying doping of the third element, The nature of the mechanism of solid-phase reaction decision.