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十多年来,人们一直在研究和应用NbTi 合金超导材料;但最重要的是人们注意到了 NbTi 标准成分种类繁多的情况。低钛合金是英国帝国金属工业公司的 NbTi44;标准的美国合金是 NbTi46.5;西德的合金为 NbTi50。±2%的标准偏差几乎是一致的。高钛合金的含钛量为53—55%。众所周知,NbTi40—NbTi50合金的Tc 为9～9.3°K,4.2°K 时的 H_(c2)最高值为11万高斯。商用 NbTi 合金的 H_(c2)值如下表所示(万高斯):据报导,现在商用细芯(10微米以上)NbTi 合金复合超导体的临界电流密度一般
For more than a decade, people have been studying and using NbTi alloy superconducting materials; but above all, people have noticed a wide variety of NbTi standard compositions. The low titanium alloy is NbTi44 from Imperial Chemical Industries of the United Kingdom; the standard American alloy is NbTi46.5; the West German alloy is NbTi50. The standard deviation of ± 2% is almost identical. Titanium high titanium content of 53-55%. It is well-known that the Tc of NbTi40-NbTi50 alloy is 9 ~ 9.3 ° K, and the highest value of H_ (c2) at 4.2 ° K is 110,000 Gauss. The H_ (c2) values of commercially available NbTi alloys are shown in the following table (million gauss): It is reported that the critical current density of commercial fine-core (10 μm or more) NbTi alloy composite superconductors is now generally