(Nb,Ti)/sub 3/Sn superconducting wire reinforced with Nb-Ti-Cu compound
(Nb,Ti)/sub 3/Sn superconducting wire reinforced with Nb-Ti-Cu compound
复制标题
Nb-Ti-Cu化合物增强(Nb,Ti)/sub 3/Sn超导线材
DOI：
10.1109/77.828402
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发表时间：
2000
影响因子：
1.8
通讯作者：
M. Ikeda
中科院分区：
文献类型：
--
作者：
H. Sakamoto;M. Higuchi;S. Endoh;Y. Nagasu;A. Kimura;K. Wada;S. Meguro;M. Ikeda
由于Nb/sub 3/Sn超导体对机械应变非常敏感，当绝对应变大于0.3%时，其临界电流急剧下降，因此需要对Nb/sub 3/Sn超导线材进行增强。近年来，钽、Cu Nb合金和Al/sub 2/O/sub 3/-弥散铜增强的Nb/sub 3/Sn超导线材已得到发展。但是，这些高强度线材在0.3%的绝对应变下没有显示出非常高的强度，因为这些增强材料具有与铜相似的杨氏模量。此外，这些线材的Nb/sub 3/Sn层经历由增强材料和Nb/sub 3/Sn层之间的热收缩差异引起的附加压缩应变。这种压缩应变也降低了导线的临界电流。选择金属间化合物作为Nb/sub 3/Sn超导线材的增强体，因为预期这种化合物具有高杨氏模量和与Nb/sub 3/Sn化合物类似的热收缩。Nb/sub 3/Sn复合层在反应热处理过程中可由Nb Ti和Cu形成Nb Ti Cu化合物。制备了Nb-Ti-Cu复合增强的（Nb，Ti）/sub 3/Sn超导线材。该导线显示出400 MPa的0.2%屈服应力，并保持与未增强导线相等的临界电流密度。
Reinforcement of Nb/sub 3/Sn wires is required for high field superconducting magnets because the Nb/sub 3/Sn superconductor is very sensitive to mechanical strain and its critical current degrades drastically at a higher absolute strain than 0.3%. Recently, Nb/sub 3/Sn superconducting wires reinforced with tantalum, Cu-Nb alloy and Al/sub 2/O/sub 3/-dispersed copper, have been developed. But, these high-strength wires do not show very high strength at an absolute strain of 0.3% because these reinforcements have a similar Young's modulus to copper. In addition, Nb/sub 3/Sn layers of these wires experience an additional compressive strain caused by the differences in thermal contraction between reinforcements and Nb/sub 3/Sn layers. Such a compressive strain also decreases the critical current of the wire. An intermetallic compound was selected as a reinforcement for Nb/sub 3/Sn superconducting wire because such a compound is expected to have a high Young's modulus and a similar thermal contraction to the Nb/sub 3/Sn compound. Fortunately, the Nb-Ti-Cu compound can be formed from the Nb-Ti and copper composite during reaction heat treatment for Nb/sub 3/Sn layers. Therefore, (Nb,Ti)/sub 3/Sn superconducting wire reinforced with the Nb-Ti-Cu compound has been fabricated. The wire shows a 0.2% proof stress of 400 MPa and maintains a critical current density equal to the unreinforced wire.