4.超伝導導体 : 4.2高温酸化物超伝導導体(<講座>超伝導技術III)

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Since new La-Ba-Cu-O oxide high-T_e Superconductors were discovered in 1986, there were reports of Y-Ba-Cu-O superconductor with T_e in the 90-K class, followed by a 110-K class Bi-Sr-Ca-Cu-O superconductor and a 125-K class Tl-Ba-Ca-Cu-O superconductor. Many processing technologies have been investigated to develop oxide superconducting wire, including solid reaction process, Iiquidus process and film process. Towards practical applications, they should be long, and should carry high critical current density, at least 10,000A/cm^2 under relevant magnetic field, and should not be strain-sensitive. At present, a 1,000-m class long wir.e was achieved using bismuth-based oxide and silver-sheathing processing technology. Critical current densities of oxide superconducting wires have been improved. Multifilamentary wires proved to have good strain resistant properties. Prototypes for practical applications have been fabricated using oxide superconducting wires. Among these applications, two categories were proved to be promising. The first one is large current conductor application, such as current leads for magnets, bus bars and power transmission cables. The second one is magnet application. Since oxide superconductors have a wide critical surface, we expect that these magnets can be used under a variety of cooling conditions with different coolants, such as helium, hydrogen, neon, nitrogen and refrigerators.
社団法人プラズマ・核融合学会の論文
1994-10-25

4.超伝導導体 : 4.2高温酸化物超伝導導体(<講座>超伝導技術III)

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