低温工学
Online ISSN : 1880-0408
Print ISSN : 0389-2441
ISSN-L : 0389-2441
Bi系酸化物超電導体の電流リードへの適用 (第1報)
中間CIP法により作製した100A級バルクの特性
山田 豊柳谷 知之櫻庭 順二石原 守
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1991 年 26 巻 6 号 p. 495-501

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The influence of an intermediate cold isostatic pressing (C. I. P.) on the superconducting properties of Bi-Pb-Sr-Ca-Cu-O superconducting bulk has been investigated, and heat input per a pair of the bulk between 4.2K and 77K has been evaluated. The critical current density (Jc) was improved by the effect of C. I. P. and sintering after initial sintering. The maximum transport Jc at 77K under zero magnetic field was indicated as 580A/cm2, and that at 4.2K under zero magnetic field was indicated as about 3, 500A/cm2. The reasons for these improvements are the formation of the high Tc single phase with a fraction of low Tc phase and the higher density increasing of microstructure. The heat input per a pair of the bulk between 4.2K and 77K has been indicated to be about 60mW and also considered to be of nearly one-third lower than the level of 100A DC condition for the optimum designed current leads with helium vapor cooling.

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