Ag/Bi2223高温酸化物超電導テープのPb-Snハンダによる接続抵抗

概要

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Studies have been made on electric resistance of PtrSn soldered junction between silver-sheathed Bi_2Sr_2Ca_2Cu_3O_x (Bi2223) tapes which are typical high temperature superconductor. Junction resistance has been obtained decay of persistent current in the circuit which consists of superconducting coil and soldered junction. Junction resistance decreases approximately in inverse proportion to junction length. However, when junction length is longer resistance becomes slightly larger. This result is considered that when junction length is short thickness of solder layer is thin and uniform, but junction length is long uniformity of solder layer thickness is lost. These results have been confirmed by the cross-sectional photograph of soldered junction observed from EPMA.
福井工業大学の論文