Abstract We recently suggested a joint method by using incongruent melting for high-temperature superconducting (HTS) wires, such as joint between RE123-coated conductors and between Bi2223 multi-filamentary tapes. It is important to obtain a suitable mechanical performance in joint to develop a persistent current HTS magnet, and this joint method with the melting is considered to have a higher tensile strength than the solid diffusion. In this study, the tensile strength of such a joint at critical current under tension was investigated toward application in a HTS magnet, such as Bi2223-NMR. We prepared two types of lap joint samples between RE123-coated conductors and between Bi2223 multi-filamentary tapes, with wrapping Ni sheets on junction (joined part in joint sample). The critical current of the samples was a similar value about 15 A at 77 K. The Ic of the samples showed a dependence on a small tension of junction below 40 MPa. With the reinforcement effect of the Ni sheet, the tensile stress tolerance of both joints that Ic of joint is reversible was higher than 90 MPa.

中文翻译：

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非一致熔化制备的高温超导接头的抗拉强度

摘要 我们最近提出了一种对高温超导 (HTS) 导线使用不一致熔化的连接方法，例如 RE123 涂层导体之间和 Bi2223 多丝带之间的连接。重要的是要在接头中获得合适的机械性能以开发持续电流 HTS 磁体，并且这种熔化的接头方法被认为具有比固体扩散更高的抗拉强度。在这项研究中，研究了这种接头在张力作用下在临界电流下的拉伸强度，以应用于 HTS 磁体，例如 Bi2223-NMR。我们在 RE123 涂层导体之间和 Bi2223 复丝带之间制备了两种类型的搭接接头样品，并在连接处包裹 Ni 片（接头样品中的连接部分）。样品的临界电流在 77 K 时约为 15 A。样品的 Ic 显示出对低于 40 MPa 的小结点张力的依赖性。在Ni片的加固作用下，接头Ic可逆的两个接头的拉伸应力耐受性均高于90 MPa。