Critical current performance of Bi-2223 HTS tape in temperature range above liquid nitrogen vaporization temperature

Abstract

<p indent=0mm>(Bi, Pb)₂Sr₂Ca₂Cu₃O₁₀ (Bi-2223) high temperature superconducting (HTS) tape is one of the high temperature superconducting wires for commercial applications recently. Its superconducting critical transition temperature is <sc>105–110 K,</sc> which is higher than that of another commercially coated HTS REBa₂Cu₃O₇ conductor tape <sc>(90–93 K).</sc> The Bi-2223 tape has a wide range of superconducting temperatures above the vaporization temperature of liquid nitrogen <sc>(77 K).</sc> The critical currents of two Bi-2223 tape specimens were systematically calculated, and the findings evaluated to understand the superconductive current-carrying characteristics of Bi-2223 tape in the temperature range above <sc>77 K.</sc> To research their effects on the critical current of the specimens in this temperature range, we applied magnetic fields of different intensities and angles to the specimens. The results of the measurement are recorded in this paper in the temperature range of <sc>77–92 K,</sc> the magnetic field strength range of <sc>0–0.2 T</sc> and the magnetic field angle range of 0°–90°. The results show that the Bi-2223 tape can still bear the practical significance of the superconducting current at <sc>92 K.</sc> If there is no external magnetic field, or the external magnetic field is almost parallel to the HTS tape surface and weaker than <sc>0.1 T,</sc> the critical current in the self-field can still sustain 40%–50% of its critical current at <sc>77 K.</sc> For example, the results of this study have a significant reference price for its use in this temperature range, providing basic information for the creation of cable applications that are superconductive.