Development of AgMg Alloy Sheathed Bi-2223 Multifilamentary Tape

Effects of complex processings on critical current density of Bi-2223 tapes

“…The bending strain dependence of J c was also studied by I c measurement in the bent tape. From these tests, as shown in figure 3, a dramatic improvement by a factor of more than 2 in the tensile stress dependence of J c on the basis of pre-strain effects was confirmed, and tensile results were fitted with the rule of mixtures [4].…”

“…The critical current densities of the tapes were measured by the standard fourprobe technique and were of the order of 20 kA cm −2 . The criteria for J c were 1 µV cm −1 for short samples and 10 −13 m for long ones over 10 m. As an approach to the enhancement of mechanical strength, a silver-0.2 wt% magnesium alloy was applied to form the outer sheath [4]. As an approach to decreasing the AC loss, twisted tapes with pitches of 4-21 mm were made, and J c values and AC losses were evaluated [5].…”

“…Figure 1 shows local J c distributions derived through the E-J analysis of long-length tapes, which are each categorized into 10 kA cm −2 , 20 kA cm −2 and 30 kA cm −2 classes of J c , together with the Weibull analysis [4]. The 30 kA cm −2 wire shows a broad or flat J c distribution, and the J c distribution even reaches 60 kA cm −2 , as a consequence decreasing the n value.…”