Controlled over-pressure sintering process of Bi2223 wires

Thermal conductivity of single and multi-stacked DI-BSCCO tapes

“…The details of sample preparation have been described elsewhere [1]. Two types of DI-BSCCO tapes (types H and G) were studied.…”

“…The stacked n-fold sample consists of n pieces of tape and (n − 1) layers of solder. Here, we denote the heat flow and the thermal conductivity for the single tape as Q (1) and κ (1) and those for the solder as Q sol and κ sol , respectively. In this configuration, the equivalent circuit is parallel to that of the heat transport.…”

“…where S sol is the sum of cross section for the solder part, i.e., S sol = S (n) − nS (1) . In this case, S sol was estimated to be 0.27 mm 2 (=S (6) − 6 × S (1) ),…”

“…Here, the value of S (6) for the stacked sample of type G tape is calculated by assuming that the S sol value is the same as that for type H6 tape. The estimated κ (6) cal (T ) and measured κ (1) mes for type G tape are shown in Fig. 5(b).…”

“…Sumitomo Electric Industries, Ltd. has developed a new sintering technique with a controlled overpressure (CT-OP) [1], which enables us to fabricate the Bi2223/Ag tape without voids and with an extremely small amount of non-superconducting phases. Recently, using this method, a Bi2223/Ag tape with a high critical current over 200 A at 77 K and under the self-field was successfully manufactured [2].…”