Abstract
Ag–Cu alloy sheathed Bi-2212 round wires have been fabricated by the powder-in-tube method. Short samples show critical current ( I c) values of more than 150 A at 4.2 K and 10 T, while I c for a small coil with total length of 10 m reduces to about 30% of the values obtained for short samples. In order to clarify the factors to deteriorate I c for coils, superconducting properties and the microstructures have been examined. The difference in transport I c between short samples and coils can be attributed not to the intrinsic properties of Bi-2212 grains but to the extrinsic limiting factors, such as voids that are formed by the released gases inside the wires with long length during heat treatment.
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