Abstract
Wires in which Bi2Sr2Ca1Cu2O8 (Bi-2212) and Ag layers were alternately coated on Ag tape were prepared by the dipping method. In order to increase the Jc value of wires, conditions of heating processes I and II were investigated. When heating I was made in the condition where holding temperature inducing a partial melting of the Bi-2212 phase was 887°C and cooling rate was 5°C /h and heating II was carried out at 850°C, the Jc value was improved intensively. It has been found that laminating Ag on the Bi-2212 layer and reducing the oxygen partial pressure of flowing gas are effective to increace the Jc value. A wire with a maximum Jc value of 1.8xl04A/cm2 (at4.2 K in 1T) was prepared, and overall critical current (Ic) was increased to more than 300A. which was measured by double stacking the Bi-2212 and Ag layers at 4.2K in magnetic field of 1T.
